CN102891475B - Three-phase automatic switch - Google Patents
Three-phase automatic switch Download PDFInfo
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- CN102891475B CN102891475B CN201210381652.5A CN201210381652A CN102891475B CN 102891475 B CN102891475 B CN 102891475B CN 201210381652 A CN201210381652 A CN 201210381652A CN 102891475 B CN102891475 B CN 102891475B
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Abstract
The invention provides a three-phase automatic switch comprising a switch shell, a three-phase switch, an upper cover of the switch shell, an electronic component plate and an automatic switch control circuit, wherein the three-phase switch is arranged in the switch shell; the upper cover of the switch shell is buckled with the switch shell; the automatic switch control circuit is arranged on the electronic component plate; the three-phase switch comprises a switch-on and switch-off tripling device, an operating handle connected with the switch-on and switch-off tripling device, a zero sequence current mutual inductor, three annular voltage transformers, a three-phase switch moving/fixing contact and a switch shell base arranged at the bottom of the switch shell; and the automatic switch control circuit comprises a power circuit, an earth leakage protection circuit and three conjunction gate circuits. The three-phase automatic switch has the advantages of scientific design, strong practicability, safety, reliability, low manufacturing cost and long service life.
Description
Technical field
The present invention relates to a kind of threephase switch, specifically, relate to a kind of can from the three-phase automatic switch of dynamic circuit breaker lock.
Background technology
Three-phase automatic switch, as a kind of low voltage equipment, is widely used in threephase motor or three-phase branch circuit, makes the infrequently break-make of infrequently startup or circuit, only has short circuit, overcurrent protection in running therebetween.And actual motion is in threephase motor circuit, also need to increase open-phase protection, leakage protection equipment, cause protective circuit installation wiring complicated.Afterwards, people was had to add creepage protection function in the nonstandard three-phase automatic switch housing of DZ15, but; in actual motion, under portions of electronics element is often operated in 380V voltage between lines, portions of electronics element is caused frequently to burn; reliability extreme difference, does not reach the object of anticipation.
In order to solve above Problems existing, people are seeking a kind of desirable technical solution always.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, thus a kind of design science is provided, practical, safe and reliable, production cost is low and the three-phase automatic switch of long service life.
To achieve these goals, the technical solution adopted in the present invention is: a kind of three-phase automatic switch, and it comprises switch case, the threephase switch be arranged in described switch case, the switch case upper cover engaged with described switch case, electric sub-member plate and the automatic switch control circuit that is arranged on described electric sub-member plate;
Wherein, described threephase switch comprises divide-shut brake trip gear, zero sequence current mutual inductor, three annular voltage transformers and threephase switch dynamic/static contact, described divide-shut brake trip gear is connected with three short circuit overcurrent releases and an assistant release, described assistant release comprises assistant release coil TQ, one end of three described short circuit overcurrent releases connects one end of described threephase switch dynamic/static contact respectively, the other end of described threephase switch dynamic/static contact is as power access end, the other end of three described short circuit overcurrent releases connects one end of described zero sequence current mutual inductor primary side jointly, the other end of described zero sequence current mutual inductor primary side connects one end of three described annular voltage transformer primary sides respectively, the other end of three described annular voltage transformer primary sides is respectively as power output end, one end ground connection of described zero sequence current mutual inductor secondary side, one end of three described annular voltage transformer secondary sides links together,
Described automatic switch control circuit comprises power circuit, leakage protection circuit and three AND circuit, wherein, described power circuit comprises three-phase bridge rectification diode, described three-phase bridge rectification diode comprises diode V1, diode V2, diode V3, diode V4, diode V5 and diode V6, the anode of described diode V1, the anode of described diode V2, the anode of described diode V3 connects the other end of three described annular voltage transformer secondary sides successively, the negative electrode of described diode V4, the negative electrode of described diode V5, the negative electrode of described diode V6 connects the other end of three described annular voltage transformer secondary sides successively, the negative electrode of described diode V1, the negative electrode of described diode V2, the negative electrode of described diode V3 links together as power output end VCC, the anode of described diode V4, the anode of described diode V5, the anode ground connection respectively of described diode V6,
