CN104113049A - Single-phase grounding fault self-recovery system - Google Patents
Single-phase grounding fault self-recovery system Download PDFInfo
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- CN104113049A CN104113049A CN201410341979.9A CN201410341979A CN104113049A CN 104113049 A CN104113049 A CN 104113049A CN 201410341979 A CN201410341979 A CN 201410341979A CN 104113049 A CN104113049 A CN 104113049A
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Abstract
The invention provides a single-phase grounding fault self-recovery system. The single-phase grounding fault self-recovery system comprises a single-phase grounding fault detection unit, a loop closing running unit and a grounding line isolation unit, wherein the single-phase grounding fault detection unit monitors power frequency zero sequence voltage of a power distribution system in real time, judges whether single-phase grounding faults occur in the power distribution system, detects zero mode voltage travelling waves and zero mode current travelling waves of a power distribution line in real time and judges whether single-phase grounding faults occur in the power distribution line; the loop closing running unit sends instructions of turning off an interconnection switch at the tail end of a closed line after judging that the single-phase grounding faults occur; the grounding line isolation unit is used for sending instructions of turning on a load side switch of a grounding section after the interconnection switch at the tail end of the line is turned on, and sending instructions of turning on a power source side switch of the grounding section after the load side switch of the grounding section is turned on so as to isolate the grounding section from the power distribution system. According to the technical scheme, automatic quick isolation of the single-phase grounding faults of a neutral point non-effective grounding system is achieved, and a load cannot lose power in the fault isolation process.
Description
Technical field
The present invention relates to protecting electrical power system and control technology field, in particular to a kind of single-phase earth fault self-healing system.
Background technology
Fault self-recovery refers to without or only needs a small amount of human intervention, just can realize the isolation of in-problem components and parts in electric power networks or make it recover normal operation, avoids user's power failure or makes the minimal time of power failure.The core of intelligent power distribution network construction is to realize system self-healing, and the content of self-healing comprises automatic trouble diagnosis, Fault Isolation and system self-recovery, and the target of self-healing is to avoid load to have a power failure, to guarantee the reliability to customer power supply.
Distribution line is directly connected with load, and the safe and reliable operation direct relation of distribution line the reliability of load power supply, yet distribution line failure is inevitable.Around the processing of distribution line failure, work about electric power person has carried out research extensively and profoundly: around short trouble, proposed distribution line automatic technology; Around the single phase ground fault that does not form short-circuit loop, single-phase grounding selecting technology has been proposed.Wherein, distribution line automatic technology is after short trouble occurs, and judges fast fault, realizes Fault Isolation, after Fault Isolation, recovers dead electricity load; And single-phase grounding selecting technology is after single phase ground fault occurs, select ground path, then by manually excising ground path, isolated fault.Above distribution line failure treatment technology is all in order to protect the safety of power equipment, when fault occurs, first faulty line to be isolated from system.Yet existing power distribution network generally adopts closed-loop structure, open loop operation, the arbitrary power circuit in the power distribution network of load power supply because of fault, be forced to out of service after, this power circuit with load have to have a power failure, to user, caused inconvenience.
Therefore, how to make power distribution network carry out fault self-recovery on the basis that does not affect load power supply, become technical problem urgently to be resolved hurrily at present.
Summary of the invention
The present invention, just based on the problems referred to above, has proposed a kind of new technical scheme, can make power distribution network carry out fault self-recovery on the basis that does not affect load power supply.
In view of this, the present invention proposes a kind of single-phase earth fault self-healing system, comprise: phase-to-ground fault detection unit, power frequency residual voltage in Real-Time Monitoring distribution system, judge whether single phase ground fault has occurred in described distribution system, and detect in real time zero mode voltage row ripple on distribution line and zero mould current traveling wave, judge whether single phase ground fault has occurred on described distribution line; Cyclization running unit occurs after single phase ground fault on the described distribution line of judgement, sends the instruction of the interconnection switch of closed circuit end; Ground path isolated location, after the interconnection switch closure of described line end, send the instruction of the load side switch of opening ground connection section, and after the load side switch opens of described ground connection section, send the instruction of the mains side switch of opening described ground connection section, described ground connection section is isolated from described distribution system.
