CN202916384U - Improved voltage transformer zero sequence circuit system capable of improving precision of line selection and fault positioning - Google Patents
Improved voltage transformer zero sequence circuit system capable of improving precision of line selection and fault positioning Download PDFInfo
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- CN202916384U CN202916384U CN 201220460643 CN201220460643U CN202916384U CN 202916384 U CN202916384 U CN 202916384U CN 201220460643 CN201220460643 CN 201220460643 CN 201220460643 U CN201220460643 U CN 201220460643U CN 202916384 U CN202916384 U CN 202916384U
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Abstract
The utility model develops an apparatus capable of improving precision of line selection and fault positioning of low-current grounding. More particularly, an improved voltage transformer zero sequence circuit system capable of improving precision of line selection and fault positioning is provided. The improved system includes a common ground wire zero sequence circuit connected with a three-phase voltage transformer; and a zero-sequence current transformer that is used for detecting the zero-sequence current of the branch and providing the detection result for an external grounding line selection and fault positioning apparatus is installed on the common ground wire zero sequence circuit According to the existing non-effective grounding system, the common ground wire zero sequence circuit of the bus three-phase voltage transformer is improved; and a zero sequence current transformer and a load switch are arranged. Therefore, accuracy and precision for line selection and fault positioning of single-phase grounding based on various theories can be effectively improved. Moreover, the provided apparatus with advantages of simple structure, simple operation and low cost and the like is suitable for large-scale application and popularization.
Description
Technical field
The utility model relates in the Patent classificating number: H02 generating, power transformation or distribution, relate in particular to a kind of can generally the raising for the single-phase grounding selecting and localization of fault accuracy and the precision that solve the various theories of non-effectively earthed system, can effectively process again the system of non-effectively earthed system ferroresonance phenomenon.
Background technology
At present, single-phase earth fault line selection relies on zero-sequence current relatively to carry out basically, in when, on the circuit single-phase nonmetal ground connection occuring when, owing to being subjected to the impact of stake resistance, and the unbalanced impact of three-phase ground capacitance, can select the faulty line scope very little, its theoretical derivation has many to the greatest extent falsities.For isolated neutral and small current neutral grounding system, the rules regulation, when singlephase earth fault occurs, allow to operate with failure two hours, because healthy phases voltage is increased to line voltage, long-play might cause insulation breakdown, and therefore single-phase earth fault line selection and localization of fault are our problems for a long time always fast, are not well solved.The various principles of its utilization of existing microcomputer ground fault line selection device are very ineffective in practice.Therefore, even to this day, some power supply departments are still adopting " backguy method " to carry out failure line selection, and power distribution automation is being required day by day perfect today.This has a strong impact on power supply reliability.For the existing problem of prior art, it is very necessary developing a kind of new method that can generally improve small current earthing wire-selecting and localization of fault precision.
The utility model content
The utility model is for the proposition of above problem, and a kind of voltage transformer (VT) zero sequence Circuit Retrofit system that improves route selection and localization of fault precision of development, have: the public ground wire zero sequence loop that is connected with threephase potential transformer, it is characterized in that: be equipped with in described public ground wire zero sequence loop: detect this branch road zero-sequence current, testing result is offered the zero sequence current mutual inductor of external ground route selection and fault locator.
On described public ground wire zero sequence loop, also be serially connected with: disconnect described public ground wire zero sequence loop, process the Ferroresonance Overvoltage Caused by PT phenomenon; Disconnect described public ground wire zero sequence loop, carry out after the zero-sequence current vanishing in this zero sequence loop fault line selection and fault locating and fault handling complete after, be in closure state, the on-load switch of the normal operation of recovery system.
Owing to having adopted technique scheme, a kind of system that improves small current earthing wire-selecting and localization of fault precision provided by the utility model, for existing non-effectively earthed system, by transforming the public ground wire zero sequence of bus threephase potential transformer loop, namely add zero sequence current mutual inductor and on-load switch, can effectively improve the single-phase grounding selecting of various theories and accuracy and the precision of localization of fault.The advantages such as this device has simple in structure, and is easy and simple to handle, with low cost, very suitable large-scale application and popularization.
