CN103048586B - The verification method of voltage transformer (VT) wiring correctness - Google Patents
The verification method of voltage transformer (VT) wiring correctness Download PDFInfo
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- CN103048586B CN103048586B CN201210541817.0A CN201210541817A CN103048586B CN 103048586 B CN103048586 B CN 103048586B CN 201210541817 A CN201210541817 A CN 201210541817A CN 103048586 B CN103048586 B CN 103048586B
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000012795 verification Methods 0.000 title claims abstract description 8
- 238000002474 experimental method Methods 0.000 claims abstract description 9
- 230000008030 elimination Effects 0.000 claims abstract description 5
- 238000003379 elimination reaction Methods 0.000 claims abstract description 5
- 238000004088 simulation Methods 0.000 claims abstract description 5
- 238000004804 winding Methods 0.000 claims abstract description 4
- 230000006837 decompression Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
One can prevent PT from burning, and the verification method of the voltage transformer (VT) wiring correctness that can give the alarm in time when there is singlephase earth fault, voltage source is led to as primary side with 380V three-phase test power supply, mode of connection when simulation normally runs, disconnect the connection of harmonic elimination PT and earth point, by corresponding to A, B, C, N of experiment power supply access voltage transformer (VT) primary winding; Voltage input-terminal in secondary side protection screen terminal block measures secondary side voltage, if each phase voltage of A, B, C is the no-load voltage ratio of 380V/ voltage transformer (VT), the voltage between N phase and L terminal is 0, shows that wiring is correct; Simulation singlephase earth fault; the A phase of experiment power supply, B phase and C phase are exchanged with N phase respectively; the upper each phase secondary side voltage of measuring and protecting screen end row again; faulted phase voltage is 0; magnitude of voltage between N phase and L terminal is the no-load voltage ratio of 380V/ voltage transformer (VT); whether this magnitude of voltage there is is the judgment value of earth fault as system, given the alarm by warning system.
Description
Technical field
The present invention relates to the verification method of voltage transformer (VT) wiring correctness in a kind of electric system.
Background technology
At electric system 220KV, 66KV, 10KV voltage transformer (VT) once because of polarity wrong or secondary connection mistake, voltage transformer (VT) may be caused to burn, make protective device decompression, cause relay fail; In addition, during circuit generation singlephase earth fault, can not notify that operations staff processes in time, because process may expand accident scope not in time, cause unnecessary loss.
Summary of the invention
The technical problem to be solved in the present invention is to provide one and can prevents PT from burning, and the verification method of the voltage transformer (VT) wiring correctness that can give the alarm in time when there is singlephase earth fault.
Technical solution of the present invention is:
A verification method for voltage transformer (VT) wiring correctness, its special character is:
1, lead to voltage source with 380V three-phase test power supply as primary side, first, mode of connection when simulation normally runs, disconnects the connection of harmonic elimination PT and earth point, by corresponding to A, B, C, N of experiment power supply access voltage transformer (VT) primary winding;
2, the voltage input-terminal in protection screen terminal block is measured secondary side voltage, if each phase voltage of A, B, C is the no-load voltage ratio of 380V/ voltage transformer (VT), the voltage between N phase and L terminal is 0, shows that wiring is correct; If the voltage between N phase and L terminal is not 0, then wiring is incorrect, shows that there are short circuit or voltage transformer secondary polarity wiring error in voltage transformer (VT) inside, phase voltage be 0 mutually for fault phase, phase voltage is
be healthy phases mutually;
3, singlephase earth fault is simulated, the A phase of experiment power supply, B phase and C phase are exchanged with N phase respectively, the upper each phase secondary side voltage of measuring and protecting screen end row again, the magnitude of voltage recorded between N phase and L terminal is the no-load voltage ratio of 380V/ voltage transformer (VT), whether this magnitude of voltage there is is the judgment value of earth fault as system, given the alarm by warning system; Phase voltage be 0 mutually for fault phase, phase voltage is
be healthy phases mutually.
The present invention can prevent PT from burning and protective device decompression, improves protection performance factor, and can give the alarm in time when there is singlephase earth fault, notify that operations staff processes in time in time, prevent expansion accident scope, reduce the loss.
Accompanying drawing explanation
Fig. 1 is the wiring diagram of experiment power supply and voltage transformer (VT);
Fig. 2 is the wiring diagram of voltage transformer secondary side and protection screen terminal block.
