CN103592564B - The transforming plant protecting ground connection judgment means of voltage transformer (VT) grounded neutral wire - Google Patents
The transforming plant protecting ground connection judgment means of voltage transformer (VT) grounded neutral wire Download PDFInfo
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- CN103592564B CN103592564B CN201310607110.XA CN201310607110A CN103592564B CN 103592564 B CN103592564 B CN 103592564B CN 201310607110 A CN201310607110 A CN 201310607110A CN 103592564 B CN103592564 B CN 103592564B
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- 230000007935 neutral effect Effects 0.000 title claims abstract description 28
- 230000001131 transforming effect Effects 0.000 title claims abstract description 13
- 241000270722 Crocodylidae Species 0.000 claims description 3
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- 230000001681 protective effect Effects 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Abstract
The present invention relates to a kind of ground connection judgment means of transforming plant protecting voltage transformer (VT) grounded neutral wire.Be characterized in: described grounded neutral wire is respectively by the first current branch and the second current branch ground connection, this first current branch is set with the first centre path current sensor (1), the output terminal of this first centre path current sensor (1) is connected with the first reometer (A1), thus detects the current value of the first current branch in real time; This second current branch is set with the second centre path current sensor (3), the output terminal of this second centre path current sensor (3) is connected with the second reometer (A2), thus detect the current value of the second current branch in real time, and in this second current branch, be also in series with stake resistance (R) and grounding switch (K).After adopting ground connection judgment means of the present invention, the ground connection correctness of protective voltage transformer, grounded neutral wire (N600 line) can be judged rapidly.
Description
Technical field
The present invention relates to a kind of ground connection judgment means of transforming plant protecting voltage transformer (VT) grounded neutral wire.
Background technology
Transforming plant protecting (specially) with voltage transformer (VT) mainly for protective device sampling circuit does voltage sample.The N600 line of protection dedicated potential transformer refers to grounded neutral wire; clear stipulaties in " relay protection of power system and automatic safety device and accident measure main points ": several groups of Secondary Circuit of Potential Transformers that the zero mutually little bus neutral point (N600 line) through pulpit is communicated with; only should at pulpit one point earth; each voltage transformer secondary neutral point should disconnect at switch yard earth point; in order to protective ground is reliable, the neutral point of each voltage transformer (VT) must not be received on the isolating switch or contactor that likely disconnect.If when N600 line is connected on switch yard and detection room respectively or other local time; once system jam; substation ground network will flow through major break down electric current; at this moment N600 line two ends just there will be different voltage differences; cause neutral point voltage phase deviation; enter and affect phase voltage and no-voltage amplitude and phase-splitting current potential, thus zero-sequence voltage injection tripping and the malfunction of relay protection may be caused.
At present along with transforming plant primary equipment transformation; Secondary Circuit of Potential Transformer N600 line earth point increases gradually; usually there is N600 line multipoint earthing phenomenon; cause the possibility of grid relay protective apparatus mistake action and rejecting action; and then affect the safe operation of electrical network; do not have at present for the suitable detection method of N600 line Grounding and means, reason is mainly manifested in: 1, measuring accuracy difference problem, does not have special portable opening jaw type current clamp energy Measurement accuracy.2, do not have a kind of measurement mechanism meeting scene completely, ideal tools, accurately can judge N600 line ground connection unicity.
Summary of the invention
The object of this invention is to provide a kind of ground connection judgment means of transforming plant protecting voltage transformer (VT) grounded neutral wire, grounded neutral wire whether proper grounding can be judged fast.
A kind of ground connection judgment means of transforming plant protecting voltage transformer (VT) grounded neutral wire, comprise grounded neutral wire, its special feature is: described grounded neutral wire is respectively by the first current branch and the second current branch ground connection, this first current branch is set with the first centre path current sensor, the output terminal of this first centre path current sensor is connected with the first reometer, thus detects the current value of the first current branch in real time; This second current branch is set with the second centre path current sensor, the output terminal of this second centre path current sensor is connected with the second reometer, thus detect the current value of the second current branch in real time, and be also in series with stake resistance and grounding switch in this second current branch.
