CN102005274A - Neutral point direct current (DC) magnetic bias suppression resistor of transformer - Google Patents
Neutral point direct current (DC) magnetic bias suppression resistor of transformer Download PDFInfo
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- CN102005274A CN102005274A CN 201010276344 CN201010276344A CN102005274A CN 102005274 A CN102005274 A CN 102005274A CN 201010276344 CN201010276344 CN 201010276344 CN 201010276344 A CN201010276344 A CN 201010276344A CN 102005274 A CN102005274 A CN 102005274A
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- resistor
- neutral point
- transformer
- magnetic biasing
- transformer neutral
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Abstract
The invention relates to a neutral point direct current (DC) magnetic bias suppression resistor of a transformer. The neutral point (DC) magnetic bias suppression resistor comprises a plurality of resistances arranged in a tank body, a current monitor and a pair of graphite spheres, wherein each resistance is formed by winding, welding and connecting resistance chips made of nickel chromium alloy or nickel chromium aluminum alloy in serials, each resistor chip is provided with a hole and is connected in series to a connecting rod, the connecting rod is fixed on an insulating support frame, and both ends of the resistor are connected in parallel with a pair of the graphite sphere gaps; the resistor is formed by connecting the plurality of the resistances in serials; and the current monitor comprises a current monitoring meter. By additionally arranging small resistances to the neutral point of the transformer, the resistor of the invention can effectively restrict the direct current flowing through the neutral point of the master transformer and has small and controllable influence on a transformer body and the system. Besides, the resistor of the invention has simple operating mode, can be connected with small reactors at the neutral point in serials and simultaneously ensures that the problem of restrictions on direct current and single-phase short-circuit current is solved. By connecting small resistances in series to the neutral point of the transformer, the invention has the advantages that the influence of DC magnetic bias can be effectively inhibited and the transformer is prevented from the increase of vibration, noise and loss caused by magnetic bias.
Description
Technical field
The present invention relates to the electric power system transformer, relate to the earthy resistor of transformer neutral point that electric power system suppresses D.C. magnetic biasing, be specifically related to a kind of transformer neutral point D.C. magnetic biasing suppression resistor.
Background technology
Existing both at home and abroad at present part suppresses the method for direct current, and as employing reverse current penalty method, but control is complicated, poor reliability in service, malfunction easily; Adopt electric capacity every straight method, it is bigger to the primary equipment influence, the overvoltage level height, and short circuit current is big, and device itself and systematic influence are also comparatively complicated, and can not install simultaneously with the little reactance of neutral point of restriction single-phase short circuit current.
In view of this, seek a kind of transformer neutral point D.C. magnetic biasing suppression resistor and become pursuing one's goal of these those skilled in the art.
Summary of the invention
Task of the present invention provides a kind of transformer neutral point D.C. magnetic biasing suppression resistor, it has solved above-mentioned existing in prior technology problem, at transformer neutral point by sealing in small resistor, can effectively suppress the influence of D.C. magnetic biasing, prevent that vibration strengthens transformer, noise increases, loss increases because of magnetic bias causes.
Technical solution of the present invention is as follows:
A kind of transformer neutral point D.C. magnetic biasing suppression resistor comprises the resistance, current surveillance instrument and a pair of graphite nodule that are arranged in the casing;
Described resistor comprises some resistance, and resistance is also welded by nichrome or the coiling of nichrome aluminum alloy resistor disc and is in series, and perforate is serially connected on the connecting rod on the resistor disc, and connecting rod is fixed on the insulative support frame, a pair of graphite nodule in parallel crack, resistor two ends;
Described resistor is formed in parallel by some resistance string;
Described current surveillance instrument comprises the current surveillance meter.
Be provided with insulated porcelain sleeve or insulation mica between the described resistor disc.
Described framework is an insulating material.
Described framework is the metal material that insulating material wraps.
Described resistor two ends one group of lightning arrester also in parallel.
Described transformer neutral point D.C. magnetic biasing suppression resistor also comprises the insulation isolation ward, is arranged in the casing, and graphite nodule, lightning arrester and miscellaneous part are isolated.
Described insulative support frame is fixed in the casing by porcelain insulator or synthetic insulator.
Described current surveillance instrument also comprises current sensor or current transformer,
The display floater of described current surveillance meter is arranged on the cabinet panel.
Described casing is provided with the entrance bushing and the outlet sleeve pipe of insulation.
