CN100373728C - Controllable damp device of ferromagnetic resonance for electromagnetic voltage transformer for distribution network - Google Patents
Controllable damp device of ferromagnetic resonance for electromagnetic voltage transformer for distribution network Download PDFInfo
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- CN100373728C CN100373728C CNB2005101235594A CN200510123559A CN100373728C CN 100373728 C CN100373728 C CN 100373728C CN B2005101235594 A CNB2005101235594 A CN B2005101235594A CN 200510123559 A CN200510123559 A CN 200510123559A CN 100373728 C CN100373728 C CN 100373728C
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Abstract
The present invention provides a controllable damping device of the ferromagnetic resonance for an electromagnetic voltage transformer for an electric distribution network, which belongs to the technical field of control protection. The device comprises a damping reactor (4), inverse parallel controllable silicon (5) and a triggering controller (6), wherein the damping reactor (4) and the inverse parallel controllable silicon (5) are connected in series to form a damping control main circuit (3) which is connected to a port of a triangular winding (2) at a PT secondary side opening. The present invention has the advantages of effectively distinguishing the faults of resonance and single-phase earthing, correctly implementing resonant damping control, and accurately promoting the faults of frequency division, basic frequency and high frequency ferromagnetic resonance and single-phase earthing of the system. The device does not influence the normal operation of an electric network and the collection of zero sequence signals of the system, and generates higher harmonics and other interference signals.
Description
Technical field
The invention belongs to power distribution network control resist technology field, a kind of controllable damp device of ferromagnetic resonance for electromagnetic voltage transformer for distribution network particularly is provided.
Background technology
In the distribution network of 6～35kV, system neutral generally adopts earth-free mode.Be connected to the electromagnetic potential transformer (PT) of measuring and monitoring insulation against ground on the system busbar, when the bus-tie circuit breaker closing operation takes place, the single-phase arc grounding of circuit disappears automatically or during situation such as system loading acute variation, the transient state impact process that is produced may excite the ferro resonance phenomenon between PT and three-phase conducting wire direct-to-ground capacitance, cause the overcurrent among system's overvoltage and the PT, make that the high-voltage wire iron-melting fusing of flashover, PT over the ground takes place weak insulator arrangement in the system, even burn PT.The ferro resonance of PT is that appearance is the most frequent in the power distribution network, maximum a kind of Past Voltage within Power System causes the accident.
Summary of the invention
The object of the present invention is to provide a kind of controllable damp device of ferromagnetic resonance for electromagnetic voltage transformer for distribution network, can effectively distinguish resonance and single phase ground fault, the correct damping control of implementing resonance, and accurately frequency division, fundamental frequency, high-frequency iron magnetic resonance or single phase ground fault have taken place in indication mechanism.Device does not influence the normal operation of electrical network and the collection of system zero sequential signal; Do not produce high order harmonic component and other interference signal.
The present invention includes: damping reactor 4, inverse parallel controllable silicon 5, triggering controller 6.It is open-minded that triggering controller 6 sends the gate pole trigger impulse control silicon controlled of controllable silicon 5. Damping reactor 4 and 5 series connection of inverse parallel controllable silicon constitute damping control main circuit 3, are connected to PT secondary side open delta winding 2 ports.
Under the normal condition, SCR control pulse controlled device 6 is blocked, and controllable silicon is in blocking state, and open delta winding 2 ports of PT secondary side are open-circuit condition.
In case resonance or system single-phase earth fault take place, residual voltage can appear in open delta winding 2 ports, this voltage will trigger the frequency that controller 6 starts fast fourier algorithm (FFT) detectable voltage signals, remove silicon controlled pulse blocking then, trigger controllable silicon.Controllable silicon enters fully conducting state, and the equivalence of PT open delta winding 2 ports inserts damping reactor 4.
For resonance, damping reactor 4 absorbs resonant energy, reaches the harmonic elimination purpose, behind two power frequency cycles, controller 6 blocks the gate pole trigger impulse of controllable silicon 5, and controllable silicon 5 enters blocking state constantly at the current over-zero of PT open delta winding 2, and port voltage is near zero volt; If single phase ground fault though the input of damping reactor can not eliminated single phase ground fault, has limited PT open delta winding 2 electric currents, protected PT.Behind 2 power frequency cycles, controllable silicon recovers blocking-up, and PT open delta winding 2 ports are got back to open-circuit condition, but the bigger residual voltage that port voltage still produces for ground connection.The fault that thus can decision-making system takes place is resonance or single-phase earthing.
As seen, device does not influence the normal operation of electrical network and the collection of system zero sequential signal; Do not produce high order harmonic component and other interference signal.