Description of drawings
Technical scheme for clearer explanation embodiments of the invention or prior art, the below will do one to the accompanying drawing of required use in embodiment or the description of the Prior Art and introduce simply, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is electrical block diagram of the present utility model
Embodiment
For the purpose, technical scheme and the advantage that make embodiments of the invention is clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is known complete description:
As shown in Figure 1: a kind of voltage transformer (VT) zero sequence Circuit Retrofit system that improves route selection and localization of fault precision, have: the public ground wire zero sequence loop that is connected with threephase potential transformer, be equipped with in described public ground wire zero sequence loop: detect this branch road zero-sequence current, testing result is offered the zero sequence current mutual inductor of external ground route selection and fault locator.
Preferably, the detection of described zero-sequence current can also be passed through in each phase loop of threephase potential transformer current transformer to be installed, and realizes by the synthetic zero-sequence current that detects of three-phase.
Further, on described public ground wire zero sequence loop, also be serially connected with: disconnect described public ground wire zero sequence loop, process the Ferroresonance Overvoltage Caused by PT phenomenon; Disconnect described public ground wire zero sequence loop, make the on-load switch that carries out fault line selection and fault locating after this branch road zero-sequence current vanishing.After fault handling was complete, the on-load switch recovery system that closes normally moved.Thereby effectively provide the precision of high earthing wire-selecting and the accuracy of fault distinguishing.
In the actual use procedure, system disclosed in the utility model is also applicable to other voltage transformer (VT), and all can use equipment described in the utility model as long as satisfy the voltage transformer (VT) of following condition: the threephase potential transformer of namely installing must have primary winding and secondary coil at least.Public ground wire at described voltage transformer (VT) primary winding is connected with zero sequence current mutual inductor.Whether in some situation, utilizing bus-bar potential transformer zero-sequence current direction to differentiate has resonance to occur.
The above; only be the better embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, all should be encompassed within protection scope of the present invention.
Claims (2)
1. voltage transformer (VT) zero sequence Circuit Retrofit system that improves route selection and localization of fault precision, have: the public ground wire zero sequence loop that is connected with threephase potential transformer, it is characterized in that: be equipped with in described public ground wire zero sequence loop: detect this branch road zero-sequence current, testing result is offered the zero sequence current mutual inductor of external ground route selection and fault locator.
2. the voltage transformer (VT) zero sequence Circuit Retrofit system of raising route selection according to claim 1 and localization of fault precision, be further characterized in that on described public ground wire zero sequence loop and also be serially connected with: disconnect described public ground wire zero sequence loop, process the Ferroresonance Overvoltage Caused by PT phenomenon; Disconnect described public ground wire zero sequence loop, carry out after the zero-sequence current vanishing in this zero sequence loop fault line selection and fault locating and fault handling complete after, be in closure state, the on-load switch of the normal operation of recovery system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220460643 CN202916384U (en) | 2012-09-11 | 2012-09-11 | Improved voltage transformer zero sequence circuit system capable of improving precision of line selection and fault positioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220460643 CN202916384U (en) | 2012-09-11 | 2012-09-11 | Improved voltage transformer zero sequence circuit system capable of improving precision of line selection and fault positioning |
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| Publication Number | Publication Date |
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| CN202916384U true CN202916384U (en) | 2013-05-01 |
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| CN 201220460643 Expired - Fee Related CN202916384U (en) | 2012-09-11 | 2012-09-11 | Improved voltage transformer zero sequence circuit system capable of improving precision of line selection and fault positioning |
