CN103236687B - Short-time controllable reactor compensation method - Google Patents
Short-time controllable reactor compensation method Download PDFInfo
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- CN103236687B CN103236687B CN201310138706.XA CN201310138706A CN103236687B CN 103236687 B CN103236687 B CN 103236687B CN 201310138706 A CN201310138706 A CN 201310138706A CN 103236687 B CN103236687 B CN 103236687B
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Abstract
The invention relates to a short-time controllable reactor compensation method, belonging to the field of emergency protection devices. The compensation method comprises the steps that when a ground fault occurs in a power distribution network, inductive current which is needed to be compensated is calculated according to measured grid capacitive current value, then a controllable reactor is controlled to output compensation current; for a common transient ground fault, after the inductive current is compensated, the ground fault is automatically eliminated and a normal state is restored; and as to the situation that the ground fault still exists after preset time after the controllable reactor compensates the current, a permanent ground fault is deemed to occur in a system, a high-voltage switch is automatically turned off after the time duration of grounding exceeds the preset time, and a small resistance is switched on to enable feeder line protection to act to cut off a faulty line by virtue of switch trip. By adopting a neutral point joint grounding mode, the joint use of the controllable reactor and the small resistor is realized, the duration of the ground fault is judged to distinguish the transient ground fault from the permanent ground fault, different countermeasures are adopted and so the goal of improving power supply safety and reliability is achieved.
Description
Technical field
The invention belongs to transformer station's emergency protective device field, particularly relate to a kind of processing method for substation grounding fault.
Background technology
At present, the power network neutral point earth point mode of electric power system 35kV and following electric pressure mainly contains following several: one, isolated neutral; Two, Neutral Grounding through Resistance in Electrical (in low resistance grounding mode); Three, resonance neutral grounding (neutral by arc extinction coil grounding).
In isolated neutral system, when generation one phase fault, the power supply being connected on the current collector on voltage between phases does not meet with destruction, they can continue to run, but at this moment healthy phases voltage raises, insulation weak spot is probably breakdown, thus causes phase ground short circuit, badly damaged electric equipment.
And in isolated neutral system, when the capacitance current of ground connection is larger, the electric arc caused at ground connection place is difficult to self-extinguish, gap arc (namely periodically extinguishing and the electric arc of restriking) also may be there is.Because electrical network is an oscillation circuit with inductance and electric capacity, indirect arc can cause overvoltage relatively, this overvoltage can be transferred on the whole electrical network that to have with earth point and be directly electrically connected, more easily causes another relatively to puncture, and forms two-phase grounding fault.
In the prior art, in order to solve the problem that isolated neutral brings, general employing " grounding through arc " or " low resistance grounding " two kinds of modes.
In above-mentioned earthing mode, the former with neutral point through arc suppression coil (resonance) ground connection for representative, the latter take low resistance earthing as representative.For a long time, both mutual pluses and minuses, have therefore all had suitable development in different countries and regions.
Traditional " grounding through arc " mode can eliminate transient single-phase earth fault automatically, there is the advantage reducing tripping operation number of times, reduce earth fault current, but due to non-transient single phase ground fault can not be excised, the power-frequency overvoltage (line voltage) that whole distribution system must be born the long period (2 hours), therefore require high to the insulation level of equipment, this is disadvantageous to power distribution system equipment (especially for some import equipment, as cable); The long-time existence of single phase ground fault simultaneously is also unfavorable for equipment and personal safety.And the failure line selection inside traditional " grounding through arc " system, be a technical barrier, actual route selection accuracy rate is very low always.
" low-impedance earthed system " mode can avoid distribution system to occur the problem of long-time power-frequency overvoltage, and require relatively low to apparatus insulated, weak point is that in system, any single phase ground fault all trips, and causes trip-out rate too high, reduces power supply reliability.
Therefore, these two kinds of earthing modes all cut both ways, and can only be applicable to certain condition, in the urgent need to seeking a kind of more perfect novel grounded mode.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of short-time controllable reactor compensation method, it has merged the advantage of low resistance grounding technology and grounding through arc technology, can effective compensation instantaneity earth fault, greatly reduce line tripping rate, permanent earth fault can be isolated rapidly again, thus reach the object improving Supply Security and reliability.
Technical scheme of the present invention is: provide a kind of short-time controllable reactor compensation method, is included on substation grounding loop and arranges controlled reactor or small resistor, exports offset current or small resistor restricted grounding current by controlled reactor; Controlled reactor described in it, with automatic control equipment, exports offset current in order to control controlled reactor; Small resistor described in it is connected in series with substation grounding loop by high-voltage switch gear, in order to control input or the excision of small resistor; It is characterized in that: when power distribution network generation earth fault, calculate the inductive current needing to compensate according to the electric network capacitance and current value measured, then control controlled reactor and export offset current; For general instantaneity earth fault, after being compensated by inductive current, arc extinction earth fault eliminates recovery normal condition automatically; After controlled reactor is compensated after a predetermined time after earth fault situation about still existing; then think that system there occurs permanent earth fault; then after the ground connection duration exceedes the scheduled time, automatic closed high switch drops into small resistor; make protection for feed line action, by switch trip excision faulty line.
