CN103592564A - Grounding judgment device of voltage transformer grounded neutral wire for protecting transformer substation - Google Patents
Grounding judgment device of voltage transformer grounded neutral wire for protecting transformer substation Download PDFInfo
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- CN103592564A CN103592564A CN201310607110.XA CN201310607110A CN103592564A CN 103592564 A CN103592564 A CN 103592564A CN 201310607110 A CN201310607110 A CN 201310607110A CN 103592564 A CN103592564 A CN 103592564A
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Abstract
The invention relates to a grounding judgment device of a voltage transformer grounded neutral wire for protecting a transformer substation. The grounding judgment device is characterized in that the grounded neutral wire is grounded through a first current branch circuit and a second current branch circuit respectively, the first current branch circuit is sleeved by a first straight-through current sensor (1), and the output end of the first straight-through current sensor (1) is connected with a first ammeter (A1), so that a current value of the first current branch circuit is detected in real time. The second current branch circuit is sleeved by the second straight-through current sensor (3), and the output end of the second straight-through current sensor (3) is connected with a second ammeter (A2), so that a current value of the second current branch circuit is detected in real time. In addition, a grounding resistor (R) and a grounding switch (K) are further connected to the second current branch circuit in series. After adopting the grounding judgment device, the grounding correctness of the voltage transformer grounded neutral wire (N600) for protection can be quickly judged.
Description
Technical field
The present invention relates to the ground connection judgment means of voltage transformer (VT) grounded neutral wire for a kind of transforming plant protecting.
Background technology
Transforming plant protecting (specially) is mainly to do voltage sample for protective device sampling circuit with voltage transformer (VT).The N600 line of protection dedicated potential transformer refers to grounded neutral wire, < < relay protection of power system and automatic safety device and accident measure will be put in > > and clearly be stipulated: 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 be at pulpit one point earth, each voltage transformer secondary neutral point should disconnect at switch yard earth point, for protective ground reliable, the neutral point of each voltage transformer (VT) must not be received on the isolating switch or contactor likely disconnecting.When if N600 line is connected on respectively switch yard and detection chamber or other local time; once system breaks down; 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, thereby may cause the zero sequence direction of relay protection to protect tripping and malfunction.
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; caused the possibility of grid relay protective apparatus mistake action and rejecting action; and then affect the safe operation of electrical network; not for N600 line Grounding suitable detection method and means, reason is mainly manifested at present: 1, the poor problem of measuring accuracy, does not have special-purpose portable opening jaw type current clamp energy Measurement accuracy.2, there is no a kind of on-the-spot measurement mechanism that meets completely, ideal tools, can accurately judge N600 line ground connection unicity.
Summary of the invention
The object of this invention is to provide the ground connection judgment means of voltage transformer (VT) grounded neutral wire for a kind of transforming plant protecting, can judge fast whether proper grounding of grounded neutral wire.
The ground connection judgment means of voltage transformer (VT) grounded neutral wire for a kind of transforming plant protecting, 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, in this first current branch, be set with the first centre path current sensor, the output terminal of this first centre path current sensor is connected with the first reometer, thereby detects in real time the current value of the first current branch; In this second current branch, be set with the second centre path current sensor, the output terminal of this second centre path current sensor is connected with the second reometer, thereby detect in real time the current value of the second current branch, 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 by crocodile clip respectively with the second current branch.
Wherein grounding switch adopts pushbutton switch, and stake resistance adopts adjustable resistance.
Through probationary certificate; adopt after ground connection judgment means of the present invention; the ground connection correctness of protective voltage transformer, grounded neutral wire (N600 line) be can judge rapidly, thereby protective voltage transformer, N600 line generation multipoint earthing or the phenomenon such as earth-free avoided.
Accompanying drawing explanation
Accompanying drawing 1 is structural representation of the present invention.
Embodiment
As shown in Figure 1, the present invention is the ground connection judgment means of voltage transformer (VT) grounded neutral wire for a kind of transforming plant protecting, comprise grounded neutral wire, described grounded neutral wire is respectively by the first current branch and the second current branch ground connection, in this first current branch, be 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, thereby detects in real time the current value of the first current branch; In this second current branch, be set with the second centre path current sensor 3, (passing through current-limiting resistance) ground connection after the output terminal of this second centre path current sensor 3 is connected with the second reometer A2, thereby detect in real time the current value of the second current branch, 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 by crocodile clip 2 respectively with the second current branch, and grounding switch K adopts pushbutton switch, and stake resistance R adopts adjustable resistance, thereby can adjust voluntarily as required.
Using method of the present invention and principle of work are:
The transforming plant protecting of normal operation uses voltage transformer (VT) N600 line under the effect of high voltage power transmission; N600 line has certain electric current to flow through; rule of thumb conventionally can be less than 150mA, first the first centre path current sensor 1 senses electric current, by the first reometer A1, shows.And stake resistance R and grounding switch K form another current return of N600 line, the second centre path current sensor 3 also can sense the electric current that flows through stake resistance R and grounding switch K, in the second reometer A2, just can show the current value in this loop.
Under normal circumstances, when grounding switch K opens, the reading of the second reometer A2 should be: " 0 ", the reading of the first reometer A1 is the normal electrical flow valuve of N600 line, for example 100mA.
In use, when grounding switch K is closed, the reading of the second reometer A2 should be the electric current difference of the first reometer A1, i.e. first reometer A1+ the 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 exist multipoint earthing phenomenon, also have other current branch to exist.
In use, if the reading of the first reometer A1 is 0, represent that N600 line loop exists imperfect earth.
Claims (3)
1. the ground connection judgment means of voltage transformer (VT) grounded neutral wire for a transforming plant protecting, 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, in this first current branch, be 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), thereby detects in real time the current value of the first current branch; In this second current branch, be 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), thereby detect in real time the current value of the second current branch, and in this second current branch, be also in series with stake resistance (R) and grounding switch (K).
2. the ground connection judgment means of voltage transformer (VT) grounded neutral wire for transforming plant protecting as claimed in claim 1, is characterized in that: wherein the first current branch is connected with grounded neutral wire by crocodile clip (2) respectively with the second current branch.
3. the ground connection judgment means of voltage transformer (VT) grounded neutral wire for transforming plant protecting as claimed in claim 1 or 2, it is characterized in that: wherein grounding switch (K) adopts pushbutton switch, and stake resistance (R) adopts adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN103592564A true CN103592564A (en) | 2014-02-19 |
| CN103592564B CN103592564B (en) | 2016-03-30 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103983895A (en) * | 2014-04-08 | 2014-08-13 | 广西电网公司电力科学研究院 | PT secondary circuit online N-line multipoint ground fault detection method and device |
| 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 |
| CN108957203A (en) * | 2018-05-22 | 2018-12-07 | 南京南瑞继保电气有限公司 | A method of detection PT broken neutral line |
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| 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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| US20070210808A1 (en) * | 2006-03-02 | 2007-09-13 | Ellison Yang | Real-time multi-point ground resistance monitoring device |
| 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 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983895A (en) * | 2014-04-08 | 2014-08-13 | 广西电网公司电力科学研究院 | PT secondary circuit online N-line multipoint ground fault detection method and device |
| 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 |
| CN108957203A (en) * | 2018-05-22 | 2018-12-07 | 南京南瑞继保电气有限公司 | A method of detection PT broken neutral line |
| 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 |
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| CN103592564B (en) | 2016-03-30 |
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