Described leakage protection circuit comprises adjustable resistance R6, unidirectional thyristor VT2, electric capacity C5, assistant release coil TQ and test button AN1, one end of described adjustable resistance R6 is connected with the other end of described zero sequence current mutual inductor secondary side, the other end of described adjustable resistance R6 is connected with the control pole of described unidirectional thyristor VT2, the other end of described adjustable resistance R6 is connected with one end of described electric capacity C5 simultaneously, the other end of described electric capacity C5 and the negative electrode of described unidirectional thyristor VT2 ground connection respectively, the anode of described unidirectional thyristor VT2 is connected with one end of described assistant release coil TQ and one end of described test button AN1 respectively, the other end of described assistant release coil TQ is connected with described power output end VCC, the other end of described test button AN1 connects the negative electrode of described unidirectional thyristor VT2,
Described three AND circuit comprise rectifier diode V7, rectifier diode V8, rectifier diode V9, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electrolytic capacitor C1, electrolytic capacitor C2, electrolytic capacitor C3, electrolytic capacitor C4, triode V10, triode V11, triode V12 and single-phase thyristor VT1, wherein, the anode of described rectifier diode V7, the anode of described rectifier diode V8, the anode of described rectifier diode V9 connects the other end of three described annular voltage transformer secondary sides successively, the negative electrode of described rectifier diode V7 is connected with one end of described resistance R1, the other end of described resistance R1 is connected with the positive pole of described electrolytic capacitor C1, the other end of described resistance R1 is connected with the base stage of described triode V10 simultaneously, the minus earth of described electrolytic capacitor C1, the negative electrode of described rectifier diode V8 is connected with one end of described resistance R2, the other end of described resistance R2 is connected with the positive pole of described electrolytic capacitor C2, the other end of described resistance R2 is connected with the base stage of described triode V11 simultaneously, the minus earth of described electrolytic capacitor C2, the negative electrode of described rectifier diode V9 is connected with one end of described resistance R3, the other end of described resistance R3 is connected with the positive pole of described electrolytic capacitor C3, the other end of described resistance R3 is connected with the base stage of described triode V12 simultaneously, the minus earth of described electrolytic capacitor C3, the collector electrode of described triode V10 is connected with one end of described resistance R4, the other end of described resistance R4 is connected with described power output end VCC, the collector electrode of described triode V11 is connected with the emitter of described triode V10, the collector electrode of described triode V12 is connected with the emitter of described triode V11, the grounded emitter of described triode V12, one end of described resistance R5 is connected with the collector electrode of described triode V10, the other end of described resistance R5 is connected with the positive pole of described electrolytic capacitor C4, the minus earth of described electrolytic capacitor C4, the positive pole of described electrolytic capacitor C4 is connected with the control pole of described single-phase thyristor VT1, the anode of described single-phase thyristor VT1 is connected with one end of described assistant release coil TQ, the minus earth of described single-phase thyristor VT1.
Based on above-mentioned, described switch case cover and is provided with operating grip, be connected with described divide-shut brake trip gear bottom described operating grip.
Based on above-mentioned, described switch case is provided with three phase connection, the other end of described threephase switch dynamic/static contact connects described three phase connection, switch case base is provided with bottom described switch case, described switch case base is provided with three-phase terminal, and the other end of three described annular voltage transformer primary sides connects described three-phase terminal respectively.
Based on above-mentioned, described switch case cover and is provided with test button, described test button is connected with described test button AN1.
Based on above-mentioned, described switch case cover and is provided with transparent windows.
Hinge structure of the present invention has outstanding substantive distinguishing features and marked improvement, specifically, the present invention is different by traditional threephase switch, it increases automatic switch control circuit, described automatic switch control circuit comprises power circuit, leakage protection circuit and three AND circuit, when occurring short circuit, electric leakage, during the faults such as phase shortage, described automatic switch control control circui divide-shut brake trip gear, three short circuit overcurrent releases and an assistant release action, complete the disconnected lock of threephase switch, substantially increase switch safety, simultaneously, efficiently solve increase open-phase protection, leakage protection equipment, cause protective circuit that the complicated problem of wiring is installed, it has design science, practical, safe and reliable, production cost is low and the advantage of long service life.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of described switch case upper cover.
Fig. 3 is the schematic diagram of automatic switch control circuit of the present invention.
Embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
As shown in Figure 1, Figure 2 and Figure 3, a kind of three-phase automatic switch, it comprises switch case 1, the threephase switch be arranged in described switch case 1, the switch case upper cover 2 engaged with described switch case 1, electric sub-member plate 4 and the automatic switch control circuit that is arranged on described electric sub-member plate 4;
Wherein, described threephase switch comprises divide-shut brake trip gear 5, zero sequence current mutual inductor 6, three annular voltage transformers 7 and threephase switch dynamic/static contact 52, described divide-shut brake trip gear 5 is connected with three short circuit overcurrent releases 51 and an assistant release 53, described assistant release 53 comprises assistant release coil TQ, one end of three described short circuit overcurrent releases 51 connects one end of described threephase switch dynamic/static contact 52 respectively, the other end of described threephase switch dynamic/static contact 52 is as power access end, the other end of three described short circuit overcurrent releases 51 connects one end of described zero sequence current mutual inductor 6 primary side jointly, the other end of described zero sequence current mutual inductor 6 primary side connects one end of three described annular voltage transformer 7 primary sides respectively, the other end of three described annular voltage transformer 7 primary sides is respectively as power output end, one end ground connection of described zero sequence current mutual inductor 6 secondary side, one end of three described annular voltage transformer 7 secondary sides links together,
Described automatic switch control circuit comprises power circuit, leakage protection circuit and three AND circuit, wherein, described power circuit comprises three-phase bridge rectification diode, and described three-phase bridge rectification diode comprises diode V1, diode V2, diode V3, diode V4, diode V5 and diode V6, wherein, three described annular voltage transformer 7 second siding rings are respectively coil PT1, coil PT2 and coil PT3, one end of described coil PT1, one end of coil PT2 and one end of coil PT3 link together, the anode of described diode V1, the negative electrode of described diode V4 is connected with the other end of described coil PT3, the anode of described diode V2, the negative electrode of described diode V5 is connected with the other end of described coil PT2, the anode of described diode V3, the negative electrode of described diode V6 is connected with the other end of described coil PT1, is connected with the other end of described coil PT3, the negative electrode of described diode V1, the negative electrode of described diode V2, the negative electrode of described diode V3 links together as power output end VCC, the anode of described diode V4, the anode of described diode V5, the anode ground connection respectively of described diode V6,
Described leakage protection circuit comprises adjustable resistance R6, unidirectional thyristor VT2, electric capacity C5, assistant release coil TQ and test button AN1, described zero sequence current mutual inductor second siding ring is coil CCL1, described coil CCL1 one end ground connection, one end of described adjustable resistance R6 is connected with the other end of described coil CCL1, the other end of described adjustable resistance R6 is connected with one end of the control pole of described unidirectional thyristor VT2 and described electric capacity C5, the other end of described electric capacity C5 and the minus earth of described unidirectional thyristor VT2, the anode of described unidirectional thyristor VT2 is connected with one end of described assistant release coil TQ and one end of described test button AN1 respectively, the other end of described assistant release coil TQ is connected with described power output end VCC, the other end of described test button AN1 connects the negative electrode of described unidirectional thyristor VT2,
Described three AND circuit comprise rectifier diode V7, rectifier diode V8, rectifier diode V9, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electrolytic capacitor C1, electrolytic capacitor C2, electrolytic capacitor C3, electrolytic capacitor C4, triode V10, triode V11, triode V12 and single-phase thyristor VT1, wherein, the anode of described rectifier diode V7, the anode of described rectifier diode V8, the anode of described rectifier diode V9 connects the other end of three described annular voltage transformer secondary sides respectively, the negative electrode of described rectifier diode V7 is connected with one end of described resistance R1, the other end of described resistance R1 is connected with the base stage of the positive pole of described electrolytic capacitor C1 and described triode V10, the minus earth of described electrolytic capacitor C1, the negative electrode of described rectifier diode V8 is connected with one end of described resistance R2, the other end of described resistance R2 is connected with the base stage of the positive pole of described electrolytic capacitor C2 and described triode V11, the minus earth of described electrolytic capacitor C2, the negative electrode of described rectifier diode V9 is connected with one end of described resistance R3, the other end of described resistance R3 is connected with the base stage of the positive pole of described electrolytic capacitor C3 and described triode V12, the minus earth of described electrolytic capacitor C3, the collector electrode of described triode V10 is connected with one end of described resistance R4, the other end of described resistance R4 is connected with described power output end VCC, the collector electrode of described triode V11 is connected with the emitter of described triode V10, the collector electrode of described triode V12 is connected with the emitter of described triode V11, the grounded emitter of described triode V12, one end of described resistance R5 is connected with the collector electrode of described triode V10, the other end of described resistance R5 is connected with the positive pole of described electrolytic capacitor C4, the minus earth of described electrolytic capacitor C4, the positive pole of described electrolytic capacitor C4 is connected with the control pole of described single-phase thyristor VT1, the anode of described single-phase thyristor VT1 is connected with one end of described assistant release coil TQ, the minus earth of described single-phase thyristor VT1.