The scheduled time described in it is 8 ~ 12 seconds.
Preferably, the scheduled time described in it is 10 seconds.
Further, described compensation method is after input small resistor, and controlled reactor exits compensation automatically; When after faulty line isolation, System recover normally runs, and high-voltage switch gear disconnects small resistor automatically.
Further, described compensation method realizes accurately isolated fault circuit fast by the input of small resistor, avoids failure propagation.
Further, described compensation method, by the conbined usage of controlled reactor and small resistor, continues duration to ground connection and judges, distinguishes instant earthing and permanent earth, take different counter-measures, thus reach the object improving Supply Security and reliability.
Further, controlled reactor and small resistor two kinds of grounding apparatuss are integrated consideration by described compensation method, carry out differentiation to the transient earthing in single-phase earthing and permanent earth to treat, take different measures respectively, both ensure that the accurately isolation rapidly to permanent earth fault, and avoided system power frequency overvoltage long-term existence to cause accident to expand further, fine compensation can be carried out to instantaneity earth fault again and make it die away, without the need to tripping operation, improve the safety and reliability of system.
Compared with the prior art, advantage of the present invention is:
Adopt the pattern of neutral point joint grounding, realize the conbined usage of controlled reactor and small resistor, and can realize automatically switching, judge by continuing duration to ground connection, distinguish instant earthing and permanent earth, take different counter-measures, thus reach the object improving Supply Security and reliability.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of short-time controllable reactor compensation method of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
In Fig. 1, technical scheme of the present invention is: provide a kind of short-time controllable reactor compensation method, being included on substation grounding loop controlled reactor or arranging small resistor, the controlled reactor described in it, with automatic control equipment, exports offset current in order to control controlled reactor; Small resistor described in it is connected in series with substation grounding loop by high-voltage switch gear, in order to control input or the excision of small resistor.
Its inventive point is, when power distribution network generation earth fault, calculates the inductive current needing to compensate according to the electric network capacitance and current value measured, and then controls controlled reactor and exports offset current; For general instantaneity earth fault, after being compensated by inductive current, arc extinction earth fault eliminates recovery normal condition automatically; After controlled reactor is compensated after a predetermined time after earth fault situation about still existing; then think that system there occurs permanent earth fault; then after the ground connection duration exceedes the scheduled time, automatic closed high switch drops into small resistor; make protection for feed line action, by switch trip excision faulty line.
The scheduled time described in it is 8 ~ 12 seconds.
Preferably, the scheduled time described in it is 10 seconds.
Further, described compensation method is after input small resistor, and controlled reactor exits compensation automatically; When after faulty line isolation, System recover normally runs, and high-voltage switch gear disconnects small resistor automatically.
Further, described compensation method realizes accurately isolated fault circuit fast by the input of small resistor, avoids failure propagation.
Further, described compensation method, by the conbined usage of controlled reactor and small resistor, continues duration to ground connection and judges, distinguishes instant earthing and permanent earth, take different counter-measures, thus reach the object improving Supply Security and reliability.
Different counter-measure described in it, comprises first, second treatment measures.
Concrete, the first treatment measures described in it comprise the following steps:
Calculate the inductive current needing to compensate according to the electric network capacitance and current value measured, then control controlled reactor and export offset current;
After instantaneity earth fault is compensated by inductive current, arc extinction, earth fault is eliminated automatically, recovers normal condition, to avoid occurring in low resistance grounding mode that one has fault to trip at once to make the situation that line tripping rate is high.
The second treatment measures described in it comprise the following steps:
When the ground connection duration more than 10s after, automatic closed high switch drops into small resistor, makes protection for feed line action, by switch trip excision faulty line;
After dropping into small resistor, controlled reactor exits compensation automatically, and when after faulty line isolation, System recover normally runs, and control device automatically disconnects and exits small resistor.
Further, controlled reactor and small resistor two kinds of grounding apparatuss are integrated consideration by described compensation method, carry out differentiation to the transient earthing in single-phase earthing and permanent earth to treat, take different measures respectively, both ensure that the accurately isolation rapidly to permanent earth fault, and avoided system power frequency overvoltage long-term existence to cause accident to expand further, fine compensation can be carried out to instantaneity earth fault again and make it die away, without the need to tripping operation, improve the safety and reliability of system.
Because controllable impedance compensation of ground mode (be commonly called as grounding through arc mode, lower with) and low resistance grounding mode are prior art, therefore its specific works principle and realize circuit and no longer describe at this.
Shown in the technical program sees the following form compared with the prior art:
Because controlled reactor and small resistor two kinds of grounding apparatuss are integrated consideration by the present invention, differentiation is carried out to the transient earthing in earth fault and permanent earth and treats, take different measures respectively.Avoid the drawback of original single tupe, both the accurately isolation rapidly to permanent earth fault had been ensured, system power frequency overvoltage long-term existence is avoided to cause accident to expand further, can carry out fine compensation to instantaneity earth fault again makes it die away, without the need to tripping operation, improve the safety and reliability of system.
