CA2703341A1 - Fire safe arrester isolator - Google Patents
Fire safe arrester isolator Download PDFInfo
- Publication number
- CA2703341A1 CA2703341A1 CA2703341A CA2703341A CA2703341A1 CA 2703341 A1 CA2703341 A1 CA 2703341A1 CA 2703341 A CA2703341 A CA 2703341A CA 2703341 A CA2703341 A CA 2703341A CA 2703341 A1 CA2703341 A1 CA 2703341A1
- Authority
- CA
- Canada
- Prior art keywords
- cartridge
- disconnector
- housing
- temperature
- activation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H39/00—Switching devices actuated by an explosion produced within the device and initiated by an electric current
- H01H39/002—Switching devices actuated by an explosion produced within the device and initiated by an electric current provided with a cartridge-magazine
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/14—Means structurally associated with spark gap for protecting it against overload or for disconnecting it in case of failure
Abstract
A housing encapsulating first and second terminals of a surge arrester disconnecter becomes structurally weakened before activation of a disconnect device in the disconnecter when the disconnecter is exposed to heat, thereby preventing the disconnecter from producing a projectile with a force sufficient to classify the disconnecter as a hazardous material under Department of Transportation regulations.
Description
} = .. . .: ISOLATOR
F :: s D OF aME IN\'EN j('N s 000'11 Sae i;w~'e{ltiS.1 : relates generally . i hig x. volt ~ Y i .. _..>
Power generation and t:.a:15:mssion systems, and more specifically to the s .,e transportation r-=.d storage of surgge rr stets having a heat activated disconnector.
R".0021 Electrical power transmission and dis,,tvibution equipment is suljjeet to Voltages ;pith in a t a3rly narrow. range under normal operating conditions, and the e , ip Tent may opi 'a` :e at high -voltages of. for example, I OOOV or greater. However, 53`ste;;a dis wriiaa ces sz.t as ligght 3.in strikes and switching stages the momentary or e tendeyd voltage levels that greatly exceed the v R experienced by equipment during normal operating conditions. These^ oltage va?ri.ations Ãifell are referred to as over--voltage conditiosnns. if not protected from over-voltage.
cà nditio>ns,. crit_ica and expensive equipment, such as transfoimersc, s Ãtch"#_i tg Ã3etiioes, computer eqw :,i and el l p~iei~t, z~ ,t.r.Q~;.: rnach.,rÃry> may be damaged or destroyed by such oL`ei".
voltage conditions and associated i r_,ngl for .. current xt resurges. it is routine practice practice ~.: al?
system designers to use surge arresters to n 3i t.~ d; rem components from dangerous over--volta---e.= conditions, 1UUO31 A surge arrester is a protective device that is t nluri' only Ã=+?a-i> dr'a` in parallel with a comparatively expensive piece of electrical equipment to diert over-voltage-induced current safely around the cc, . t, thereby protecting the equi i7ieni't and its internal L .rc itr . aÃ? Ãic a agc, The surge arrester normal. `
operates ei a high impedance :ode that provides. a low current path to ground having a relatively high ini cc trice, In this aioÃle, normal current at the system "fteclu ncy is directed Cs the le+ ,z =ta equipment and is ire 'r`ent ` t'oi to`low1 1g the surge current to ground long the current. path throÃagh, the surge arrester. When exposed to an.
à 'ei oltag c= >nd#i the S~ S ca tis q,..
ut3>a.~it3iss.i. thsurge, T," ~ a.>:e.4C w~.i' operates .3 in a low iial~3c`iaiii"ii.:~: ia:f3Ct that provides a aA.`+gfh~
current path, to à leictr ical y i.I k: relatively impedance, r e :~ surge arrest _'1 is cap rating in the low-impedance mode, the impedance ofthe rreh +.a t.ialiy tower than the impedance of the equipment b,ng pot Li ': by the s >ge arrester. In this mode, F i3.t.tent. kl:o_i1, the over-voltage condition is directed -to g,~row-jd and not to the electrical equipment Upon completion of the ov Z ita: e conditio7 , the surge a estea returns to operation in the high i?u ance à lode. The surge au-.ester also includes a disconnecto, that disconnects the sursge acres e t t taa ground 'lie over-'~ t..
4'?.
Itcawae' ea`,ii;1t~,<C or, is too extreme or continues too long.
LOOP 4] , iwure .`s a partial cio s-sectÃona view: a cony .nt,.ti:ia~i 'i ag...
voltage surge a,-rroster 90. As illustrated in Fit u the 3 3 t ai e surge arrester 90 ,`icaaiiy includes an elongated outer enclosure or housing 104 Made of :Ã
<fr'ct ically' insu`latin material, a pair of electrical terminals 1Ã02, Ã~?4 at opposite ends of the enclosure 100 for connecting the arrester between, a fine- otentia1 conductor (not 12ti w Ã> an Ci a L ( :F"si3 ~. ruyund (not shim n), respectiv rye and a stack or array of other el'..~.~c+a i .` = ' the ~i.x1 :. a.:oin~~iy"i~..'i~s 106- that, .:?'ail it series electrical path ~3et~~;~ee ~ t~. terminals 102 %-id 104, x erminal stud. 088., 1. .10 connect to the line =1 g-roan 1 t' Ãiifi'i#.i .s, 102 and 1 r specs . re y A- -,a mt s a ateu mou ntmg bracket or hanger xng r 114 also rnay < providod for mounting of the arrester 90 to, for example, another piece of equipment or to a utility po ...
[0005] T e prevent ort circuiting of line Potential conductors connected the surge arrester 90, a d sronndctor 112 is provided on the ground termii stud 110.
The d.Ãsconnectto" 1.12 t nay include an internal resistor or other electrical element connected in parallel . with a spark gap assembly` à nd a 'i1 -=.ià ed; black powder in xi aa3iia.~t>t'3azv~? ~~e_~ .22 caliber i cart-ridge Cxhi " in t to~..4t iativ that is heat '{~ activated, Thus, in .~yw `'=Ti of a ~'t,.:~iw#3 Over-voltage Current flow through the terminal stud y 10, a spark- is generated by the "park, -gap, assembly of the d sconne+ for 112. l- eat from ` s:
the spti_i i~~ :tz`tes .. the .te ~=h c'azed powder cart dge to mechanically sever elects cal cc nn a eio.Ãi between the terminal stud 110 and the low u terminal 104 in the housing 100, thereby isolating the to mfinal stud 110 from the ei ~,n à ii The force R'S STM s'c:. y' of g ti as t i a I1~ C : f 1?G tie A created the <= : -I 333 i,. <ai`4a%d 4' h powder cart >4',~ typically causes the r r terminal stud 110 td arait : .tro the surge arrester 90 thereby effectively isolating à fie tailed attester .fcita the pow r system.
[0006]
i i L li abl i t3 tÃ:t8ta t?i E3ti[ 1i faà 4 :tai 4 e disron e t _ ~' , iiidlu i s'f the terminal stud. -110, can become a projectile when the cartridge. is inadvertenfly exposed to heat during shippin , transit, or storage. During transport and storage, ran accident or otter occurrence results in a iir near one or "'lore arresteers, activation of the chugged 1:,K?wder' cartridges of the disconnecters in the arresters can be hazardous to first responders at the, scene of the fire. Projectiles aitributa#ie to detonation of the c'ha L powder cartridges o she discon lectors, in such fret i> :.iices aru of particular cconeerp. 1,ar ioiiiarly when a large nui ber of ai este`rs with s ch d.isoonnectors are shipped and Stored. A variety of different t+ es of conventional surge arresters `3t disconnectors are vulnerat le to the ` "`r ` similar iiiktwLs above. Additionally, Si~~t3i' problenis may be experienced by all disconnector devices. The Problems noted above r^:it= therefore not consli erect unique to any pat ti ti pit dise iii t ii or to any particular surge arrester.
[0,007-, In light of the ha a rdss posed b--y- arresters when, '~w ~.=
i5bleet~'.a to ~ t o a ', fire Y
shipping, transit, or storager, the United States Department of T twinspo3 nation ()OT) has classified conventional surge arresters as hazardous material; that nmst be u .`n1, r,kL`'.ia ord ance wit;~a DOT hazardous m2<3ti=i"`aCa. a n t as 3ation r = ~g ti '~ ,.
at4~Y. tS.fi..L.=~, ,7 r. z ii~s ii, a ..y ~.`e'i L,i.r1.'~5~.
```.t an ~^ ii~A tii-l yt arresters antd those : L ri it:t tit ~e. :s' i`Yc. f c the cost of such F
i ~ 3 a3> tc#al.?
.'3t..tt.3`l.eiti3'~,~'~, the t4 t t DOT safety regulations few can be met by fitting \ ca~`'areSt` ';~, T~~r'iit3 F~~ akt ti'r:=.ta-ui ,-reveiil i s te i'ia, stud and portions of the disconnactors ft`or.. becoming a ieetiles when the disconnector õarrid is inadvertently exposed to heat during shipping, transit, or storage. Howe ,,er, adding such restraints me easses the cost of Fa'.t't .>=.i's 'i3ititan a)... panZi; 3. to ~ package the a..eesters in Sturdy metallic cases during shippirig, transit, or storage to riieÃ't the D re 3iremel tssthough such packaging may be 3ro`aa ttivel ex einsiv e.
10008-1 Accord i>igiy, a need in the art exists for a surge arrester dffiscoimector t' that of classified as a hazardous material under DOT r-egulations.