Based on above-mentioned, described resistance R1, described resistance R2, described resistance R3, described electrolytic capacitor C1, described electrolytic capacitor C2 and described electrolytic capacitor C3 form the gate voltage current rectifying and wave filtering circuit of three AND circuit.
Based on above-mentioned, described electrolytic capacitor C4, described triode V10, described triode V11 and described triode V12 form three AND circuit of three AND circuit.
Based on above-mentioned, described resistor R5, described triode V10 and described electrolytic capacitor C4 form the time delay of the output circuit of three AND circuit.
Based on above-mentioned, described single-phase thyristor VT1, described capacitor C4 and described assistant release coil TQ form the executive circuit of three AND circuit.
Based on above-mentioned, conveniently operate, described switch case upper cover 2 is provided with operating grip 23, be connected with described divide-shut brake trip gear 5 bottom described operating grip 23.
Based on above-mentioned, in described switch case, 1 is provided with three phase connection 11, the other end of described threephase switch dynamic/static contact 52 connects described three phase connection 11, described three phase connection 11 is as power access end, switch case base 3 is provided with bottom described switch case 1, described switch case base 3 is provided with three-phase terminal 31, the other end of three described annular voltage transformer 7 primary sides connects described three-phase terminal 31 respectively, described three-phase terminal 31, as power output end, facilitates this this three-phase automatic switch wiring.
Based on above-mentioned, the conveniently test of this three-phase automatic switch, described switch case upper cover 2 is provided with test button 22, described test button 22 is connected with described test button AN1.
Based on above-mentioned, conveniently observe the inner case of this three-phase automatic switch, described switch case upper cover 2 is provided with transparent windows 21.
When this three-phase automatic switch specifically uses: before this three-phase automatic switch comes into operation, carry out test operation, first upwards pull operating grip 23, connection contactor runs, press described test button 22 to detect, if switch trip is out of service, then this three-phase automatic switch can normally be run.Cleaning Principle: press described test button 22 and be namely equivalent to short circuit thyristor VT2 anode and negative electrode, connected assistant release coil TQ, cause assistant release 53 to be threaded off, thus make divide-shut brake trip gear 5 action, switch trip is out of service.
Tried switch can come into operation, and now first should pull operating grip 23 downwards and make assistant release 53 snap close, more upwards operating grip 23 makes threephase switch to close a floodgate normal operation input again.
When short circuit overcurrent fault appears in circuit, three short circuit overcurrent release 51 actions simultaneously, under armature is inhaled, promote divide-shut brake trip gear 5 and trip, play short circuit overcurrent protective effect.
When there is leak current fault in circuit; described zero sequence current mutual inductor second siding ring CCL1 exports a leakage current signal; this leakage current signal, through adjustable resistance R6 current limliting, after electric capacity C5 removes high-frequency interferencing signal, is applied to thyristor VT2 and controls pole and negative electrode two ends; trigger thyristor VT2 conducting; connect assistant release coil TQ, caused assistant release 53 to be threaded off, thus make divide-shut brake trip gear 5 action; switch trip is out of service, realizes creepage protection function.