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| CN (1) | CN202916384U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104007307A (en) * | 2014-05-06 | 2014-08-27 | 西安理工大学 | Small-current single-phase ground fault current detecting circuit and method based on stochastic resonance |
| CN105606954A (en) * | 2015-11-16 | 2016-05-25 | 李玉领 | Single-phase grounding leakage line selection method and device of industrial and mineral low-tension electrical network |
| CN106099857A (en) * | 2016-08-17 | 2016-11-09 | 云南电网有限责任公司电力科学研究院 | Detection zero-sequence current pulse width conforming ferromagnetic resonance harmonic elimination method |
| CN106207970A (en) * | 2016-08-17 | 2016-12-07 | 云南电网有限责任公司电力科学研究院 | The ferromagnetic resonance harmonic elimination method of detection zero-sequence current pulse number |
| CN106229960A (en) * | 2016-08-17 | 2016-12-14 | 云南电网有限责任公司电力科学研究院 | Detection zero-sequence current pulse amplitude conforming ferromagnetic resonance harmonic elimination method |
| CN106229946A (en) * | 2016-08-17 | 2016-12-14 | 云南电网有限责任公司电力科学研究院 | A kind of ferromagnetic resonance harmonic elimination apparatus and method |
| CN106253226A (en) * | 2016-08-17 | 2016-12-21 | 云南电网有限责任公司电力科学研究院 | The ferromagnetic resonance harmonic elimination method of detection zero-sequence current pulse width |
| CN110658377A (en) * | 2019-10-23 | 2020-01-07 | 国网山西省电力公司阳泉供电公司 | Voltage secondary opening triangular loop monitoring device |
-
2012
- 2012-09-11 CN CN 201220460643 patent/CN202916384U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104007307A (en) * | 2014-05-06 | 2014-08-27 | 西安理工大学 | Small-current single-phase ground fault current detecting circuit and method based on stochastic resonance |
| CN104007307B (en) * | 2014-05-06 | 2017-01-11 | 西安理工大学 | Small-current single-phase ground fault current detecting circuit and method based on stochastic resonance |
| CN105606954A (en) * | 2015-11-16 | 2016-05-25 | 李玉领 | Single-phase grounding leakage line selection method and device of industrial and mineral low-tension electrical network |
| CN105606954B (en) * | 2015-11-16 | 2018-05-01 | 山东华美电力自动化有限公司 | A kind of industrial and mineral low voltage electric network single-phase earthing electric leakage selection method and device |
| CN106099857A (en) * | 2016-08-17 | 2016-11-09 | 云南电网有限责任公司电力科学研究院 | Detection zero-sequence current pulse width conforming ferromagnetic resonance harmonic elimination method |
| CN106207970A (en) * | 2016-08-17 | 2016-12-07 | 云南电网有限责任公司电力科学研究院 | The ferromagnetic resonance harmonic elimination method of detection zero-sequence current pulse number |
| CN106229960A (en) * | 2016-08-17 | 2016-12-14 | 云南电网有限责任公司电力科学研究院 | Detection zero-sequence current pulse amplitude conforming ferromagnetic resonance harmonic elimination method |
| CN106229946A (en) * | 2016-08-17 | 2016-12-14 | 云南电网有限责任公司电力科学研究院 | A kind of ferromagnetic resonance harmonic elimination apparatus and method |
| CN106253226A (en) * | 2016-08-17 | 2016-12-21 | 云南电网有限责任公司电力科学研究院 | The ferromagnetic resonance harmonic elimination method of detection zero-sequence current pulse width |
| CN106099857B (en) * | 2016-08-17 | 2018-05-25 | 云南电网有限责任公司电力科学研究院 | Detect the ferromagnetic resonance harmonic elimination method of zero-sequence current pulse width uniformity |
| CN110658377A (en) * | 2019-10-23 | 2020-01-07 | 国网山西省电力公司阳泉供电公司 | Voltage secondary opening triangular loop monitoring device |
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Legal Events
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| C14 | Grant of patent or utility model | ||
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| ASS | Succession or assignment of patent right |
Owner name: DALIAN ELECTRIC POWER SURVEY + DESIGN INSTITUTE CO Free format text: FORMER OWNER: CHEN CHANGPENG Effective date: 20131122 |
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| C41 | Transfer of patent application or patent right or utility model | ||
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Free format text: CORRECT: ADDRESS; FROM: 116000 DALIAN, LIAONING PROVINCE TO: 116011 DALIAN, LIAONING PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20131122 Address after: 116011 No. 69 Tongren street, Xigang District, Liaoning, Dalian Patentee after: DALIAN ELECTRIC POWER SURVEY & DESIGN INSTITUTE Co.,Ltd. Address before: Shahekou District of Dalian City, Liaoning province Longgang 116000 Park building 11, 2 floor, No. 1 and 1 Patentee before: Chen Changpeng |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130501 Termination date: 20210911 |
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| CF01 | Termination of patent right due to non-payment of annual fee |