SUMMARY THE `NV? ;C IO
[1)009] The invention Provides, a n inexpensive and practical way to prevent the ennina.. studs and other portions of a heat-sensitive arrester discor.,n,ector from becoming Borceiil prÃ` c.-ti?es when the dis on neeto,,r is ex oseda to excessive heat' a' ntaxm shippili#g,,. I-ai 1 7 t9 siii Lt`. i accordance r¾'ittl ozie aspect of t, iii 'a` ili `ion, the terminal studs of the disconn ctoii are encapsulated M. a .oust."i.4, f ts ~. ~,i`isit,~, iir~tt'b_,~.r=a t iat melt or burn at a tea erature that is lower than the ac . atinn temperature of the di.s :oine don's disconnect cartridge. The activation temper.it:tre of the at'tridge is the t is J w,,,ture at which the propellant in the cartridge Ã:e.. Ã1Ãtes. The activation to à 3er rt 2e is sometime . to as the ~~ i "r. if3rà t perat rrd . When the arreste encounters r sit r t r n .~,.
rising wart rah caused by f re during shipping. trans' ? tÃa r: fl ia.1. are aà E r"t, Jv t{dry =g m4tJ.~erl<J.r~K sY `MyIt or away e1 '4c~, e[ .3in k cF ~ re ca -uses a~lita iJtr Jt m eh burn 4d ~'~ifK~,t' 4+re the ÃJi)V.S`'.[1) L a12 iLkta activation of the cartridge. As the housing melts or burns away, the terminal studs of the disc 3;ir ectà r are released. thus, wh n the c ar .r~Ke does . cti' sae, the teà :'.':Ãinal studs.. or other portions of the disconnector, are à ÃÃt protected by . l si n created by the cart, e. According the i> ~y P~
of th 0~ention, h terminal studs of i diseoarnector are encapsulated in a housing commpr.Ãsii lg materials that become surfcientaly weakened at a to r peratur-e that is lower than the activation tern etature of the arp"d3a , ` t r` r 's a "`t t r the a, fi y' ri .
a..r r 4ia_t a 5 3takid Ãrr > a k: :trtridge. #S1Ã&1 aaaZ= t .r' al c f3ità s a; Ja riot temperature caused by fire durhng shipping, transit, or storage, the tempera u'~..`-sufficientiv weak-ens, the walls of the disconnector housing or the adhesive holding th -0 t' i ~K of Lt i.:~L~l.~ai3r_~:~.a~"
'housing :$ti:~t~`:'~.
is Si Y" t tCbefore the y~,n increasing, i >~. a temperature '~temperature ~:~a'e ~ses .~.w rtrvfi.t:t~~aa of the cartridge. Thus, when the cartridge does activate, the explosive Ãbrte from he ac` ivated cartridge does" not produce a large press r'e increase Within the dÃsc n eett r because the weakened walls do not contain the expanding gases from the ca tÃid.4, e. In t is Case, the explosive force for fhe activated cartridge is not sufficient to produce projectiles of the magnitude required for classifcat_Ãon as a hazardous mate ri<al by C
DT.
1'0011, According to vet another aspect of the invention, the term al studs of the discoaennector are encapsulated in a housing kcomprising materials that melt or bum, or are sufficiently \ Y',e a cneXl, dui d n g a fire prior to activa.t} of e disconnectox's disco ct cartridge. Because the cartridge is encapsulated in the dis \itaK, Ãa=.':ctow's ho,. , t, e cartridge will expenien .e a slower rise in temperature t sar the ho s I
un-during a tire. Accordingly, the h:ousin>gsL an comprise materials that Ã:1elt orb urn, of are sufficiently weakened, at a teTnperawre that is a o-v the activation tew peratuSe of the akrtri ge as long as the housing :Ã ateraals melt, burn, or become weakened before flne temperature Inside, the isconn :a to: increases to the activation teinpe`,atur of the e--[00 These and otheas-,Cts, objects, and features of the invention will t+ Cone apparent t om the ibliow'i.ng detailed description of the e.:xempary embodiments, read in con, )6`xfl6=di3 z '.lth, and reteren 'to, the accompanying drawings.
BR.I-E'F DESCRIPTION OFTHE DRAWINGS
[0013] Figure l is a partial cross-sectional of a conventional higilh, voltage surge arrester with a. heat-activated disconnector, [00,; 4 #"'f,w.3"a. a 2 z4 w. -, i~"ss- e~ti.tsf3n t3 ct` W an 'ar w ' : c l view 'w" w of an al'1.." tfi~: ~~isc~~ frp~.~.m ect~, t'3c~.w3~u.3p to an exemplary embodiment.
[001 -y Figure 3 is a cross-sectional view of the arrester diseonnector of F
is .are
F :: s D OF aME IN\'EN j('N s 000'11 Sae i;w~'e{ltiS.1 : relates generally . i hig x. volt ~ Y i .. _..>
Power generation and t:.a:15:mssion systems, and more specifically to the s .,e transportation r-=.d storage of surgge rr stets having a heat activated disconnector.
R".0021 Electrical power transmission and dis,,tvibution equipment is suljjeet to Voltages ;pith in a t a3rly narrow. range under normal operating conditions, and the e , ip Tent may opi 'a` :e at high -voltages of. for example, I OOOV or greater. However, 53`ste;;a dis wriiaa ces sz.t as ligght 3.in strikes and switching stages the momentary or e tendeyd voltage levels that greatly exceed the v R experienced by equipment during normal operating conditions. These^ oltage va?ri.ations Ãifell are referred to as over--voltage conditiosnns. if not protected from over-voltage.
cà nditio>ns,. crit_ica and expensive equipment, such as transfoimersc, s Ãtch"#_i tg Ã3etiioes, computer eqw :,i and el l p~iei~t, z~ ,t.r.Q~;.: rnach.,rÃry> may be damaged or destroyed by such oL`ei".
voltage conditions and associated i r_,ngl for .. current xt resurges. it is routine practice practice ~.: al?
system designers to use surge arresters to n 3i t.~ d; rem components from dangerous over--volta---e.= conditions, 1UUO31 A surge arrester is a protective device that is t nluri' only Ã=+?a-i> dr'a` in parallel with a comparatively expensive piece of electrical equipment to diert over-voltage-induced current safely around the cc, . t, thereby protecting the equi i7ieni't and its internal L .rc itr . aÃ? Ãic a agc, The surge arrester normal. `
operates ei a high impedance :ode that provides. a low current path to ground having a relatively high ini cc trice, In this aioÃle, normal current at the system "fteclu ncy is directed Cs the le+ ,z =ta equipment and is ire 'r`ent ` t'oi to`low1 1g the surge current to ground long the current. path throÃagh, the surge arrester. When exposed to an.
à 'ei oltag c= >nd#i the S~ S ca tis q,..
ut3>a.~it3iss.i. thsurge, T," ~ a.>:e.4C w~.i' operates .3 in a low iial~3c`iaiii"ii.:~: ia:f3Ct that provides a aA.`+gfh~
current path, to à leictr ical y i.I k: relatively impedance, r e :~ surge arrest _'1 is cap rating in the low-impedance mode, the impedance ofthe rreh +.a t.ialiy tower than the impedance of the equipment b,ng pot Li ': by the s >ge arrester. In this mode, F i3.t.tent. kl:o_i1, the over-voltage condition is directed -to g,~row-jd and not to the electrical equipment Upon completion of the ov Z ita: e conditio7 , the surge a estea returns to operation in the high i?u ance à lode. The surge au-.ester also includes a disconnecto, that disconnects the sursge acres e t t taa ground 'lie over-'~ t..
4'?.
Itcawae' ea`,ii;1t~,<C or, is too extreme or continues too long.
LOOP 4] , iwure .`s a partial cio s-sectÃona view: a cony .nt,.ti:ia~i 'i ag...
voltage surge a,-rroster 90. As illustrated in Fit u the 3 3 t ai e surge arrester 90 ,`icaaiiy includes an elongated outer enclosure or housing 104 Made of :Ã
<fr'ct ically' insu`latin material, a pair of electrical terminals 1Ã02, Ã~?4 at opposite ends of the enclosure 100 for connecting the arrester between, a fine- otentia1 conductor (not 12ti w Ã> an Ci a L ( :F"si3 ~. ruyund (not shim n), respectiv rye and a stack or array of other el'..~.~c+a i .` = ' the ~i.x1 :. a.:oin~~iy"i~..'i~s 106- that, .:?'ail it series electrical path ~3et~~;~ee ~ t~. terminals 102 %-id 104, x erminal stud. 088., 1. .10 connect to the line =1 g-roan 1 t' Ãiifi'i#.i .s, 102 and 1 r specs . re y A- -,a mt s a ateu mou ntmg bracket or hanger xng r 114 also rnay < providod for mounting of the arrester 90 to, for example, another piece of equipment or to a utility po ...
[0005] T e prevent ort circuiting of line Potential conductors connected the surge arrester 90, a d sronndctor 112 is provided on the ground termii stud 110.
The d.Ãsconnectto" 1.12 t nay include an internal resistor or other electrical element connected in parallel . with a spark gap assembly` à nd a 'i1 -=.ià ed; black powder in xi aa3iia.~t>t'3azv~? ~~e_~ .22 caliber i cart-ridge Cxhi " in t to~..4t iativ that is heat '{~ activated, Thus, in .~yw `'=Ti of a ~'t,.:~iw#3 Over-voltage Current flow through the terminal stud y 10, a spark- is generated by the "park, -gap, assembly of the d sconne+ for 112. l- eat from ` s:
the spti_i i~~ :tz`tes .. the .te ~=h c'azed powder cart dge to mechanically sever elects cal cc nn a eio.Ãi between the terminal stud 110 and the low u terminal 104 in the housing 100, thereby isolating the to mfinal stud 110 from the ei ~,n à ii The force R'S STM s'c:. y' of g ti as t i a I1~ C : f 1?G tie A created the <= : -I 333 i,. <ai`4a%d 4' h powder cart >4',~ typically causes the r r terminal stud 110 td arait : .tro the surge arrester 90 thereby effectively isolating à fie tailed attester .fcita the pow r system.
[0006]
i i L li abl i t3 tÃ:t8ta t?i E3ti[ 1i faà 4 :tai 4 e disron e t _ ~' , iiidlu i s'f the terminal stud. -110, can become a projectile when the cartridge. is inadvertenfly exposed to heat during shippin , transit, or storage. During transport and storage, ran accident or otter occurrence results in a iir near one or "'lore arresteers, activation of the chugged 1:,K?wder' cartridges of the disconnecters in the arresters can be hazardous to first responders at the, scene of the fire. Projectiles aitributa#ie to detonation of the c'ha L powder cartridges o she discon lectors, in such fret i> :.iices aru of particular cconeerp. 1,ar ioiiiarly when a large nui ber of ai este`rs with s ch d.isoonnectors are shipped and Stored. A variety of different t+ es of conventional surge arresters `3t disconnectors are vulnerat le to the ` "`r ` similar iiiktwLs above. Additionally, Si~~t3i' problenis may be experienced by all disconnector devices. The Problems noted above r^:it= therefore not consli erect unique to any pat ti ti pit dise iii t ii or to any particular surge arrester.