Wherein the first current branch is connected with grounded neutral wire respectively by crocodile clip with the second current branch.
Wherein grounding switch adopts pushbutton switch, and stake resistance adopts adjustable resistance.
Through probationary certificate; after adopting ground connection judgment means of the present invention; the ground connection correctness of protective voltage transformer, grounded neutral wire (N600 line) can be judged rapidly, thus avoid protective voltage transformer, N600 line generation multipoint earthing or the phenomenon such as earth-free.
Accompanying drawing explanation
Accompanying drawing 1 is structural representation of the present invention.
Embodiment
As shown in Figure 1, the present invention is a kind of ground connection judgment means of transforming plant protecting voltage transformer (VT) grounded neutral wire, comprise grounded neutral wire, described grounded neutral wire is respectively by the first current branch and the second current branch ground connection, this first current branch is set with the first centre path current sensor 1, the output terminal of this first centre path current sensor 1 is connected rear (passing through current-limiting resistance) ground connection with the first reometer A1, thus detects the current value of the first current branch in real time; This second current branch is set with the second centre path current sensor 3, the output terminal of this second centre path current sensor 3 is connected rear (passing through current-limiting resistance) ground connection with the second reometer A2, thus detect the current value of the second current branch in real time, and be also in series with stake resistance R and grounding switch K in this second current branch.
Wherein the first current branch is connected with grounded neutral wire respectively by crocodile clip 2 with the second current branch, and grounding switch K adopts pushbutton switch, and stake resistance R adopts adjustable resistance, thus can as required from Row sum-equal matrix.
Using method of the present invention and principle of work are:
The transforming plant protecting voltage transformer (VT) N600 line of normal operation is under the effect of high voltage power transmission; N600 line has certain electric current to flow through; rule of thumb usually can be less than 150mA, first the first centre path current sensor 1 senses electric current, is shown by the first reometer A1.And stake resistance R and grounding switch K forms another current return of N600 line, the second centre path current sensor 3 also can sense the electric current flowing through stake resistance R and grounding switch K, just can show the current value in this loop in the second reometer A2.
Under normal circumstances, when grounding switch K opens, the reading of the second reometer A2 should be: " 0 ", and the reading of the first reometer A1 is the normal electrical flow valuve of N600 line, such as 100mA.
In using, when grounding switch K closes, the reading of the second reometer A2 should be the current differential of the first reometer A1, i.e. the first reometer A1+ second reometer A2=100mA, if instead the reading of the second reometer A2 is not the difference of the first reometer A1, now represent to there is multipoint earthing phenomenon, namely also have other current branch to exist.
In using, if the reading of the first reometer A1 is 0, then represent that N600 line loop exists imperfect earth.
Claims (3)
1. the transforming plant protecting ground connection judgment means of voltage transformer (VT) grounded neutral wire, comprise grounded neutral wire, it is characterized in that: described grounded neutral wire is respectively by the first current branch and the second current branch ground connection, this first current branch is set with the first centre path current sensor (1), the output terminal of this first centre path current sensor (1) is connected with the first reometer (A1), and by current-limiting resistance ground connection after the output terminal of this first centre path current sensor (1) is connected with the first reometer (A1), thus detect the current value of the first current branch in real time, this second current branch is set with the second centre path current sensor (3), the output terminal of this second centre path current sensor (3) is connected with the second reometer (A2), thus detect the current value of the second current branch in real time, and in this second current branch, be also in series with stake resistance (R) and grounding switch (K).
2. the transforming plant protecting ground connection judgment means of voltage transformer (VT) grounded neutral wire as claimed in claim 1, is characterized in that: wherein the first current branch is connected with grounded neutral wire respectively by crocodile clip (2) with the second current branch.