In the prior art, distribution line generally adopts the mode of neutral non-effective grounding, specifically comprises: isolated neutral, neutral by arc extinction coil grounding or neutral point are through high resistance ground.During system with non effectively earth ed neutral generation single phase ground fault, can not stop customer power supply immediately.The present invention just on this basis, has realized whether single phase ground fault has occurred in real-time detecting system, and after single phase ground fault occurs, realizes single-phase earth fault self-healing.
In this technical scheme, in system with non effectively earth ed neutral, when system is normally moved, three-phase voltage is symmetrical, and residual voltage is zero.When there is single phase ground fault, Earth Phase lower voltage, perfects phase voltage and raises, and residual voltage raises.When metallic earthing, Earth Phase lower voltage is zero, perfects phase voltage and raises as line voltage, occurs very large residual voltage in system.Therefore, phase-to-ground fault detection unit is the voltage electric parameters based in distribution system, carrys out whether to have occurred in decision-making system single phase ground fault.For example, voltage transformer open delta side measuring voltage that can be based on system busbar, when system is normally moved, voltage transformer open delta side measuring voltage is only system unbalance voltage, and during system generation single phase ground fault, it is the phase voltage of three times that voltage transformer open delta side measuring voltage raises.In addition, while there is single-phase earthing in power distribution network, fault point will produce fault traveling wave.According to EM theory, the fault traveling wave that fault point produces is propagated in will be along faulty line to system, when fault traveling wave arrives measurement point bus, to there is at bus place catadioptric in fault traveling wave, non-fault line is entered in the transmission of part fault traveling wave, part fault traveling wave is reflected back faulty line, and the initial row ripple that faulty line is experienced is the stack of incident row ripple and reflected traveling wave.
Ground path Fault Isolation comprises that ground connection section mains side and load side two ends isolate from system, the isolation of traditional distribution system ground path is the circuit breaker of first deenergization side, open again the circuit breaker of load side, the feature of this isolation mode is after mains side circuit breaker is opened, load dead electricity, can not meet the requirement of fault self-recovery.And cyclization running unit in the present invention is first closed circuit end interconnection switch, realize operation with closed ring in short-term, guarantee to load not dead electricity.
Ground path isolated location is the nucleus module of self-healing process.After line end interconnection switch closure, open the switch of single phase ground fault section load side, and after ground connection section load side switch opens, open the switch of ground connection section mains side.So just guarantee the ground path not dead electricity of loading in isolation processes, met the requirement of fault self-recovery.
In technique scheme, preferably, described phase-to-ground fault detection unit is by judging whether described zero mode voltage row ripple on described distribution line and the polarity of described zero mould current traveling wave judge whether to have occurred single phase ground fault on the contrary.
In this technical scheme, when external area error, the row ripple detecting on distribution line is direct wave, and voltage traveling wave is identical with the polarity of current traveling wave; When troubles inside the sample space, the row ripple returning wave detecting on circuit and the stack of direct wave, voltage traveling wave is contrary with the polarity of current traveling wave.Therefore, the polar character of the zero mode voltage row ripple based on circuit and zero mould current traveling wave, can realize distribution circuit single-phase earth fault and detect.
By technical scheme of the present invention, can make power distribution network carry out fault self-recovery on the basis that does not affect load power supply, guaranteed the reliability of power supply.
Accompanying drawing explanation
Fig. 1 shows the schematic block diagram of single-phase earth fault self-healing system according to an embodiment of the invention.
Embodiment
In order more clearly to understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.
Set forth in the following description a lot of details so that fully understand the present invention, still, the present invention can also adopt other to be different from other modes described here and implement, and therefore, the present invention is not limited to the restriction of following public specific embodiment.
Fig. 1 shows the schematic block diagram of single-phase earth fault self-healing system according to an embodiment of the invention.