Embodiment
As shown in the figure, the test method of on-site verification harmonic elimination PT wiring correctness, concrete steps are as follows:
1, voltage source is led to 380V three-phase test power supply as primary side, first, mode of connection when simulation normally runs, disconnects the connection of harmonic elimination PT and earth point, by corresponding to A, B, C, N of experiment power supply access voltage transformer (VT) primary winding, the no-load voltage ratio of described voltage transformer (VT) is
this example
2, the voltage input-terminal in protection screen terminal block uses voltage table
measure secondary side voltage, if the voltage that each phase voltage of A, B, C is the no-load voltage ratio=between 3.8V, N phase and L terminal of 380V/ voltage transformer (VT) is 0, show that wiring is correct; If the voltage between N phase and L terminal is not 0, then wiring is incorrect, shows that there are short circuit or voltage transformer secondary polarity wiring error in voltage transformer (VT) inside; Phase voltage be 0 mutually for fault phase, phase voltage is
be healthy phases mutually;
3, singlephase earth fault is simulated, the A phase of experiment power supply, B phase and C phase are exchanged with N phase respectively, upper each phase (secondary side) voltage of measuring and protecting screen end row again, the magnitude of voltage recorded between N phase and L terminal is the no-load voltage ratio=3.8V of 380V/ voltage transformer (VT), whether this magnitude of voltage is had the judgment value of earth fault as system; When magnitude of voltage when between the actual N phase that records and L terminal is 3.8V, given the alarm by warning system; Phase voltage be 0 mutually for fault phase, phase voltage is
be healthy phases mutually.
Claims (1)
1. a verification method for voltage transformer (VT) wiring correctness, is characterized in that:
(1), with 380V three-phase test power supply lead to voltage source as primary side, first, mode of connection when simulation normally runs, disconnects the connection of harmonic elimination PT and earth point, by corresponding to A, B, C, N of experiment power supply access voltage transformer (VT) primary winding;
(2) voltage input-terminal, in protection screen terminal block is measured secondary side voltage, if each phase voltage of A, B, C is the no-load voltage ratio of 380V/ voltage transformer (VT), the voltage between N phase and L terminal is 0, shows that wiring is correct; If the voltage between N phase and L terminal is not 0, then wiring is incorrect, shows that there are short circuit or voltage transformer secondary polarity wiring error in voltage transformer (VT) inside; Phase voltage be 0 mutually for fault phase,
(3), singlephase earth fault is simulated, the A phase of experiment power supply, B phase and C phase are exchanged with N phase respectively, the upper each phase secondary side voltage of measuring and protecting screen end row again, the magnitude of voltage recorded between N phase and L terminal is the no-load voltage ratio of 380V/ voltage transformer (VT), whether this magnitude of voltage is had the judgment value of earth fault as system; When magnitude of voltage when between the actual N phase that records and L terminal is the no-load voltage ratio of 380V/ voltage transformer (VT), given the alarm by warning system; Phase voltage be 0 mutually for fault phase,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210541817.0A CN103048586B (en) | 2012-12-14 | 2012-12-14 | The verification method of voltage transformer (VT) wiring correctness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210541817.0A CN103048586B (en) | 2012-12-14 | 2012-12-14 | The verification method of voltage transformer (VT) wiring correctness |
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| Publication Number | Publication Date |
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| CN103048586A CN103048586A (en) | 2013-04-17 |
| CN103048586B true CN103048586B (en) | 2016-01-20 |
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| CN201210541817.0A Active CN103048586B (en) | 2012-12-14 | 2012-12-14 | The verification method of voltage transformer (VT) wiring correctness |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104597372A (en) * | 2014-12-31 | 2015-05-06 | 中国二冶集团有限公司 | Method for verifying relay protection secondary system |
| CN104833836A (en) * | 2015-04-23 | 2015-08-12 | 本钢板材股份有限公司 | Zero sequence voltage detection method for voltage transformer |
| CN110531214B (en) * | 2019-08-28 | 2022-06-07 | 中广核工程有限公司 | Detection and verification method for detecting short circuit of secondary circuit winding of voltage transformer |
| CN110824388A (en) * | 2019-10-22 | 2020-02-21 | 国网浙江省电力有限公司绍兴供电公司 | 4PT wiring polarity discrimination method for small current grounding system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2261957B (en) * | 1991-11-16 | 1995-05-17 | Voltech Instr Ltd | Apparatus for testing wound components |
| CN101694505B (en) * | 2009-09-24 | 2011-07-13 | 江苏省电力公司南通供电公司 | Method for simulating load test with transformer substation bus differential protection current |
| CN101806848A (en) * | 2010-04-19 | 2010-08-18 | 河南省电力公司南阳供电公司 | Detection device for preventing mis-wiring of voltage transformer and detection method thereof |
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