Adopt transformer neutral point to install small resistor additional and can effectively limit the direct current that flows through the main transformer neutral point, and it is little and controlled to transformer body and systematic influence, its operational mode is simple, can be installed in series with the little reactance of neutral point, solves the problem of restriction direct current and single-phase short circuit current simultaneously.
The present invention by sealing in small resistor, can effectively suppress the influence of D.C. magnetic biasing at transformer neutral point, prevents that vibration strengthens transformer, noise increases, loss increases because of magnetic bias causes.
The present invention is by installing ball discharge crack and/or lightning arrester in resistor, energy protective resistor overvoltage is damaged and the shunting fault current flows through resistor.In addition, direct current monitoring arrangement and resistor faulty indication instrument are installed in the resistor, can in time drop into resistor and withdraw from the resistor operation.
Description of drawings
Fig. 1 is the schematic diagram of transformer neutral point D.C. magnetic biasing suppression resistor of the present invention.
Fig. 2 is the cutaway view of a kind of transformer neutral point D.C. magnetic biasing suppression resistor of the present invention.
Reference numeral:
1 is resistor, and 2 is the current surveillance instrument, and 3 is graphite nodule, and 4 is lightning arrester, and 5 is casing, and 6 is entrance bushing, and 7 is resistance, and 8 is the current surveillance meter, and 9 are the insulation isolation ward, and 10 is insulative support frame, and 11 is the graphite nodule crack, and 12 are the outlet sleeve pipe.
Embodiment
Below in conjunction with drawings and Examples the present invention is elaborated.
Referring to Fig. 1 and Fig. 2, the invention provides a kind of transformer neutral point D.C. magnetic biasing suppression resistor, form by resistor 1, current surveillance instrument 2, graphite nodule 3, lightning arrester 4, casing 5, entrance bushing 6, resistance 7, current surveillance meter 8, insulation isolation ward 9, insulative support frame 10, graphite nodule crack 11 and outlet sleeve pipe 12.
Wherein, resistor 1, graphite nodule 3, lightning arrester 4, insulation isolation ward 9, insulative support frame 10, all be arranged in the casing 5.Resistor 1 comprises some resistance 7, and resistance 7 is also welded by nichrome or the coiling of nichrome aluminum alloy resistor disc and is in series, and perforate is serially connected on the connecting rod on the resistor disc, and connecting rod is fixed on the insulative support frame 10; Just resistance 7 is fixed on the insulative support frame 10.A pair of graphite nodule in parallel crack, resistor 1 two ends 11.Current surveillance instrument 2 is connected on resistor 1 to the lead collar tube loop.Resistor 1 is made up of some resistance 7 connection in series-parallel.
Resistor 1 two ends can one group of lightning arrester 4 in parallel according to the overvoltage needs.Insulation isolation ward 9 is arranged in the casing 5, and graphite nodule 3, lightning arrester 4 are isolated with miscellaneous part.Be provided with insulated porcelain sleeve or insulation mica between the resistor disc.Support frame 10 is insulating material.The insulating material that framework 10 also can wrap in order to metal material.Insulative support frame 10 is fixed in the casing 5 by porcelain insulator or synthetic insulator.
Current surveillance instrument 2 comprises current surveillance meter 8 and current sense (induction) device or current transformer, and the display floater of this current surveillance meter 8 is arranged on casing 5 panels.Entrance bushing 6 and outlet sleeve pipe 12 are set on the casing 5.
In actual the use, transformer neutral point small resistor among the present invention adopts nichrome or the coiling of nickel chromium triangle aluminium resistor disc and welding to be in series, adopt insulator or mica insulation between the resistor disc, every layer of resistor disc is fixed on the insulative support frame by one group of connecting rod, support frame is made of insulating material, or adopts the metal material that wraps with insulating material.Whole framework is fixed in the sealing metal casing with porcelain insulator or synthetic insulator, and casing can be rainproof, dustproof.A pair of graphite nodule crack in parallel, resistor two ends and one group of lightning arrester (lightning arrester can not adorned as required yet) preventing overvoltage, and flow through the function that fault current plays protective resistor by it.To the lead collar tube loop, insert a cover current measuring device at resistor, energy measurement direct current and alternating current, and on the resistance casing, show with table meter, signal can be delivered on the control flow by transmission line, the branch closing operation of control earthed switch, the access and the disconnection of control resistor in real time reduces the loss that inserts increase because of resistor.