[0,007-, In light of the ha a rdss posed b--y- arresters when, '~w ~.=
i5bleet~'.a to ~ t o a ', fire Y
shipping, transit, or storager, the United States Department of T twinspo3 nation ()OT) has classified conventional surge arresters as hazardous material; that nmst be u .`n1, r,kL`'.ia ord ance wit;~a DOT hazardous m2<3ti=i"`aCa. a n t as 3ation r = ~g ti '~ ,.
at4~Y. tS.fi..L.=~, ,7 r. z ii~s ii, a ..y ~.`e'i L,i.r1.'~5~.
```.t an ~^ ii~A tii-l yt arresters antd those : L ri it:t tit ~e. :s' i`Yc. f c the cost of such F
i ~ 3 a3> tc#al.?
.'3t..tt.3`l.eiti3'~,~'~, the t4 t t DOT safety regulations few can be met by fitting \ ca~`'areSt` ';~, T~~r'iit3 F~~ akt ti'r:=.ta-ui ,-reveiil i s te i'ia, stud and portions of the disconnactors ft`or.. becoming a ieetiles when the disconnector õarrid is inadvertently exposed to heat during shipping, transit, or storage. Howe ,,er, adding such restraints me easses the cost of Fa'.t't .>=.i's 'i3ititan a)... panZi; 3. to ~ package the a..eesters in Sturdy metallic cases during shippirig, transit, or storage to riieÃ't the D re 3iremel tssthough such packaging may be 3ro`aa ttivel ex einsiv e.
10008-1 Accord i>igiy, a need in the art exists for a surge arrester dffiscoimector t' that of classified as a hazardous material under DOT r-egulations.
SUMMARY THE `NV? ;C IO
[1)009] The invention Provides, a n inexpensive and practical way to prevent the ennina.. studs and other portions of a heat-sensitive arrester discor.,n,ector from becoming Borceiil prÃ` c.-ti?es when the dis on neeto,,r is ex oseda to excessive heat' a' ntaxm shippili#g,,. I-ai 1 7 t9 siii Lt`. i accordance r¾'ittl ozie aspect of t, iii 'a` ili `ion, the terminal studs of the disconn ctoii are encapsulated M. a .oust."i.4, f ts ~. ~,i`isit,~, iir~tt'b_,~.r=a t iat melt or burn at a tea erature that is lower than the ac . atinn temperature of the di.s :oine don's disconnect cartridge. The activation temper.it:tre of the at'tridge is the t is J w,,,ture at which the propellant in the cartridge Ã:e.. Ã1Ãtes. The activation to à 3er rt 2e is sometime . to as the ~~ i "r. if3rà t perat rrd . When the arreste encounters r sit r t r n .~,.
rising wart rah caused by f re during shipping. trans' ? tÃa r: fl ia.1. are aà E r"t, Jv t{dry =g m4tJ.~erl<J.r~K sY `MyIt or away e1 '4c~, e[ .3in k cF ~ re ca -uses a~lita iJtr Jt m eh burn 4d ~'~ifK~,t' 4+re the ÃJi)V.S`'.[1) L a12 iLkta activation of the cartridge. As the housing melts or burns away, the terminal studs of the disc 3;ir ectà r are released. thus, wh n the c ar .r~Ke does . cti' sae, the teà :'.':Ãinal studs.. or other portions of the disconnector, are à ÃÃt protected by . l si n created by the cart, e. According the i> ~y P~
of th 0~ention, h terminal studs of i diseoarnector are encapsulated in a housing commpr.Ãsii lg materials that become surfcientaly weakened at a to r peratur-e that is lower than the activation tern etature of the arp"d3a , ` t r` r 's a "`t t r the a, fi y' ri .
a..r r 4ia_t a 5 3takid Ãrr > a k: :trtridge. #S1Ã&1 aaaZ= t .r' al c f3ità s a; Ja riot temperature caused by fire durhng shipping, transit, or storage, the tempera u'~..`-sufficientiv weak-ens, the walls of the disconnector housing or the adhesive holding th -0 t' i ~K of Lt i.:~L~l.~ai3r_~:~.a~"
'housing :$ti:~t~`:'~.
is Si Y" t tCbefore the y~,n increasing, i >~. a temperature '~temperature ~:~a'e ~ses .~.w rtrvfi.t:t~~aa of the cartridge. Thus, when the cartridge does activate, the explosive Ãbrte from he ac` ivated cartridge does" not produce a large press r'e increase Within the dÃsc n eett r because the weakened walls do not contain the expanding gases from the ca tÃid.4, e. In t is Case, the explosive force for fhe activated cartridge is not sufficient to produce projectiles of the magnitude required for classifcat_Ãon as a hazardous mate ri<al by C
DT.
1'0011, According to vet another aspect of the invention, the term al studs of the discoaennector are encapsulated in a housing kcomprising materials that melt or bum, or are sufficiently \ Y',e a cneXl, dui d n g a fire prior to activa.t} of e disconnectox's disco ct cartridge. Because the cartridge is encapsulated in the dis \itaK, Ãa=.':ctow's ho,. , t, e cartridge will expenien .e a slower rise in temperature t sar the ho s I
un-during a tire. Accordingly, the h:ousin>gsL an comprise materials that Ã:1elt orb urn, of are sufficiently weakened, at a teTnperawre that is a o-v the activation tew peratuSe of the akrtri ge as long as the housing :Ã ateraals melt, burn, or become weakened before flne temperature Inside, the isconn :a to: increases to the activation teinpe`,atur of the e--[00 These and otheas-,Cts, objects, and features of the invention will t+ Cone apparent t om the ibliow'i.ng detailed description of the e.:xempary embodiments, read in con, )6`xfl6=di3 z '.lth, and reteren 'to, the accompanying drawings.
BR.I-E'F DESCRIPTION OFTHE DRAWINGS
[0013] Figure l is a partial cross-sectional of a conventional higilh, voltage surge arrester with a. heat-activated disconnector, [00,; 4 #"'f,w.3"a. a 2 z4 w. -, i~"ss- e~ti.tsf3n t3 ct` W an 'ar w ' : c l view 'w" w of an al'1.." tfi~: ~~isc~~ frp~.~.m ect~, t'3c~.w3~u.3p to an exemplary embodiment.
[001 -y Figure 3 is a cross-sectional view of the arrester diseonnector of F
is .are
2 a;lustrÃat,ig a current path n a traniucAit o '`^cr i'o ttage or'dition n:o:'d'zaig to ar, exern lar e nbo di ent. of the inve tiora'.
`0016 Figure 4 is a cross :sect onall view of the am-ester disconnector of Figure 2 llustl-at.ng current path in a low im ance, over--voltage fault current" Mop according to an ~ C 1 y emb dim iii.
DETAILED DESCRIPTION OF E EMPLARY EMBODIMENTS
01he invention allows fir sate detonation of a dh coai_ e ., Cartridge in, a t Y r 3 o ff a `a <i3, g n in of fire Burn t 4t r of a s s' ut a the ., E 'c ri sa L,6 a3i f3 i~1:} r 6011 CL
n w dhscon it,etoi s housin ? > .i 2'35es :mate ais that ael , h ' or other.
..si'. become.
weakened during a, fire before the fire causes activation of the cartridge, thereby allowing the discos necior's terminal Muds safely to detach from the disconneetor Y ~ of before activation of the cartridge or pre venting ~ more forceful explo` : bn. Such action revents the terminal studs or ot1 ~i.Z.`~ !li:s of the, disconnector from being ~ Zi h. Ya - a 1.. ~+ ~:..being Q.y ~~c2f~t3.'~,F'd as force ail Projectiles when the S arttridgg is ac ivated. When the cartridge eventually discharges, arts of the .di y". corme`.^et are not pro ect d at Beds or distances thek ipuail 100,18] The folios wing description of exemplary embodiments refers to the attached drawings, in which like numeral indicate like elements throughout the f4gu r;
i à 0 9 i ;&i re 2 is a cross-sectional vie",-- of at' arrester d?sa:onneetÃrr according to an exemplary ' embodiment of the invent on. The disconnector 2 comprises two terminal. studs 2021. 204 separated by an Zle .;r ,cal element 206.
exe pl.ar e>]ibodiirients, he i lectrical element 206 can comprise a resistor , a capacitor, is v ri o . an insulato1, or3ow ~lZ#Ãrnbinations of two or more of these toms.
A. housing 208 ex ~ : ~. .t1.1..C. ;~ 2 .. 204 and the ai :t,''3ax~Iaent R ,... 2 06: thereby ~Sa 3. a{Z the to nin l stud,,, 2702, 20e electrical ~.
~~1 aseatmg a sealed chamber 210 between the lermtnai studs 2022, 204. A
disconnect ccartridg 212 is disposed within, a recess of the terminal stud 202 and is positÃoxied ,with anet d ad aace 13 a t3 o`i .. C,3 204a of thterminal stud such that an air gap 214 is r` tet @'t~'e~:aa 1 the : `~ .Ã? and the cartridge s.. is 212. An ri : t 1116 .+- is t?tg::=~:-~.~F 1.~ 27,04a +~`~ s t:,Ãi_sill~~~,~+Yr3,, aeC;~Fi`C+vi3 lid sa=,1xaliaaa.I fil`,.:CI. ~f eai"r lilt. Ã:r31`~~~5::..1~.
[0020] In an exemplar embodi ent., when used in conjunction with a surge arrester, s c ss,3$ surge arrester 10 `~
0 ` Ã1 Ãi i Cl in Figure 1, the tern-final y t ? z (([3), 4y ~ $ .~~~i aS_. ~ , ~] ¾}2 ri(3) 204 car.