The present invention can be widely used in the system protection field of transformer station.
Claims (2)
1. a short-time controllable reactor compensation method, is included on substation grounding loop and arranges controlled reactor or small resistor, exports offset current or small resistor restricted grounding current by controlled reactor; Controlled reactor described in it, with automatic control equipment, exports offset current in order to control controlled reactor; Small resistor described in it is connected in series with substation grounding loop by high-voltage switch gear, in order to control input or the excision of small resistor; It is characterized in that:
When power distribution network generation earth fault, calculate the inductive current needing to compensate according to the electric network capacitance and current value measured, then control controlled reactor and export offset current;
For general instantaneity earth fault, after being compensated by inductive current, arc extinction earth fault eliminates recovery normal condition automatically;
After controlled reactor is compensated after a predetermined time after earth fault situation about still existing, then think that system there occurs permanent earth fault, then after the ground connection duration exceedes the scheduled time, automatic closed high switch drops into small resistor, make protection for feed line action, by switch trip excision faulty line;
The scheduled time described in it is 8 ~ 12 seconds;
Compensation method described in it is after input small resistor, and controlled reactor exits compensation automatically; When after faulty line isolation, System recover normally runs, and high-voltage switch gear disconnects small resistor automatically;
Compensation method described in it realizes accurately isolated fault circuit fast by the input of small resistor, avoids failure propagation;
Compensation method described in it, by the conbined usage of controlled reactor and small resistor, continues duration to ground connection and judges, distinguishes instant earthing and permanent earth, takes different counter-measures, thus reaches the object improving Supply Security and reliability;
Controlled reactor and small resistor two kinds of grounding apparatuss are integrated consideration by described compensation method, carry out differentiation to the transient earthing in single-phase earthing and permanent earth to treat, take different measures respectively, both ensure that the accurately isolation rapidly to permanent earth fault, system power frequency overvoltage long-term existence is avoided to cause accident to expand further, can carry out fine compensation to instantaneity earth fault again makes it die away, and without the need to tripping operation, improves the safety and reliability of system.
2., according to short-time controllable reactor compensation method according to claim 1, it is characterized in that the described scheduled time is 10 seconds.
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| CN201310138706.XA CN103236687B (en) | 2013-04-19 | 2013-04-19 | Short-time controllable reactor compensation method |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104821559A (en) * | 2015-02-15 | 2015-08-05 | 凯里供电局 | Neutral point joint grounding equipment self-protection method |
| CN110456230B (en) * | 2019-08-29 | 2021-04-27 | 国家电网有限公司 | Power distribution network single-phase earth fault processing method based on dual-mode function |
| CN112117747B (en) * | 2020-09-24 | 2022-09-27 | 云南电网有限责任公司电力科学研究院 | Ground fault current hybrid compensation system and matching method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101183788A (en) * | 2007-12-11 | 2008-05-21 | 广州智光电气股份有限公司 | Power network controlled reactance and small resistor combination type earthing device |
| CN201138751Y (en) * | 2007-12-11 | 2008-10-22 | 广州智光电气股份有限公司 | Earthing set equipment combining power grid controllable reaction with small resistance |
| CN201478828U (en) * | 2009-07-23 | 2010-05-19 | 江苏省电力公司常州供电公司 | Neutral point grounding system of 35 KV power grid |
| EP1935072A4 (en) * | 2005-10-12 | 2011-11-02 | Chevron Usa Inc | A ground-fault circuit-interrupter system for three-phase electrical power systems |
| CN202535052U (en) * | 2012-03-23 | 2012-11-14 | 上海市电力公司 | Neutral point grounding system via combination of reactance and resistor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB0814213D0 (en) * | 2008-08-05 | 2008-09-10 | Rolls Royce Plc | A protection arrangement |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1935072A4 (en) * | 2005-10-12 | 2011-11-02 | Chevron Usa Inc | A ground-fault circuit-interrupter system for three-phase electrical power systems |
| CN101183788A (en) * | 2007-12-11 | 2008-05-21 | 广州智光电气股份有限公司 | Power network controlled reactance and small resistor combination type earthing device |
| CN201138751Y (en) * | 2007-12-11 | 2008-10-22 | 广州智光电气股份有限公司 | Earthing set equipment combining power grid controllable reaction with small resistance |
| CN201478828U (en) * | 2009-07-23 | 2010-05-19 | 江苏省电力公司常州供电公司 | Neutral point grounding system of 35 KV power grid |
| CN202535052U (en) * | 2012-03-23 | 2012-11-14 | 上海市电力公司 | Neutral point grounding system via combination of reactance and resistor |
Non-Patent Citations (1)
| Title |
|---|
| 配网自动化中的单相接地故障识别方法;李娟等;《北京机械工业学院学报》;20050630;第20卷(第2期);第43-46页 * |
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