Default-phase protection function: under normal circumstances, threephase switch is connected, three-phase line load loop current forms current circuit respectively by the primary side of three annular voltage transformers 7, now, will certainly at the second siding ring PT1 of three annular voltage transformers 7, coil PT2 and coil PT3 forms induced voltage, this induced voltage is applied on three-phase bridge rectification diode, by power output end VCC for described assistant release coil TQ provides working power, this induced voltage is applied to rectifier diode V7 simultaneously, rectifier diode V8, on rectifier diode V9, through resistance R1, resistance R2, resistance R3 current limliting, through electrolytic capacitor C1, electrolytic capacitor C2, after electrolytic capacitor C3 filtering, be input to the base stage of described triode V10 respectively, the base stage of described triode V11, the base stage of described triode V12, through described triode V10, out gate electrode potential after described triode V11 and described triode V12, make to state triode V10, described triode V11 and described triode V12 is in saturation conduction state, now, the output of three AND circuit of three AND circuit is electronegative potential, it is also electronegative potential that thyristor VT1 in the executive circuit of described three AND circuit controls pole, cannot conducting, circuit is in normal operating conditions.
When there is open-phase fault in circuit, namely three-phase electricity source comprise three-phase line load current circuit arbitrarily mutually occur broken string open-phase fault time, such as: the three-phase in power supply is a phase broken string phase shortage wherein, the second siding ring PT1 of three annular voltage transformers 7 certainly will be caused, coil PT2 and coil PT3 cannot export one of them, cause described triode V10, one of them input of described triode V11 and described triode V12 is electronegative potential, and then cause described triode V10, one of them cut-off of described triode V11 and described triode V12, the output of three AND circuit of three AND circuit is high potential, charge to electrolytic capacitor C4 through resistor R5, its charging process is time delay process (about 1 second), along with the reduction gradually of charging current, described triode V10, one of them control electrode potential of described triode V11 and described triode V12 increases gradually, described thyristor VT1 conducting, connect assistant release coil TQ, assistant release 53 is caused to be threaded off, thus make divide-shut brake trip gear 5 action, switch trip is out of service, complete open-phase protection holding function.
Shown by above-described embodiment analysis: the highly reliable Multifunctional three-phase automatic switch adopting the method to make, have that defencive function is complete, reliability is high, stable performance, economical and practical, relatively extend the outstanding advantages such as the useful life of product.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (5)
1. a three-phase automatic switch, is characterized in that: it comprises switch case, the threephase switch be arranged in described switch case, the switch case upper cover engaged with described switch case, electric sub-member plate and the automatic switch control circuit that is arranged on described electric sub-member plate;
Wherein, described threephase switch comprises divide-shut brake trip gear, zero sequence current mutual inductor, three annular voltage transformers and threephase switch dynamic/static contact, described divide-shut brake trip gear is connected with three short circuit overcurrent releases and an assistant release, described assistant release comprises assistant release coil TQ, one end of three described short circuit overcurrent releases connects one end of described threephase switch dynamic/static contact respectively, the other end of described threephase switch dynamic/static contact is as power access end, the other end of three described short circuit overcurrent releases connects one end of described zero sequence current mutual inductor primary side jointly, the other end of described zero sequence current mutual inductor primary side connects one end of three described annular voltage transformer primary sides respectively, the other end of three described annular voltage transformer primary sides is respectively as power output end, one end ground connection of described zero sequence current mutual inductor secondary side, one end of three described annular voltage transformer secondary sides links together,
Described automatic switch control circuit comprises power circuit, leakage protection circuit and three AND circuit, wherein, described power circuit comprises three-phase bridge rectification diode, described three-phase bridge rectification diode comprises diode V1, diode V2, diode V3, diode V4, diode V5 and diode V6, the anode of described diode V1, the anode of described diode V2, the anode of described diode V3 connects the other end of three described annular voltage transformer secondary sides successively, the negative electrode of described diode V4, the negative electrode of described diode V5, the negative electrode of described diode V6 connects the other end of three described annular voltage transformer secondary sides successively, the negative electrode of described diode V1, the negative electrode of described diode V2, the negative electrode of described diode V3 links together as power output end VCC, the anode of described diode V4, the anode of described diode V5, the anode ground connection respectively of described diode V6,