M t3.id. ga `rL.\n termi ZL~.~1l s3. 2d 110 of the surge arrester, Additional \ he te:-).iiiLi( l stud 202 can, be coupled to the electrical terminal 104 in the housing of the.
surge rester..
[00211 The terminal studs 202,204 are Ã) med of conductive Priaterials, such as stainless steel The electrical le CÃA 20$ is designed to resist current flow during norm-al voltage conditions in which a particular disconnecter 200 is operated, .0022] The disconnect e trtridge 21.2 can comprise a 22 calliber cartridge having a black powder actuated chaff e. For example, the powder cha can comprise . ~ 1:.ia:>11 .'ci a`2j,. i1?5 'd`.r.7t nt sold -ol l under iailea the WINCHESTER trademark.
00731 In a surge arrester operating under nà rural voltage conditions, the surge arrester Aerates, in a .`li4a-impedance mode that provides a low Curren tt palls to 'our ad having relatively high .ii st.à nce. Because of the 11IgIi- roped e d the current t t '= tl S t Y
path caused by the electrical components 1.06 of .-1+~: surge arrester, a~ltr .:~ iti.isi..FZ`~ .~Iy little, if any. cur i`ent is directed. to ground. Accordingly, iii this node, current is directed to the electrical C:Cli3p:t qunaà to which Ãle surge arrester is i,.Ã?il,aed:.lL`d;
[0024] Figure 3 is a. cross-section 'Cl. viewer` of the arrester disconnector 200 of Figure 2 Illustrating a current path 302 du i.ng a transient oVO:I_Voft"%ge condition a< cÃ`:rding to ana e? empla,vv embodiment of the invention, if a t ans.l.ei11 over-voltage `edition. occurs in a sarrester comprising the e ia t., -Ãililea..: ~ a the c.
t'tr.,a surge to - ....ili} t3. electrical electrical components : '06 of the, s Ãir e a rester operate in a lz` `: i"yediia' ce io QZ dire the over-volt-age. through the d isconneeto~r 200 to g. round. In this operation, current throUvh the d iseonnY ctor ?00 follows the current path 302 through to i Ai=n al st 202, electrical element 206, and terminal stud 2,04 to ground '"1a a gtoun d wire ('not s owis). When the over-voitage conditions ends, the electrical c onenÃS 06 again operate in h hig i-`ii nedance mode to direct current to the electrical equipment to which the arrester qw t `d having the ,7:s'~Zs3.+a..1.. ,.-2cf~ i ~> 200 z is connected.
1',.%:ir'.the a,7.
[00,C51 i v the electrical components 06 of the surge arrester fail the surge arrester 200 op a es. in a low-impedance mode that pro ides a high current pa '.t to the +Y `~~. G:~.1.~a ..`..a ~.,,~_tgC_ C a eie4r _2.~.Z;` ` 23ri~cli~c.~. having " relatively a l ~:M 1.~: , % ground ~,. is low Y~ 1p~~..k . ~~.\+n t4"~~.'xi'x;v.~
o'''s`,'t".rati:i.~. g in the -~ t"he l ,i>~~"-2 t the a.=as,n l~~atizai~ :~.
mode, t~~< ~iI`te%~~ilo:L~' of f the current ~?si.:: is, rent piii protected a by the ti' -, substantially lower than the impedance of the e cur b arrester in which the disco hector 200 as dis'`,'osed.
arrester in [0026] the surge e.:- ester .iii which be disco.-nnectoa 200 iu disposed .Y
t`aiz4, the,.: .~ a to a'r3i:,a r current can be Y C t `,. ' as~ia.gi~ txi~. e currem s path 3? ~~. ~ ~~ià the -a ~lfi,.ll~~, a-J -.t.. It current is directed to ground via i.21P. current path 302 as describepreviously for the transient Ove oltak' e. condit on. .1-However, a continuous fault current will. follow a c a:rrent path 402 illustrated in Figure 4 b-,,, arcing across the air gap 2:$
in the dise-oniiector 200 to, bypass the electrical element 206. Figure 4 ,k a cross-sectional view of the a est# t' o isronnector 200 of 2 illustrating rant p^:i. ~"lg Figure ~i~ currant path, ~(, 4)2 aa., a low impedaance, over-voltage ult current mode according to an3 ex mpL .. ~
lar r iTs `Y it?i ent of the invention 00 27: i t ^i r a the ~L?
As .;~^ti:itt'ai>eU in ~yas~,;a`^ a~i`. , ~~.la~.ii tllc r >visc~3a:.tiecta.3i' 2Z ~0 ~li:f?i.ii~i~i":~ fti~.
continuous fault current,) the available fault current fol-lows. the current pis?: 402 tiahro gla the terminal stud 202, the :gait adge 212. and the retinal 'stud 204 (via the, protrusion `7[
204a) to, ground ^i.13.ia. L'. t a ground i t path 'rt 2 '~?~#~:.. stai.~;5 oa , Ywire ~`$~`3t shown). This current current s:.ti. i{3'aim.it.
.et t n 3 air o, 2 .q r+ f.' Y
`0016 Figure 4 is a cross :sect onall view of the am-ester disconnector of Figure 2 llustl-at.ng current path in a low im ance, over--voltage fault current" Mop according to an ~ C 1 y emb dim iii.
DETAILED DESCRIPTION OF E EMPLARY EMBODIMENTS
01he invention allows fir sate detonation of a dh coai_ e ., Cartridge in, a t Y r 3 o ff a `a <i3, g n in of fire Burn t 4t r of a s s' ut a the ., E 'c ri sa L,6 a3i f3 i~1:} r 6011 CL
n w dhscon it,etoi s housin ? > .i 2'35es :mate ais that ael , h ' or other.
..si'. become.
weakened during a, fire before the fire causes activation of the cartridge, thereby allowing the discos necior's terminal Muds safely to detach from the disconneetor Y ~ of before activation of the cartridge or pre venting ~ more forceful explo` : bn. Such action revents the terminal studs or ot1 ~i.Z.`~ !li:s of the, disconnector from being ~ Zi h. Ya - a 1.. ~+ ~:..being Q.y ~~c2f~t3.'~,F'd as force ail Projectiles when the S arttridgg is ac ivated. When the cartridge eventually discharges, arts of the .di y". corme`.^et are not pro ect d at Beds or distances thek ipuail 100,18] The folios wing description of exemplary embodiments refers to the attached drawings, in which like numeral indicate like elements throughout the f4gu r;
i à 0 9 i ;&i re 2 is a cross-sectional vie",-- of at' arrester d?sa:onneetÃrr according to an exemplary ' embodiment of the invent on. The disconnector 2 comprises two terminal. studs 2021. 204 separated by an Zle .;r ,cal element 206.
exe pl.ar e>]ibodiirients, he i lectrical element 206 can comprise a resistor , a capacitor, is v ri o . an insulato1, or3ow ~lZ#Ãrnbinations of two or more of these toms.
A. housing 208 ex ~ : ~. .t1.1..C. ;~ 2 .. 204 and the ai :t,''3ax~Iaent R ,... 2 06: thereby ~Sa 3. a{Z the to nin l stud,,, 2702, 20e electrical ~.
~~1 aseatmg a sealed chamber 210 between the lermtnai studs 2022, 204. A
disconnect ccartridg 212 is disposed within, a recess of the terminal stud 202 and is positÃoxied ,with anet d ad aace 13 a t3 o`i .. C,3 204a of thterminal stud such that an air gap 214 is r` tet @'t~'e~:aa 1 the : `~ .Ã? and the cartridge s.. is 212. An ri : t 1116 .+- is t?tg::=~:-~.~F 1.~ 27,04a +~`~ s t:,Ãi_sill~~~,~+Yr3,, aeC;~Fi`C+vi3 lid sa=,1xaliaaa.I fil`,.:CI. ~f eai"r lilt. Ã:r31`~~~5::..1~.
[0020] In an exemplar embodi ent., when used in conjunction with a surge arrester, s c ss,3$ surge arrester 10 `~
0 ` Ã1 Ãi i Cl in Figure 1, the tern-final y t ? z (([3), 4y ~ $ .~~~i aS_. ~ , ~] ¾}2 ri(3) 204 car.
M t3.id. ga `rL.\n termi ZL~.~1l s3. 2d 110 of the surge arrester, Additional \ he te:-).iiiLi( l stud 202 can, be coupled to the electrical terminal 104 in the housing of the.
surge rester..
[00211 The terminal studs 202,204 are Ã) med of conductive Priaterials, such as stainless steel The electrical le CÃA 20$ is designed to resist current flow during norm-al voltage conditions in which a particular disconnecter 200 is operated, .0022] The disconnect e trtridge 21.2 can comprise a 22 calliber cartridge having a black powder actuated chaff e. For example, the powder cha can comprise . ~ 1:.ia:>11 .'ci a`2j,. i1?5 'd`.r.7t nt sold -ol l under iailea the WINCHESTER trademark.
00731 In a surge arrester operating under nà rural voltage conditions, the surge arrester Aerates, in a .`li4a-impedance mode that provides a low Curren tt palls to 'our ad having relatively high .ii st.à nce. Because of the 11IgIi- roped e d the current t t '= tl S t Y
path caused by the electrical components 1.06 of .-1+~: surge arrester, a~ltr .:~ iti.isi..FZ`~ .~Iy little, if any. cur i`ent is directed. to ground. Accordingly, iii this node, current is directed to the electrical C:Cli3p:t qunaà to which Ãle surge arrester is i,.Ã?il,aed:.lL`d;
[0024] Figure 3 is a. cross-section 'Cl. viewer` of the arrester disconnector 200 of Figure 2 Illustrating a current path 302 du i.ng a transient oVO:I_Voft"%ge condition a< cÃ`:rding to ana e? empla,vv embodiment of the invention, if a t ans.l.ei11 over-voltage `edition. occurs in a sarrester comprising the e ia t., -Ãililea..: ~ a the c.
t'tr.,a surge to - ....ili} t3. electrical electrical components : '06 of the, s Ãir e a rester operate in a lz` `: i"yediia' ce io QZ dire the over-volt-age. through the d isconneeto~r 200 to g. round. In this operation, current throUvh the d iseonnY ctor ?00 follows the current path 302 through to i Ai=n al st 202, electrical element 206, and terminal stud 2,04 to ground '"1a a gtoun d wire ('not s owis). When the over-voitage conditions ends, the electrical c onenÃS 06 again operate in h hig i-`ii nedance mode to direct current to the electrical equipment to which the arrester qw t `d having the ,7:s'~Zs3.+a..1.. ,.-2cf~ i ~> 200 z is connected.