Resistor mainly inserts transformer neutral point between the ground, and if any little reactance, the back of connecting with reactor is inserted.It mainly acts on is direct current inflow transformer in the restriction the earth, prevents that the transformer influenced by DC magnetic biasing from producing abnormal vibrations and noise damages transformer; When can be used for the transformer single phase ground fault simultaneously, play the effect that suppresses fault current; And access and disconnection by the earthed switch control resistor, the loss when effectively saving resistor and dropping into.At present the neutral resistor device is generally conventional resistor, can't bear overvoltage and fault current passes through, the folding of also uncontrollable earthed switch.
Transformer neutral point installs small resistor additional can effectively limit the direct current that flows through the main transformer neutral point, and it is little and controlled to transformer body and systematic influence, its operational mode is simple, can be installed in series with the little reactance of neutral point, solves the problem of restriction direct current and single-phase short circuit current simultaneously.
And the resistor disc among the present invention can be used other material, guarantees that resistance is with high temperature resistant identical.Graphite nodule also can adopt the sphere gap of other protective value equivalence to replace.The measurement of earth current can adopt electromagnetic coupled or inducing method to measure.
In summary, the present invention by sealing in small resistor, can effectively suppress the influence of D.C. magnetic biasing at transformer neutral point, prevents that vibration strengthens transformer, noise increases, loss increases because of magnetic bias causes.
Certainly, those skilled in the art in the present technique field will be appreciated that, the foregoing description only is to be used for illustrating the present invention, and be not as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claim of the present invention the variation of the foregoing description, modification etc.
Claims (10)
1. a transformer neutral point D.C. magnetic biasing suppression resistor is characterized in that: comprise the resistance, current surveillance instrument and a pair of graphite nodule that are arranged in the casing;
Described resistor comprises some resistance, and resistance is also welded by nichrome or the coiling of nichrome aluminum alloy resistor disc and is in series, and perforate is serially connected on the connecting rod on the resistor disc, and connecting rod is fixed on the insulative support frame, a pair of graphite nodule in parallel crack, resistor two ends;
Described resistor is formed in parallel by some resistance string;
Described current surveillance instrument comprises the current surveillance meter.
2. transformer neutral point D.C. magnetic biasing suppression resistor as claimed in claim 1 is characterized in that: be provided with insulated porcelain sleeve or insulation mica between the described resistor disc.
3. transformer neutral point D.C. magnetic biasing suppression resistor as claimed in claim 1, it is characterized in that: described framework is an insulating material.
4. transformer neutral point D.C. magnetic biasing suppression resistor as claimed in claim 1 is characterized in that: described framework is the metal material that insulating material wraps.
5. transformer neutral point D.C. magnetic biasing suppression resistor as claimed in claim 1 is characterized in that: described resistor two ends one group of lightning arrester also in parallel.
6. transformer neutral point D.C. magnetic biasing suppression resistor as claimed in claim 5 is characterized in that: also comprise the insulation isolation ward, be arranged in the casing, graphite nodule, lightning arrester and miscellaneous part are isolated.
7. transformer neutral point D.C. magnetic biasing suppression resistor as claimed in claim 1, it is characterized in that: described insulative support frame is fixed in the casing by porcelain insulator or synthetic insulator.
8. transformer neutral point D.C. magnetic biasing suppression resistor as claimed in claim 1 is characterized in that: described current surveillance instrument also comprises current sensor or current transformer,
9. transformer neutral point D.C. magnetic biasing suppression resistor as claimed in claim 1, it is characterized in that: the display floater of described current surveillance meter is arranged on the cabinet panel.