The invention has the advantages that: the controllable damp device of a kind of ferromagnetic resonance for electromagnetic voltage transformer for distribution network that is provided, can effectively distinguish resonance and single phase ground fault, the correct damping control of implementing resonance, and accurately frequency division, fundamental frequency, high-frequency iron magnetic resonance or single phase ground fault have taken place in indication mechanism.Device does not influence the normal operation of electrical network and the collection of system zero sequential signal; Do not produce high order harmonic component and other interference signal.
Description of drawings
Fig. 1 is the controllable damp device system diagram of a kind of ferromagnetic resonance for electromagnetic voltage transformer for distribution network of the present invention.Wherein, winding 1 of PT, PT open delta winding 2, damping control main circuit 3.E
1, E
2, E
3Be respectively system's three-phase voltage, C
0Be line mutual-ground capacitor.
Fig. 2 is the controllable damp device figure of a kind of ferromagnetic resonance for electromagnetic voltage transformer for distribution network of the present invention.Wherein, PT open delta winding 2, damping control main circuit 3, damping reactor 4, inverse parallel controllable silicon 5, controller 6.Controller 6 sends or block the gate pole trigger impulse of controllable silicon 5 can realize opening of inverse parallel controllable silicon 5 and natural turn-off function.
Fig. 3 excites the Subharmonic Resonance experimental waveform for the simulation 10kV distribution network systems that the present invention carries out.Wherein, passage ch1 represents the A phase voltage, and passage ch2 represents the B phase voltage, and passage ch3 represents the C phase voltage, and passage ch4 represents the open delta winding voltage.
Fig. 4 is the harmonic elimination experimental waveform of the controllable damp device of a kind of ferromagnetic resonance for electromagnetic voltage transformer for distribution network of the present invention.Wherein, passage ch5 shows the A phase voltage, and passage ch6 represents the B phase voltage, and passage ch7 represents the C phase voltage, and passage ch8 represents the open delta winding voltage.
Embodiment
Fig. 1～Fig. 4 is a kind of embodiment of the present invention.The controllable damp device main circuit is damping reactor 4 of series connection after two thyristor 5 inverse parallels, forms the main circuit 3 of a thyristor controlled reactor topological structure, and the two ends of main circuit 3 are connected to the two ends of PT secondary side open delta winding 2.Controller 6 by the 89C51 single-chip microcomputer as control core, by the measurement of AD574 enforcement to the port residual voltage of PT open delta winding, P1 mouth by 89C51 produces trigger impulse, and pulse is by implementing the gate pole triggering to two inverse parallel controllable silicons 5 in the device main circuit behind photoelectric isolating device, Darlington power driving circuit and the pulse transformer.Controller 6 sends or block trigger impulse can control opening of inverse parallel controllable silicon 5 and shutoff naturally.
Under the normal condition, SCR control pulse controlled device 6 is blocked, and controllable silicon is in blocking state, and open delta winding 2 ports of PT secondary side are open-circuit condition.In case resonance or system single-phase earth fault take place, and residual voltage can appear in open delta winding 2 ports, this voltage will excite controller 6 to start the frequency of fft algorithm detectable voltage signals, remove silicon controlled pulse blocking then, trigger controllable silicon.Controllable silicon enters fully conducting state, and damping reactor 4 is inserted at the two ends of PT open delta winding 2.For resonance, reactor can absorb resonant energy, reaches the harmonic elimination purpose; If single phase ground fault, reactor can limit PT open delta winding 2 electric currents, protection PT.Behind 2 power frequency cycles, controllable silicon recovers blocking-up, and PT open delta winding 2 ports are got back to open-circuit condition.
The resonance detection scheme of controllable damp device is, on-line monitoring PT secondary side open delta winding port voltage, under the normal condition, PT open delta winding port voltage is about zero, if PT ferro resonance or single phase ground fault take place in system, then residual voltage can appear in PT open delta winding port.Start the main frequency spectrum that fast Fourier transform (FFT) extracts voltage signal with this residual voltage, can directly judge frequency division or high-frequency resonant have taken place, implement the damping action.If the zero sequence signal frequency that FFT extracts is a fundamental frequency, then implement damping control in advance, if after the controllable damp device action, the port zero sequence signal disappears, what then can decision-making system have just taken place is fundamental resonance, if after the controllable damp device action, the port zero sequence signal still exists, then system's generation single phase ground fault.