Described leakage protection circuit comprises adjustable resistance R6, unidirectional thyristor VT2, electric capacity C5, assistant release coil TQ and test button AN1, one end of described adjustable resistance R6 is connected with the other end of described zero sequence current mutual inductor secondary side, the other end of described adjustable resistance R6 is connected with the control pole of described unidirectional thyristor VT2, the other end of described adjustable resistance R6 is connected with one end of described electric capacity C5 simultaneously, the other end of described electric capacity C5 and the negative electrode of described unidirectional thyristor VT2 ground connection respectively, the anode of described unidirectional thyristor VT2 is connected with one end of described assistant release coil TQ and one end of described test button AN1 respectively, the other end of described assistant release coil TQ is connected with described power output end VCC, the other end of described test button AN1 connects the negative electrode of described unidirectional thyristor VT2,
Described three AND circuit comprise rectifier diode V7, rectifier diode V8, rectifier diode V9, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electrolytic capacitor C1, electrolytic capacitor C2, electrolytic capacitor C3, electrolytic capacitor C4, triode V10, triode V11, triode V12 and single-phase thyristor VT1, wherein, the anode of described rectifier diode V7, the anode of described rectifier diode V8, the anode of described rectifier diode V9 connects the other end of three described annular voltage transformer secondary sides successively, the negative electrode of described rectifier diode V7 is connected with one end of described resistance R1, the other end of described resistance R1 is connected with the positive pole of described electrolytic capacitor C1, the other end of described resistance R1 is connected with the base stage of described triode V10 simultaneously, the minus earth of described electrolytic capacitor C1, the negative electrode of described rectifier diode V8 is connected with one end of described resistance R2, the other end of described resistance R2 is connected with the positive pole of described electrolytic capacitor C2, the other end of described resistance R2 is connected with the base stage of described triode V11 simultaneously, the minus earth of described electrolytic capacitor C2, the negative electrode of described rectifier diode V9 is connected with one end of described resistance R3, the other end of described resistance R3 is connected with the positive pole of described electrolytic capacitor C3, the other end of described resistance R3 is connected with the base stage of described triode V12 simultaneously, the minus earth of described electrolytic capacitor C3, the collector electrode of described triode V10 is connected with one end of described resistance R4, the other end of described resistance R4 is connected with described power output end VCC, the collector electrode of described triode V11 is connected with the emitter of described triode V10, the collector electrode of described triode V12 is connected with the emitter of described triode V11, the grounded emitter of described triode V12, one end of described resistance R5 is connected with the collector electrode of described triode V10, the other end of described resistance R5 is connected with the positive pole of described electrolytic capacitor C4, the minus earth of described electrolytic capacitor C4, the positive pole of described electrolytic capacitor C4 is connected with the control pole of described single-phase thyristor VT1, the anode of described single-phase thyristor VT1 is connected with one end of described assistant release coil TQ, the minus earth of described single-phase thyristor VT1.
2. three-phase automatic switch according to claim 1, is characterized in that: described switch case covers and is provided with operating grip, is connected bottom described operating grip with described divide-shut brake trip gear.
3. three-phase automatic switch according to claim 1 and 2, it is characterized in that: described switch case is provided with three phase connection, the other end of described threephase switch dynamic/static contact connects described three phase connection, switch case base is provided with bottom described switch case, described switch case base is provided with three-phase terminal, and the other end of three described annular voltage transformer primary sides connects described three-phase terminal respectively.
4. three-phase automatic switch according to claim 3, is characterized in that: described switch case covers and is provided with test button, and described test button is connected with described test button AN1.
5. three-phase automatic switch according to claim 4, is characterized in that: described switch case covers and is provided with transparent windows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210381652.5A CN102891475B (en) | 2012-10-10 | 2012-10-10 | Three-phase automatic switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210381652.5A CN102891475B (en) | 2012-10-10 | 2012-10-10 | Three-phase automatic switch |
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| CN102891475A CN102891475A (en) | 2013-01-23 |
| CN102891475B true CN102891475B (en) | 2015-02-18 |
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| CN201210381652.5A Expired - Fee Related CN102891475B (en) | 2012-10-10 | 2012-10-10 | Three-phase automatic switch |
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| CN102891475A (en) | 2013-01-23 |
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Effective date of registration: 20180524 Address after: 454950 eastern section of Chuang Road, Wuzhi industrial agglomeration area, Jiaozuo, Henan Patentee after: Cable Polytron Technologies Inc. Address before: 451162 electric power company on the west side of Xingang road in Zhengzhou, Henan. Patentee before: HENAN KAIQI POWER INDUSTRY Co.,Ltd. |
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