1',.%:ir'.the a,7.
[00,C51 i v the electrical components 06 of the surge arrester fail the surge arrester 200 op a es. in a low-impedance mode that pro ides a high current pa '.t to the +Y `~~. G:~.1.~a ..`..a ~.,,~_tgC_ C a eie4r _2.~.Z;` ` 23ri~cli~c.~. having " relatively a l ~:M 1.~: , % ground ~,. is low Y~ 1p~~..k . ~~.\+n t4"~~.'xi'x;v.~
o'''s`,'t".rati:i.~. g in the -~ t"he l ,i>~~"-2 t the a.=as,n l~~atizai~ :~.
mode, t~~< ~iI`te%~~ilo:L~' of f the current ~?si.:: is, rent piii protected a by the ti' -, substantially lower than the impedance of the e cur b arrester in which the disco hector 200 as dis'`,'osed.
arrester in [0026] the surge e.:- ester .iii which be disco.-nnectoa 200 iu disposed .Y
t`aiz4, the,.: .~ a to a'r3i:,a r current can be Y C t `,. ' as~ia.gi~ txi~. e currem s path 3? ~~. ~ ~~ià the -a ~lfi,.ll~~, a-J -.t.. It current is directed to ground via i.21P. current path 302 as describepreviously for the transient Ove oltak' e. condit on. .1-However, a continuous fault current will. follow a c a:rrent path 402 illustrated in Figure 4 b-,,, arcing across the air gap 2:$
in the dise-oniiector 200 to, bypass the electrical element 206. Figure 4 ,k a cross-sectional view of the a est# t' o isronnector 200 of 2 illustrating rant p^:i. ~"lg Figure ~i~ currant path, ~(, 4)2 aa., a low impedaance, over-voltage ult current mode according to an3 ex mpL .. ~
lar r iTs `Y it?i ent of the invention 00 27: i t ^i r a the ~L?
As .;~^ti:itt'ai>eU in ~yas~,;a`^ a~i`. , ~~.la~.ii tllc r >visc~3a:.tiecta.3i' 2Z ~0 ~li:f?i.ii~i~i":~ fti~.
continuous fault current,) the available fault current fol-lows. the current pis?: 402 tiahro gla the terminal stud 202, the :gait adge 212. and the retinal 'stud 204 (via the, protrusion `7[
204a) to, ground ^i.13.ia. L'. t a ground i t path 'rt 2 '~?~#~:.. stai.~;5 oa , Ywire ~`$~`3t shown). This current current s:.ti. i{3'aim.it.
.et t n 3 air o, 2 .q r+ f.' Y
3.f.? arc 3`. 7 the da s3 '`s_.>N= be t wee ?~ ~i. he proj ction 204a o Une `r zi3mal stud
4~
204 and, the end of the ; midge 212.
30,28"' The detonating are 40 1}m7 is heat energy ~~ufficient to detonate the propel i?t in the cartridge 212. 2211 The detonation of the cartridge 212 initially is contained Inflne sealed chamber 210. However, the pressure within the seal,`,,d chamber 210 increases until the fore e created by the detonation causes the E g 208 to ;.~#`i?S;:ti-ti'f,:, L~Sai?i'~: can y Y.w-r- C rev Y'">`
:,r( e +..~i . t pieces of the h~.uscx ins '3 the 08 Into tarea.
Additio ..ally the force created by the detonation. project4 the terminal stud 204 away from the is..=c?na ei,.4or 200, thereby severing-the current path 401 The fiffltel arre;~~:_. in the disconne to,20 i is disposed is thereby effeclivei isolated from ground, [0(129] Because activation of x r tr:ilt;iÃd,r.. M. e 212 :, ithe in the disconnector 2,??i3 produces a projectile (the terminal stud 204 and/or fragments from the housing 208) with a certain force, the DUF could i'n4.S1}i^G the I:15L=omne~tu= 200 as a hril..s`?.:'"do:i iz~i3~c. .'#; L~ik.~.s'.i;:~~ of the potential t er 3 `t"iial .~r the, cartridge 2à in =2 t in the. ever,-,. of e ~.# a fir during shijnpià g.. transit, or storage. However, the di connector 200 comp rises safeguards to prevent the forceful prole tion of the tÃ'A~"Ãi ina stud 204 and, housing 208 [0030- In an exemplary e nbodiment, the housing 208 comprises at least one material having a lower melting point and/or ignition point than the actin ation i ~~ ~_ re of 1.1 e rte.t'e -amidg Ye .'Z. The activation tern, perfa2.4.ure Q~ . ;y ire of the c5:~.`. v 1.2 -'r~~e empe3... 2-11.x.,.. : 2 ~.. ~ :#~_J...
ieiamper.,- U e at Which the propellant in the cartridge 212 ignites. The activation tempera`iute, is sometimes referred to as the a to ig itioin temperature... In '.hi ernboi i'inegnt.,the terminal R>studs 2}0 2. 204 are disposed in the housing 20$ co .`.i~p :,risi[.g at least asfi S d.iib 1 3w 2{ tee .C:.? l , 1Sa t nelt or 6i " lies at a rclatiwcily lower ten pe iii with ec. t ro ~
the activation temperature of the cartridge 212. At least a portion of the housing 208 melts or bums tin i #.i 4 a fire before heat from z the fire causes, the cartzidge to activate, thereby allowing the terminal, studs 202, 204 and housing 208 aterials safely to detach the 1sL:~F1 ran+l.ki{i~?i" ~ ' x~:xi~'Ca~{.i~3>~ of the s= t from ~~i~2-00 "v e ia~t,i..~. " cartridge 2 ...~.1 . ~~ 3i-if~:~f3:
w~u':3:~3ii= prevents.
the terminal studs 202, 204, the hosing 208, or other portions of the disco-iui cÃor 200 from being discharged as r~ ceful projectiles when the chid e t,'.12 activates. Thus, whei the car aid .~e 212 event -a3= dischar.,es, parts of ~ the da:Ci:3i=z;,clo' 200 , are, not prof {e;cte . at speeds or distances that qualify, as a DOT [010311 In an exemplary emhodil en , the entirety of the housing 204 cem , .i es < =a,a:en4 i>4- a lower m ii3u i3.ir ari ignition, .r, Air activation to s e., ature of the cartridge 212. Alternatively, only v l F
Z3ii:~ ti `: housing =2'08 or that sea the housing 208 to the I aina studs 202, 204 and the electrical element 206 comprise the m aterial laving a lower melting point and/or igaitionpoint than the aetivruion temperature of the cartridge 212, In this embodiment, as the material in the nt iims or melts, theh0.Fus r:=SF~ housing <. = 0a`.y$ opCia:.
s amid /or Qom. xGiQ7~
S ~y away from the di E actL-El nr 20V0:. In S another ~t ?t1. yvq`n{ the housing r~ pr~i~r',.^
~+
:4t.t ,`.siU\:
iaiS~t~Lo +r~i2e ]:: em,r a 4~}t o,r )` U.~kI{r2, the .:_.\ 2F ~~ 1v.~Z~..,Z
Wi sa 3i.
xvi r melting Point and of ignition point than the ac ivation ~::`f+t$:~~i~~. ~y.)~fw r a g a lower :=z. r12 .+~ a ,c? j th} yipt t\p+~(Y a y-~Y di?¾fe,t~ material.
tem pnature of the cartridge 2 while e join clTi1.~i` issge a r-ci t [0032" In another exec platy embodiment. t,e # 3ousl g. t i~ p,+rises at least t9" .z~,,te is that becomes sufficiently weakened at a temperature that .is lower .that f he In this embodiment, the terminal studs 202), 204 of the disconne - ,,) 200 are encapsulated ,n a housing 208 comprising at least one material that hecom.eti sufficiently weakened at ahen temperature that is lower than the activation \S,,.li ".`aay.p`a..iL tt of the dge ? 12. When the e disco'.~e'cto. 2., ou.q e` at r tr~~ V 7:t L'1 ii \ ;: 073.~ : wt~its`'..ts rising temperature causer by ::re during shipping. transit, or storage, flne rem to tr weakens iaL= walls 7~.,s of the i 208 L~ >a r xa 'it: Joints the sufficiently h`, .. i,{ f` >thousing ? ``,~~t<iQi'`' the increasing ter perature ca,. ses activation of the cartridge 212. Thus, when the cartridge 212 does activate, the explosive free from the activated cartridge 212 does not produce a large Pressure increase i"rttiti the sealed chamber 210 of the disco `.iector 200 because the weakened wails or-joints of the housing 208 do not contain, fia the cart idge 212L In this case i'e.'ze explosive -:Circe for the activated cartridge 212 is not a1:3 ~:#Li o3aa ~t to ~ prC`.ti :uc`. pii3jt.t) ,.;Y#es of the, aiT; agi,itrrÃr~?
` required ` abr classification classification of the of t.~
. isconnector 2i)0 as a hazardous material by the DOT.
[0033] In an exemplary em bo i m rent. the entirety of the housing 208 Y
cot , rises a .r<terial that becomes sufficiently weakened at a to peratuae that is lower, , than tMaie activation temperature of only the cartridge 21.2. 'alternatively o, joint in z ~
. the housin .208 or that Seal the housing 208 to the terminal studs 202, 204 and the e,lectprical ~element .~06 comprise the mate :al that e~+omes. Kw fficiently ~i~'eakened at a tui ,s..t is V r 2.ih4+ bSm ~~',i~tu. fSr~4r ~ 1~ the cart-'C
temperature that is lower than ' the activation 1Z~+ A twif?r \tS )'1 i)r_t :.
t~~ r;
e bomi3nem, taB material in the joints provides the `, 'ea.t en d structure that Prevents the rS.q g 8 -nn containing Y Y. ~15,3.~~, ~?~ .,a t).. a.~ t~ i expanding gases '~F'~o.?.i the cartridge 212.