3. the transforming plant protecting ground connection judgment means of voltage transformer (VT) grounded neutral wire as claimed in claim 1 or 2, is characterized in that: wherein grounding switch (K) adopts pushbutton switch, and stake resistance (R) adopts adjustable resistance.
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| CN201310607110.XA CN103592564B (en) | 2013-11-26 | 2013-11-26 | The transforming plant protecting ground connection judgment means of voltage transformer (VT) grounded neutral wire |
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| CN201310607110.XA CN103592564B (en) | 2013-11-26 | 2013-11-26 | The transforming plant protecting ground connection judgment means of voltage transformer (VT) grounded neutral wire |
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| CN103592564B true CN103592564B (en) | 2016-03-30 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983895B (en) * | 2014-04-08 | 2016-08-17 | 广西电网公司电力科学研究院 | The online N line multipoint earth faults detection method of PT secondary circuit |
| CN104237739A (en) * | 2014-09-11 | 2014-12-24 | 深圳供电局有限公司 | Multipoint earth fault detection method, device and system for secondary current circuit |
| CN107015106A (en) * | 2017-06-02 | 2017-08-04 | 广州思壮电气股份有限公司 | Ground state detection unit, earthing or grounding means and ground state detection method |
| CN107515353A (en) * | 2017-09-08 | 2017-12-26 | 深圳供电局有限公司 | A kind of bis- neutral conductor operation intelligent monitors of PT/CT |
| CN107979082A (en) * | 2017-12-11 | 2018-05-01 | 国家电网公司 | The power network neutral point earthed system of controllable small resistor |
| CN108957203B (en) * | 2018-05-22 | 2021-02-09 | 南京南瑞继保电气有限公司 | Method for detecting PT neutral line disconnection |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2196812A1 (en) * | 2008-12-09 | 2010-06-16 | WaveTech Sweden AB | Monitoring device for detecting earth faults |
| EP2237057A1 (en) * | 2009-04-03 | 2010-10-06 | Siemens Aktiengesellschaft | Analysis device for analysing an electricity network |
| CN202210132U (en) * | 2011-08-22 | 2012-05-02 | 江苏省电力公司昆山市供电公司 | One point grounding detection device for secondary loop of mutual inductor of transformer substation |
| CN202886524U (en) * | 2012-09-13 | 2013-04-17 | 温州市科星电子有限公司 | Transformer station voltage transformer secondary circuit grounding monitoring device |
| CN103197195A (en) * | 2013-03-29 | 2013-07-10 | 国家电网公司 | Detecting method and detecting system for multipoint earthing of voltage second loop neutral conductor network |
| CN203572910U (en) * | 2013-11-26 | 2014-04-30 | 国家电网公司 | Grounding judgment device for grounded neutral wire of substation protection voltage transformer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200735721A (en) * | 2006-03-02 | 2007-09-16 | Yang Hsueh Chang | Real-time multi-point grounding resistance monitoring device |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2196812A1 (en) * | 2008-12-09 | 2010-06-16 | WaveTech Sweden AB | Monitoring device for detecting earth faults |
| EP2237057A1 (en) * | 2009-04-03 | 2010-10-06 | Siemens Aktiengesellschaft | Analysis device for analysing an electricity network |
| CN202210132U (en) * | 2011-08-22 | 2012-05-02 | 江苏省电力公司昆山市供电公司 | One point grounding detection device for secondary loop of mutual inductor of transformer substation |
| CN202886524U (en) * | 2012-09-13 | 2013-04-17 | 温州市科星电子有限公司 | Transformer station voltage transformer secondary circuit grounding monitoring device |
| CN103197195A (en) * | 2013-03-29 | 2013-07-10 | 国家电网公司 | Detecting method and detecting system for multipoint earthing of voltage second loop neutral conductor network |
| CN203572910U (en) * | 2013-11-26 | 2014-04-30 | 国家电网公司 | Grounding judgment device for grounded neutral wire of substation protection voltage transformer |
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