Claims (1)
1. the controllable damp device of a ferromagnetic resonance for electromagnetic voltage transformer for distribution network, it is characterized in that: this device comprises: damping reactor (4), inverse parallel controllable silicon (5), trigger controller (6); Damping reactor (4) and inverse parallel controllable silicon (5) series connection constitute damping control main circuit (3), are connected to electromagnetic potential transformer secondary side open delta winding (2) two ends; Under the normal condition, the SCR control pulse controller (6) that is triggered blocks, and controllable silicon is in blocking state, and open delta winding (2) port of electromagnetic potential transformer secondary side is an open-circuit condition; In case resonance or system single-phase earth fault take place, residual voltage can appear in open delta winding (2) port, this voltage will trigger the frequency that controller (6) starts the fast fourier algorithm detectable voltage signals, trigger controller then and remove silicon controlled pulse blocking, trigger controllable silicon; Controllable silicon enters fully conducting state, and electromagnetic potential transformer open delta winding (2) port inserts damping reactor (4); For resonance, damping reactor can absorb resonant energy, reaches the harmonic elimination purpose; If single phase ground fault, damping reactor restriction electromagnetic potential transformer open delta winding (2) electric current, protection electromagnetic potential transformer; Begin through behind two power frequency cycles from resonance or system single-phase earth fault, controllable silicon recovers blocking-up, and electromagnetic potential transformer open delta winding (2) port is got back to open-circuit condition.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101235594A CN100373728C (en) | 2005-11-21 | 2005-11-21 | Controllable damp device of ferromagnetic resonance for electromagnetic voltage transformer for distribution network |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101235594A CN100373728C (en) | 2005-11-21 | 2005-11-21 | Controllable damp device of ferromagnetic resonance for electromagnetic voltage transformer for distribution network |
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| CN1776986A CN1776986A (en) | 2006-05-24 |
| CN100373728C true CN100373728C (en) | 2008-03-05 |
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| CNB2005101235594A Expired - Fee Related CN100373728C (en) | 2005-11-21 | 2005-11-21 | Controllable damp device of ferromagnetic resonance for electromagnetic voltage transformer for distribution network |
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| CN103997029B (en) * | 2014-06-10 | 2016-11-02 | 重庆大学 | Ferro-resonance over-voltage adaptive control system and control method thereof |
| CN104377676A (en) * | 2014-10-31 | 2015-02-25 | 国家电网公司 | PT intelligent resonance elimination device for power distribution network |
| CN105552867A (en) * | 2015-12-21 | 2016-05-04 | 中国西电电气股份有限公司 | Device and method for inhibiting ferromagnetic resonance in high-voltage grid GIS |
| CN106207970B (en) * | 2016-08-17 | 2018-07-20 | 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 number |
| CN107957539B (en) * | 2018-01-15 | 2018-10-02 | 云南电网有限责任公司电力科学研究院 | A kind of electromagnetic potential transformer first winding tail end insulation detecting method and device |
| CN108767815B (en) * | 2018-07-17 | 2024-02-02 | 云南电网有限责任公司红河供电局 | Automatic bypass resonance elimination device of electromagnetic voltage transformer |
| CN109086562B (en) * | 2018-10-09 | 2023-09-12 | 云南电网有限责任公司红河供电局 | High-damping anti-resonance electromagnetic voltage transformer and mutual inductance method |
| CN110829373A (en) * | 2019-11-14 | 2020-02-21 | 国网山东省电力公司潍坊市寒亭区供电公司 | Anti-excitation current electromagnetic voltage transformer |
| CN111426865B (en) * | 2020-04-03 | 2022-05-17 | 珠海市联电科技有限公司 | PT intelligent blocking device and method for power line |
| CN113671239B (en) * | 2021-08-10 | 2023-08-15 | 国网湖南省电力有限公司 | Intelligent overvoltage identification method, device and system for high-voltage switch PT cabinet |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10243549A (en) * | 1997-02-27 | 1998-09-11 | Mitsubishi Electric Corp | Ferro-resonance monitoring and protecting device |
| JP2000164441A (en) * | 1998-11-26 | 2000-06-16 | Mitsubishi Electric Corp | Potential transformer device |
| WO2005008859A1 (en) * | 2003-07-17 | 2005-01-27 | Abb Sp. Z O. O. | A protection system for medium-voltage potential transformers |
| CN2702502Y (en) * | 2004-03-04 | 2005-05-25 | 保定浪拜迪电气股份有限公司 | A ferromagnetic resonance diagnostic eliminator of voltage transformer |
-
2005
- 2005-11-21 CN CNB2005101235594A patent/CN100373728C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10243549A (en) * | 1997-02-27 | 1998-09-11 | Mitsubishi Electric Corp | Ferro-resonance monitoring and protecting device |
| JP2000164441A (en) * | 1998-11-26 | 2000-06-16 | Mitsubishi Electric Corp | Potential transformer device |
| WO2005008859A1 (en) * | 2003-07-17 | 2005-01-27 | Abb Sp. Z O. O. | A protection system for medium-voltage potential transformers |
| CN2702502Y (en) * | 2004-03-04 | 2005-05-25 | 保定浪拜迪电气股份有限公司 | A ferromagnetic resonance diagnostic eliminator of voltage transformer |
Non-Patent Citations (1)
| Title |
|---|
| 中性点不接地电网中铁磁谐振的分析与抑制研究. 周丽霞，尹忠东，彭军.四川电力技术，第4期. 2005 * |
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