In another alternative enibodimeKt, ti, . ousing 208 compr ses that beco-n-lo-s L'ii3G.\.a.~=u si.tffia".ie"3?ta}` tau `: ened Lit c~ ait: ',a :.hat is tY` t lower a. than the acrr tivation temperature of the cartridge 212 while the 'oiia.ts comprise a different material.
[0034"
in another exe 3`. ? ca.'':y embodiment. the housing 208 comprises at least one mater "al that melts or bums, or is sufficiently w a enedt (Wring a ..?re prior to activation of the disco. meet or's cartridge 21.2. In this embodiment, the term-Mal studs 20 204 o`Fthe disconnector 200 are gait i f.. t in a housing 208 co uprising at least te'a` melts or bi..rq~ZZaõ or is S1~~~#fÃ~~~~..,. Weakened, ~`ti F 1:a t}Ãrk~i a ~Z,_tL. ~.r _s ;C# ~Z>f to one ..x?.i4~::i a , that .Ãiat,a ti t,r... . f.~3 activation of the disconn .cto 's cartridge 21.1 Because the cartridge 212 as i.
a.=3'i+.:ca~
c c,3:iti3ai.f','d in `^ the .Ã2¾i3usinIg 208, the cf#3tiÃLa i a slower yr n se =a in ~~ 21.2 will experience tS:m.ier a.tui:-e than the housing 208 during a fire. Accordingly. \ 208 its joints) c a n coniprzsc materials that melt or bur , or are su ent]y weak vned, at P, `y t~~t is above re the e activation t+ =d t~i;~ w ~ but t1 temperature ~:>I7i~?~=F"a;iE'#.ii"c of .. t3it .;`a4 housing F..~`~s . z:.a.,~:.i; ') , ;.,.c~-~fwls me-It., .r., or . tea azyF~.i"cas t `+.~,~,.,~~ become ~~t:.a~:ik1e~ before the .u::a,C intiiZ`>i.;
Y. i disconanectà z 200 increases to the activation temperature of the cartirid e 212 to detoria e the c:,x,i"i ge 12 [0103-5] Exemplary materials suitable for the housing 2018 including tine Iits, include epoxy. PVC, other th .mio-plastic materials, or n y suitable material having. t.'~, :e melting, butt is>g, ` we kening charac .eri th:` descried.
i?"vi C:3 In, an, cxer piar- F c'inhodrmerit, the auto-;gri bbun.# poi off, the , opellurt in the cartridge 21, 2 is approximately 190 derescentigrade. Accordingly, e hour ng 4..
i 208 materials will melt, ignite, or become su fficientl weakened at a temperature that is i(= than 190 degrees centigkade, Alt? i`natively, the housing 208 .:.i i ais wiz melt.
ignite, t i weakened <
or become Sw'a'``ti%retiil~i at a t~:.FTiz-`zEu a:re t~li~t as L-,1. ,>> e 190 degrees centigrade lbut before the temperature of the cartridge 212 in the scan a~.f t 33: 20~.
re c hes 190 e r ees centigrade during a fire.
200 f003 a.
r2arc disconnector 00 accor in to the >'x; mplar ` embodiii'ie is dosetabed herein can he used with any surge To-Seer e toying s isolation functions. Additionally, the housing 208 describe(] herein c n be used with any diaconnectto. , provide a fire safe fiwi tion for such disconnector.
[00381 T r~.'a foregoing exemplary embodiments enable a fi safe arrester discon ecto . zany other modifications, fe i: es, and twilit odimgena's will become ev dent to a person of ordinary ski al in the za t having the benefit o f the present tai `Ã su i. It should be Appreciated, t1asrefore, that many aspects of the iii rear'mion were described above by way of example only and are not inter? cd required essential elements of the i 1-venti: n .. mess explicitly stated. otherwise. It should also be understood that the invention is not restricted to the illustrated ernbodimems and that =arknis modifications ca,--. be `made within, the spirit and scope of the following claims.
204 and, the end of the ; midge 212.
30,28"' The detonating are 40 1}m7 is heat energy ~~ufficient to detonate the propel i?t in the cartridge 212. 2211 The detonation of the cartridge 212 initially is contained Inflne sealed chamber 210. However, the pressure within the seal,`,,d chamber 210 increases until the fore e created by the detonation causes the E g 208 to ;.~#`i?S;:ti-ti'f,:, L~Sai?i'~: can y Y.w-r- C rev Y'">`
:,r( e +..~i . t pieces of the h~.uscx ins '3 the 08 Into tarea.
Additio ..ally the force created by the detonation. project4 the terminal stud 204 away from the is..=c?na ei,.4or 200, thereby severing-the current path 401 The fiffltel arre;~~:_. in the disconne to,20 i is disposed is thereby effeclivei isolated from ground, [0(129] Because activation of x r tr:ilt;iÃd,r.. M. e 212 :, ithe in the disconnector 2,??i3 produces a projectile (the terminal stud 204 and/or fragments from the housing 208) with a certain force, the DUF could i'n4.S1}i^G the I:15L=omne~tu= 200 as a hril..s`?.:'"do:i iz~i3~c. .'#; L~ik.~.s'.i;:~~ of the potential t er 3 `t"iial .~r the, cartridge 2à in =2 t in the. ever,-,. of e ~.# a fir during shijnpià g.. transit, or storage. However, the di connector 200 comp rises safeguards to prevent the forceful prole tion of the tÃ'A~"Ãi ina stud 204 and, housing 208 [0030- In an exemplary e nbodiment, the housing 208 comprises at least one material having a lower melting point and/or ignition point than the actin ation i ~~ ~_ re of 1.1 e rte.t'e -amidg Ye .'Z. The activation tern, perfa2.4.ure Q~ . ;y ire of the c5:~.`. v 1.2 -'r~~e empe3... 2-11.x.,.. : 2 ~.. ~ :#~_J...
ieiamper.,- U e at Which the propellant in the cartridge 212 ignites. The activation tempera`iute, is sometimes referred to as the a to ig itioin temperature... In '.hi ernboi i'inegnt.,the terminal R>studs 2}0 2. 204 are disposed in the housing 20$ co .`.i~p :,risi[.g at least asfi S d.iib 1 3w 2{ tee .C:.? l , 1Sa t nelt or 6i " lies at a rclatiwcily lower ten pe iii with ec. t ro ~
the activation temperature of the cartridge 212. At least a portion of the housing 208 melts or bums tin i #.i 4 a fire before heat from z the fire causes, the cartzidge to activate, thereby allowing the terminal, studs 202, 204 and housing 208 aterials safely to detach the 1sL:~F1 ran+l.ki{i~?i" ~ ' x~:xi~'Ca~{.i~3>~ of the s= t from ~~i~2-00 "v e ia~t,i..~. " cartridge 2 ...~.1 . ~~ 3i-if~:~f3:
w~u':3:~3ii= prevents.
the terminal studs 202, 204, the hosing 208, or other portions of the disco-iui cÃor 200 from being discharged as r~ ceful projectiles when the chid e t,'.12 activates. Thus, whei the car aid .~e 212 event -a3= dischar.,es, parts of ~ the da:Ci:3i=z;,clo' 200 , are, not prof {e;cte . at speeds or distances that qualify, as a DOT [010311 In an exemplary emhodil en , the entirety of the housing 204 cem , .i es < =a,a:en4 i>4- a lower m ii3u i3.ir ari ignition, .r, Air activation to s e., ature of the cartridge 212. Alternatively, only v l F
Z3ii:~ ti `: housing =2'08 or that sea the housing 208 to the I aina studs 202, 204 and the electrical element 206 comprise the m aterial laving a lower melting point and/or igaitionpoint than the aetivruion temperature of the cartridge 212, In this embodiment, as the material in the nt iims or melts, theh0.Fus r:=SF~ housing <. = 0a`.y$ opCia:.
s amid /or Qom. xGiQ7~
S ~y away from the di E actL-El nr 20V0:. In S another ~t ?t1. yvq`n{ the housing r~ pr~i~r',.^
~+
:4t.t ,`.siU\:
iaiS~t~Lo +r~i2e ]:: em,r a 4~}t o,r )` U.~kI{r2, the .:_.\ 2F ~~ 1v.~Z~..,Z
Wi sa 3i.
xvi r melting Point and of ignition point than the ac ivation ~::`f+t$:~~i~~. ~y.)~fw r a g a lower :=z. r12 .+~ a ,c? j th} yipt t\p+~(Y a y-~Y di?¾fe,t~ material.
tem pnature of the cartridge 2 while e join clTi1.~i` issge a r-ci t [0032" In another exec platy embodiment. t,e # 3ousl g. t i~ p,+rises at least t9" .z~,,te is that becomes sufficiently weakened at a temperature that .is lower .that f he In this embodiment, the terminal studs 202), 204 of the disconne - ,,) 200 are encapsulated ,n a housing 208 comprising at least one material that hecom.eti sufficiently weakened at ahen temperature that is lower than the activation \S,,.li ".`aay.p`a..iL tt of the dge ? 12. When the e disco'.~e'cto. 2., ou.q e` at r tr~~ V 7:t L'1 ii \ ;: 073.~ : wt~its`'..ts rising temperature causer by ::re during shipping. transit, or storage, flne rem to tr weakens iaL= walls 7~.,s of the i 208 L~ >a r xa 'it: Joints the sufficiently h`, .. i,{ f` >thousing ? ``,~~t<iQi'`' the increasing ter perature ca,. ses activation of the cartridge 212. Thus, when the cartridge 212 does activate, the explosive free from the activated cartridge 212 does not produce a large Pressure increase i"rttiti the sealed chamber 210 of the disco `.iector 200 because the weakened wails or-joints of the housing 208 do not contain, fia the cart idge 212L In this case i'e.'ze explosive -:Circe for the activated cartridge 212 is not a1:3 ~:#Li o3aa ~t to ~ prC`.ti :uc`. pii3jt.t) ,.;Y#es of the, aiT; agi,itrrÃr~?