10. transformer neutral point D.C. magnetic biasing suppression resistor as claimed in claim 1 is characterized in that: described casing is provided with the entrance bushing and the outlet sleeve pipe of insulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102763447A CN102005274B (en) | 2010-09-09 | 2010-09-09 | Neutral point direct current (DC) magnetic bias suppression resistor of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102763447A CN102005274B (en) | 2010-09-09 | 2010-09-09 | Neutral point direct current (DC) magnetic bias suppression resistor of transformer |
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| Publication Number | Publication Date |
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| CN102005274A true CN102005274A (en) | 2011-04-06 |
| CN102005274B CN102005274B (en) | 2012-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010102763447A Active CN102005274B (en) | 2010-09-09 | 2010-09-09 | Neutral point direct current (DC) magnetic bias suppression resistor of transformer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786436A (en) * | 2016-11-25 | 2017-05-31 | 国网四川省电力公司电力科学研究院 | A kind of converter power transformer neutral point installs the method that low reactance suppresses single-phase short circuit additional |
| CN107025994A (en) * | 2017-06-01 | 2017-08-08 | 班戈设备系统（苏州）有限公司 | A kind of transformer for carrying lightning protection device |
| CN110275088A (en) * | 2019-07-30 | 2019-09-24 | 河南四达检测技术有限公司 | A kind of distributing net platform region equipment ground operating state monitoring system |
| CN111508675A (en) * | 2020-04-26 | 2020-08-07 | 国网内蒙古东部电力有限公司检修分公司 | Resistor inside resistance type magnetic biasing treatment device and design method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2162016Y (en) * | 1993-06-25 | 1994-04-13 | 北京市朝阳区光源开关控制设备厂 | Earthing resistance cabinet |
| US5877674A (en) * | 1996-09-12 | 1999-03-02 | Post Glover Resistors Inc. | Resistor with elongated resistor element panels |
| CN1885658A (en) * | 2006-05-19 | 2006-12-27 | 南方电网技术研究中心 | Device for restraining AC transformer DC magnetic bias current |
| CN201465694U (en) * | 2009-05-28 | 2010-05-12 | 邓寿增 | Novel neutral grounding resistor |
-
2010
- 2010-09-09 CN CN2010102763447A patent/CN102005274B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2162016Y (en) * | 1993-06-25 | 1994-04-13 | 北京市朝阳区光源开关控制设备厂 | Earthing resistance cabinet |
| US5877674A (en) * | 1996-09-12 | 1999-03-02 | Post Glover Resistors Inc. | Resistor with elongated resistor element panels |
| CN1885658A (en) * | 2006-05-19 | 2006-12-27 | 南方电网技术研究中心 | Device for restraining AC transformer DC magnetic bias current |
| CN201465694U (en) * | 2009-05-28 | 2010-05-12 | 邓寿增 | Novel neutral grounding resistor |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786436A (en) * | 2016-11-25 | 2017-05-31 | 国网四川省电力公司电力科学研究院 | A kind of converter power transformer neutral point installs the method that low reactance suppresses single-phase short circuit additional |
| CN107025994A (en) * | 2017-06-01 | 2017-08-08 | 班戈设备系统（苏州）有限公司 | A kind of transformer for carrying lightning protection device |
| CN110275088A (en) * | 2019-07-30 | 2019-09-24 | 河南四达检测技术有限公司 | A kind of distributing net platform region equipment ground operating state monitoring system |
| CN110275088B (en) * | 2019-07-30 | 2021-04-23 | 河南四达检测技术有限公司 | Distribution network platform area equipment grounding operation state monitoring system |
| CN111508675A (en) * | 2020-04-26 | 2020-08-07 | 国网内蒙古东部电力有限公司检修分公司 | Resistor inside resistance type magnetic biasing treatment device and design method thereof |
| CN111508675B (en) * | 2020-04-26 | 2021-11-02 | 国网内蒙古东部电力有限公司检修分公司 | Resistor inside resistance type magnetic biasing treatment device and design method thereof |
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| Publication number | Publication date |
|---|---|
| CN102005274B (en) | 2012-11-07 |
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Owner name: EAST CHINA ELECTRIC POWER TEST + RESEARCH INSTITUT Free format text: FORMER OWNER: SHANGHAI MINGHUA ELECTRIC POWER TECHNOLOGY ENGINEERING CO., LTD. Effective date: 20130808 Owner name: SHANGHAI ELECTRIC POWER CORP. Free format text: FORMER OWNER: EAST CHINA ELECTRIC POWER TEST + RESEARCH INSTITUTE CO., LTD. Effective date: 20130808 |
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Free format text: CORRECT: ADDRESS; FROM: 200437 HONGKOU, SHANGHAI TO: 200122 PUDONG NEW AREA, SHANGHAI |
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| TR01 | Transfer of patent right |
Effective date of registration: 20130808 Address after: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Patentee after: Shanghai Electric Power Corporation Patentee after: East China Electric Power Test & Research Institute Co., Ltd. Patentee after: Shanghai Minghua Electric Power Technology Engineering Co., Ltd. Patentee after: Shanghai Electric Power Co., Ltd. Address before: 200437 Handan Road, Shanghai, No. 171, No. Patentee before: East China Electric Power Test & Research Institute Co., Ltd. Patentee before: Shanghai Minghua Electric Power Technology Engineering Co., Ltd. |