` required ` abr classification classification of the of t.~
. isconnector 2i)0 as a hazardous material by the DOT.
[0033] In an exemplary em bo i m rent. the entirety of the housing 208 Y
cot , rises a .r<terial that becomes sufficiently weakened at a to peratuae that is lower, , than tMaie activation temperature of only the cartridge 21.2. 'alternatively o, joint in z ~
. the housin .208 or that Seal the housing 208 to the terminal studs 202, 204 and the e,lectprical ~element .~06 comprise the mate :al that e~+omes. Kw fficiently ~i~'eakened at a tui ,s..t is V r 2.ih4+ bSm ~~',i~tu. fSr~4r ~ 1~ the cart-'C
temperature that is lower than ' the activation 1Z~+ A twif?r \tS )'1 i)r_t :.
t~~ r;
e bomi3nem, taB material in the joints provides the `, 'ea.t en d structure that Prevents the rS.q g 8 -nn containing Y Y. ~15,3.~~, ~?~ .,a t).. a.~ t~ i expanding gases '~F'~o.?.i the cartridge 212.
In another alternative enibodimeKt, ti, . ousing 208 compr ses that beco-n-lo-s L'ii3G.\.a.~=u si.tffia".ie"3?ta}` tau `: ened Lit c~ ait: ',a :.hat is tY` t lower a. than the acrr tivation temperature of the cartridge 212 while the 'oiia.ts comprise a different material.
[0034"
in another exe 3`. ? ca.'':y embodiment. the housing 208 comprises at least one mater "al that melts or bums, or is sufficiently w a enedt (Wring a ..?re prior to activation of the disco. meet or's cartridge 21.2. In this embodiment, the term-Mal studs 20 204 o`Fthe disconnector 200 are gait i f.. t in a housing 208 co uprising at least te'a` melts or bi..rq~ZZaõ or is S1~~~#fÃ~~~~..,. Weakened, ~`ti F 1:a t}Ãrk~i a ~Z,_tL. ~.r _s ;C# ~Z>f to one ..x?.i4~::i a , that .Ãiat,a ti t,r... . f.~3 activation of the disconn .cto 's cartridge 21.1 Because the cartridge 212 as i.
a.=3'i+.:ca~
c c,3:iti3ai.f','d in `^ the .Ã2¾i3usinIg 208, the cf#3tiÃLa i a slower yr n se =a in ~~ 21.2 will experience tS:m.ier a.tui:-e than the housing 208 during a fire. Accordingly. \ 208 its joints) c a n coniprzsc materials that melt or bur , or are su ent]y weak vned, at P, `y t~~t is above re the e activation t+ =d t~i;~ w ~ but t1 temperature ~:>I7i~?~=F"a;iE'#.ii"c of .. t3it .;`a4 housing F..~`~s . z:.a.,~:.i; ') , ;.,.c~-~fwls me-It., .r., or . tea azyF~.i"cas t `+.~,~,.,~~ become ~~t:.a~:ik1e~ before the .u::a,C intiiZ`>i.;
Y. i disconanectà z 200 increases to the activation temperature of the cartirid e 212 to detoria e the c:,x,i"i ge 12 [0103-5] Exemplary materials suitable for the housing 2018 including tine Iits, include epoxy. PVC, other th .mio-plastic materials, or n y suitable material having. t.'~, :e melting, butt is>g, ` we kening charac .eri th:` descried.
i?"vi C:3 In, an, cxer piar- F c'inhodrmerit, the auto-;gri bbun.# poi off, the , opellurt in the cartridge 21, 2 is approximately 190 derescentigrade. Accordingly, e hour ng 4..
i 208 materials will melt, ignite, or become su fficientl weakened at a temperature that is i(= than 190 degrees centigkade, Alt? i`natively, the housing 208 .:.i i ais wiz melt.
ignite, t i weakened <
or become Sw'a'``ti%retiil~i at a t~:.FTiz-`zEu a:re t~li~t as L-,1. ,>> e 190 degrees centigrade lbut before the temperature of the cartridge 212 in the scan a~.f t 33: 20~.
re c hes 190 e r ees centigrade during a fire.
200 f003 a.
r2arc disconnector 00 accor in to the >'x; mplar ` embodiii'ie is dosetabed herein can he used with any surge To-Seer e toying s isolation functions. Additionally, the housing 208 describe(] herein c n be used with any diaconnectto. , provide a fire safe fiwi tion for such disconnector.
[00381 T r~.'a foregoing exemplary embodiments enable a fi safe arrester discon ecto . zany other modifications, fe i: es, and twilit odimgena's will become ev dent to a person of ordinary ski al in the za t having the benefit o f the present tai `Ã su i. It should be Appreciated, t1asrefore, that many aspects of the iii rear'mion were described above by way of example only and are not inter? cd required essential elements of the i 1-venti: n .. mess explicitly stated. otherwise. It should also be understood that the invention is not restricted to the illustrated ernbodimems and that =arknis modifications ca,--. be `made within, the spirit and scope of the following claims.
Claims (25)
1. An arrester disconnector comprising:
a line terminal stud;
a ground terminal stud;
an electrical element disposed between the line terminal stud and the ground terminal stud;
a disconnect cartridge having an activation temperature and disposed to disconnect at least one of the line terminal stud and the around terminal stud when activated; and a housing that encapsulates at least a portion of the line terminal stud, the ground terminal stud and the resistor, the housing becoming structurally weakened prior to activation of the cartridge when the disconnector is exposed to heat.
a line terminal stud;
a ground terminal stud;
an electrical element disposed between the line terminal stud and the ground terminal stud;
a disconnect cartridge having an activation temperature and disposed to disconnect at least one of the line terminal stud and the around terminal stud when activated; and a housing that encapsulates at least a portion of the line terminal stud, the ground terminal stud and the resistor, the housing becoming structurally weakened prior to activation of the cartridge when the disconnector is exposed to heat.
2. The disconnector of claim 1, wherein the housing comprises at least one material having at least one of a melting point and an ignition point that is lower than the activation temperature of the cartridge.
3. The disconnector of claim 2, wherein the at. least one material melts or bums when exposed to the heat at a temperature that is less than the activation temperature of the cartridge, thereby structurally weakening the housing and causing the encapsulation of the ground terminal stud by the housing to fail.
4, The disconnector of claim 1, wherein the housing comprises at least one material that becomes weakened at a temperature that is lower than the activation temperature of the cartridge.
5. The disconnector of claim 1 , wherein the bousing comprises at least one material that becomes weakened at a temperature that is higher than the activation temperature of the cartridge, and wherein a temperature of the cartridge remains less than the activation temperature until after the at least one material becomes weakened when the disconnector is exposed to beat.
6. The disconnector of claim 1, wherein the line terminal stud, the resistor, and the ground terminal stud encapsulated by the housing define a sealed chamber adjacent to the cartridge, and wherein the structural weakening of the housing destroys the sealed chamber.
7. The disconnector of claim 3 , wherein the structural weakening of the hoasing reduces an explosive effect caused by activation of the cartridge.
8. The disconnector of claim 1, wherein the cartridge comprises a propellant that ignites at the activation temperature.
9. The assembly of claim 1, wherein the disconnector is coupled to a surge arrester.
10. A surge arrester assembly, comprising:
a surge arrester; and a disconnector coupled to the surge arrester and configured to sever electrical connection of the surge arrester to ground, the disconnector comprising:
a line stud;
a ground stud;
an electrical element disposed between the line stud and the ground stud;
a disconnect cartridge having an activation temperature and disposed to disconnect at least one of the line stud and the ground stud from the disconnector when activated to thereby sever electrical connection of the surge arrester to ground: and a housing that encapsulates at least a portion of the line terminal stud, the ground terminal stud, and the resistor, the housing becoming structurally weakened prior to activation of the cartridge when the disconnector is exposed to heat.
a surge arrester; and a disconnector coupled to the surge arrester and configured to sever electrical connection of the surge arrester to ground, the disconnector comprising:
a line stud;
a ground stud;
an electrical element disposed between the line stud and the ground stud;
a disconnect cartridge having an activation temperature and disposed to disconnect at least one of the line stud and the ground stud from the disconnector when activated to thereby sever electrical connection of the surge arrester to ground: and a housing that encapsulates at least a portion of the line terminal stud, the ground terminal stud, and the resistor, the housing becoming structurally weakened prior to activation of the cartridge when the disconnector is exposed to heat.
11. The surge arrester assembly of claim 10, wherein the housing comprises at least one material having at least one of a melting point and an ignition point that is lower than the activation temperature of the cartridge.
12. The surge arrester assembly of claim 11 , wherein the at least one material melts or burns when exposed Io the heat at a temperature that is less than the activation temperature of the cartridge, thereby structurally weakening the housing and causing the encapsulation of the ground terminal stud by the housing to fail.
13. The surge arrester assembly of claim 10. wherein the housing comprises at least one material that becomes weakened at a temperature that is lower than the activation temperature of the cartridge.
14. The surge arrester assembly of claim 10. wherein the housing comprises at least one materia! that becomes weakened at a temperature that is higher than the activation temperature of the cartridge, and wherein a temperature of the cartridge remains less than the activation temperature until after the at least one material becomes weakened when the disconnector is exposed to heat.
15. The surge arrester assembly of claim 10, wherein the line stud, the resistor, and the ground stud encapsulated by the housing define a sealed chamber adjacent to the cartridge, and wherein the structural weakening of the housing destroys the sealed chamber.
16. The surge arrester assembly of claim 10. wherein the structural weakening of the housing reduces an explosive effect caused by activation of the cartridge.
17. The surge arrester assembly of claim 10, wherein the cartridge comprises a propellant that ignites at the activation temperature.
18. An arrester disconnector, comprising:
a housing: and a disconnect cartridge having an activation temperature and disposed within at least a portion of the housing, wherein the housing comprises at least one material that becomes structurally weakened prior to activation of the cartridge when the disconnector is exposed to heat.
a housing: and a disconnect cartridge having an activation temperature and disposed within at least a portion of the housing, wherein the housing comprises at least one material that becomes structurally weakened prior to activation of the cartridge when the disconnector is exposed to heat.
19. The disconnector of claim 18, wherein the housing comprises at least one material having at least one of a melting point and an ignition point that is lower than the activation temperature of the cartridge.
20. The disconnector of claim 18. wherein the housing comprises at least one material that becomes weakened at a temperature that is lower than the activation temperature of the cartridge.
21. The disconnector of claim 18, wherein the housing comprises at least one material that becomes weakened at a temperature that is higher than the activation temperature of the cartridge, and wherein a temperature of the cartridge remains less than the activation temperature until after the at least one material becomes weakened when the disconnector is exposed to heat.
22. The disconnector of claim 18, wherein the housing defines a sealed chamber adjacent to the cartridge, and wherein the structural weakening of the housing destroys the sealed chamber.
23. The disconnector of claim 18, wherein the structural weakening of the housing reduces an explosive effect caused by activation of the cartridge.
24. The disconnector of claim 18, wherein the cartridge comprises a propellant that ignites at the activation temperature.
25. The disconnector of claim 18. wherein the disconnector is coupled to a surge arrester.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/925,194 US7675728B2 (en) | 2007-10-26 | 2007-10-26 | Fire safe arrester isolator |
| US11/925,194 | 2007-10-26 | ||
| PCT/US2008/081279 WO2009055768A1 (en) | 2007-10-26 | 2008-10-27 | Fire safe arrester isolator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2703341A1 true CA2703341A1 (en) | 2009-04-30 |
| CA2703341C CA2703341C (en) | 2016-08-09 |
Family
ID=40580081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2703341A Active CA2703341C (en) | 2007-10-26 | 2008-10-27 | Fire safe arrester isolator |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US7675728B2 (en) |
| EP (1) | EP2208214A4 (en) |
| KR (1) | KR101614699B1 (en) |
| AU (1) | AU2008316572B2 (en) |
| BR (1) | BRPI0819213B1 (en) |
| CA (1) | CA2703341C (en) |
| MX (1) | MX2010004545A (en) |
| WO (1) | WO2009055768A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018203383A1 (en) * | 2018-03-07 | 2019-04-18 | Siemens Aktiengesellschaft | Disconnecting arrangement for a surge arrester, surge arrester and method for installing a surge arrester |
| CA3138542A1 (en) | 2019-04-29 | 2020-11-05 | Hubbell Incorporated | Disconnector device and overvoltage protection assembly including the same |
| CN115151982A (en) | 2019-12-20 | 2022-10-04 | 豪倍公司 | Arrester with a live-line-protected part of a circuit breaker arrangement |
| US20220077673A1 (en) | 2020-09-09 | 2022-03-10 | Abb Power Grids Switzerland Ag | Chargeless interrupter device for surge arrester |
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| US2034204A (en) * | 1935-06-05 | 1936-03-17 | Ralph R Pittman | Electrical protective device |
| US2109733A (en) * | 1937-04-26 | 1938-03-01 | Ralph R Pittman | Electrical protective device |
| US2296708A (en) * | 1939-04-21 | 1942-09-22 | Line Material Co | Circuit interrupting device |
| US2330918A (en) * | 1941-09-22 | 1943-10-05 | Ralph R Pittman | Expulsion lightning arrester |
| US2453719A (en) * | 1942-08-12 | 1948-11-16 | Electric Service Mfg Company | Excessive potential discharge device |
| US2777095A (en) * | 1953-09-30 | 1957-01-08 | Mcgraw Electric Co | Lightning arrester |
| US3291937A (en) * | 1965-10-11 | 1966-12-13 | Westinghouse Electric Corp | Explosive disconnect having the explosive means thermally and electrically isolated from resistance ignition means |
| DE2036726A1 (en) * | 1970-07-24 | 1972-01-27 | Dynamit Nobel Ag, 5210 Troisdorf | Improved effect of the pressure surge from explosive devices |
| US3644791A (en) * | 1970-07-29 | 1972-02-22 | Westinghouse Electric Corp | Lightning arrester with pressure relief means |
| US3710212A (en) * | 1971-07-29 | 1973-01-09 | Mc Graw Edison Co | Disconnector for surge arresters |
| US3702419A (en) * | 1971-09-28 | 1972-11-07 | Westinghouse Electric Corp | Lightning arrester with pressure relief means |
| US3869650A (en) * | 1973-05-30 | 1975-03-04 | Joslyn Mfg & Supply Co | Disconnector |
| US4001651A (en) * | 1975-05-05 | 1977-01-04 | Mcgraw-Edison Company | Station lightning arrester with dual rupture diaphragms for gas pressure release |
| US4204238A (en) * | 1978-02-06 | 1980-05-20 | General Electric Company | Surge voltage lightning arresters |
| US4397919A (en) * | 1979-03-22 | 1983-08-09 | Standard Oil Company | Explosion resistant battery cells |
| US4282557A (en) * | 1979-10-29 | 1981-08-04 | General Electric Company | Surge voltage arrester housing having a fragible section |
| US4320432A (en) * | 1979-12-03 | 1982-03-16 | San Angelo Electric Service Company | High voltage transformer bushing fuse and arrester arrangement |
| US4404614A (en) * | 1981-05-15 | 1983-09-13 | Electric Power Research Institute, Inc. | Surge arrester having a non-fragmenting outer housing |
| US4471402A (en) * | 1982-02-01 | 1984-09-11 | Joslyn Mfg. And Supply Co. | Disconnector for surge arrester |
| US4656555A (en) * | 1984-12-14 | 1987-04-07 | Harvey Hubbell Incorporated | Filament wrapped electrical assemblies and method of making same |
| US4663692A (en) * | 1985-06-27 | 1987-05-05 | Westinghouse Electric Corp. | Electrical surge arrester and disconnector |
| US4609902A (en) * | 1985-10-03 | 1986-09-02 | Harvey Hubbell Incorporated | Arrester support and disconnector structure |
| US4734823A (en) * | 1985-11-01 | 1988-03-29 | Joslyn Corporation | Fault current interrupter and explosive disconnector for surge arrester |
| US4930039A (en) * | 1989-04-18 | 1990-05-29 | Cooper Industries, Inc. | Fail-safe surge arrester |
| US4975797A (en) * | 1989-08-16 | 1990-12-04 | Cooper Industries, Inc. | Arrester with external isolator |
| US5369955A (en) * | 1990-07-25 | 1994-12-06 | Thiokol Corporation | Gas generator and method for making same for hazard reducing venting in case of fire |
| US5113167A (en) * | 1991-02-15 | 1992-05-12 | Hubbell Incorporated | Lightning arrester isolator |
| US5594613A (en) * | 1992-10-09 | 1997-01-14 | Cooper Industries, Inc. | Surge arrester having controlled multiple current paths |
| US5434550A (en) * | 1994-04-07 | 1995-07-18 | Hubbell Incorporated | Arrester disconnector |
| DE19701857C2 (en) * | 1997-01-21 | 2001-09-06 | Oetiker Hans Maschinen | Slotted mounting ring |
| SE511325C3 (en) * | 1997-04-07 | 1999-09-13 | Abb Ab | Connection is provided with a power cable and procedure for connecting a power cable |
| US5952910A (en) * | 1997-12-04 | 1999-09-14 | Hubbell Incorporated | Isolator device for arrester |
| US6519129B1 (en) * | 1999-11-02 | 2003-02-11 | Cooper Industries, Inc. | Surge arrester module with bonded component stack |
| US6667871B2 (en) * | 2001-02-16 | 2003-12-23 | Hubbell Incorporated | Arrester housing with weak section |
| US6657842B2 (en) * | 2002-01-22 | 2003-12-02 | Hubbell Incorporated | Disconnector assembly for an arrestor |
| US6887942B2 (en) * | 2003-04-11 | 2005-05-03 | Chung Shan Instruments Co., Ltd. | Low softening temperature thermal conductive adhesive composition |
| US6828895B1 (en) * | 2003-05-29 | 2004-12-07 | Hubbel Incorporated | Arrester disconnector assembly having a capacitor and a resistor |
| US6876289B2 (en) * | 2003-05-29 | 2005-04-05 | Hubbell Incorporated | Arrester disconnector assembly having a capacitor |
| WO2006081193A2 (en) * | 2005-01-25 | 2006-08-03 | Cooper Technologies Company | Insulator for energized terminal of electrical device |
| US7656639B2 (en) * | 2006-06-22 | 2010-02-02 | Cooper Technologies Company | Retainer for surge arrester disconnector |
| US20080068122A1 (en) * | 2006-09-15 | 2008-03-20 | Hubbell Incorporated | Arrester Disconnector Assembly Minimizing Explosive Separation |
-
2007
- 2007-10-26 US US11/925,194 patent/US7675728B2/en active Active
-
2008
- 2008-10-27 MX MX2010004545A patent/MX2010004545A/en active IP Right Grant
- 2008-10-27 BR BRPI0819213A patent/BRPI0819213B1/en active IP Right Grant
- 2008-10-27 WO PCT/US2008/081279 patent/WO2009055768A1/en active Application Filing
- 2008-10-27 KR KR1020107010803A patent/KR101614699B1/en active IP Right Grant
- 2008-10-27 AU AU2008316572A patent/AU2008316572B2/en active Active
- 2008-10-27 CA CA2703341A patent/CA2703341C/en active Active
- 2008-10-27 EP EP08842287.8A patent/EP2208214A4/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| CA2703341C (en) | 2016-08-09 |
| KR20100077028A (en) | 2010-07-06 |
| US7675728B2 (en) | 2010-03-09 |
| MX2010004545A (en) | 2010-05-05 |
| BRPI0819213B1 (en) | 2019-01-15 |
| EP2208214A1 (en) | 2010-07-21 |
| WO2009055768A1 (en) | 2009-04-30 |
| AU2008316572A1 (en) | 2009-04-30 |
| KR101614699B1 (en) | 2016-04-22 |
| AU2008316572B2 (en) | 2013-08-01 |
| EP2208214A4 (en) | 2018-04-04 |
| US20090109592A1 (en) | 2009-04-30 |
| BRPI0819213A2 (en) | 2015-05-05 |
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| EEER | Examination request |
Effective date: 20131024 |