As shown in Figure 1, single-phase earth fault self-healing system 100 according to an embodiment of the invention, comprise: phase-to-ground fault detection unit 102, power frequency residual voltage in Real-Time Monitoring distribution system, judge whether single phase ground fault has occurred in distribution system, and detect in real time zero mode voltage row ripple on distribution line and zero mould current traveling wave, judge whether single phase ground fault has occurred on distribution line; Cyclization running unit 104 occurs after single phase ground fault on judgement distribution line, sends the instruction of the interconnection switch of closed circuit end; Ground path isolated location 106, after the interconnection switch closure of line end, send the instruction of the load side switch of opening ground connection section, and after the load side switch opens of ground connection section, send the instruction of the mains side switch of opening ground connection section, ground connection section is isolated from distribution system.
In the prior art, distribution line generally adopts the mode of neutral non-effective grounding, specifically comprises: isolated neutral, neutral by arc extinction coil grounding or neutral point are through high resistance ground.During system with non effectively earth ed neutral generation single phase ground fault, can not stop customer power supply immediately.The present invention just on this basis, has realized whether single phase ground fault has occurred in real-time detecting system, and after single phase ground fault occurs, realizes single-phase earth fault self-healing.
In this technical scheme, in system with non effectively earth ed neutral, when system is normally moved, three-phase voltage is symmetrical, and residual voltage is zero.When there is single phase ground fault, Earth Phase lower voltage, perfects phase voltage and raises, and residual voltage raises.When metallic earthing, Earth Phase lower voltage is zero, perfects phase voltage and raises as line voltage, occurs very large residual voltage in system.Therefore, phase-to-ground fault detection unit 102 is the voltage electric parameters based in distribution system, carrys out whether to have occurred in decision-making system single phase ground fault.For example, voltage transformer open delta side measuring voltage that can be based on system busbar, when system is normally moved, voltage transformer open delta side measuring voltage is only system unbalance voltage, and during system generation single phase ground fault, it is the phase voltage of three times that voltage transformer open delta side measuring voltage raises.In addition, while there is single-phase earthing in power distribution network, fault point will produce fault traveling wave.According to EM theory, the fault traveling wave that fault point produces is propagated in will be along faulty line to system, when fault traveling wave arrives measurement point bus, to there is at bus place catadioptric in fault traveling wave, non-fault line is entered in the transmission of part fault traveling wave, part fault traveling wave is reflected back faulty line, and the initial row ripple that faulty line is experienced is the stack of incident row ripple and reflected traveling wave.
Ground path Fault Isolation comprises that ground connection section mains side and load side two ends isolate from system, the isolation of traditional distribution system ground path is the circuit breaker of first deenergization side, open again the circuit breaker of load side, the feature of this isolation mode is after mains side circuit breaker is opened, load dead electricity, can not meet the requirement of fault self-recovery.And are first closed circuit end interconnection switches in cyclization running unit 104 of the present invention, realize operation with closed ring in short-term, guarantee to load not dead electricity.
Ground path isolated location 106 is nucleus modules of self-healing process.After line end interconnection switch closure, open the switch of single phase ground fault section load side, and after ground connection section load side switch opens, open the switch of ground connection section mains side.So just guarantee the ground path not dead electricity of loading in isolation processes, met the requirement of fault self-recovery.
In technique scheme, preferably, phase-to-ground fault detection unit 102 is by judging whether the zero mode voltage row ripple on distribution line judges whether to have occurred single phase ground fault on the contrary with the polarity of zero mould current traveling wave.
In this technical scheme, when external area error, the row ripple detecting on distribution line is direct wave, and voltage traveling wave is identical with the polarity of current traveling wave; When troubles inside the sample space, the row ripple returning wave detecting on circuit and the stack of direct wave, voltage traveling wave is contrary with the polarity of current traveling wave.Therefore, the polar character of the zero mode voltage row ripple based on circuit and zero mould current traveling wave, can realize distribution circuit single-phase earth fault and detect.
More than be described with reference to the accompanying drawings technical scheme of the present invention, by technical scheme of the present invention, can have made power distribution network carry out fault self-recovery on the basis that does not affect load power supply, guaranteed the reliability of power supply.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (2)
1. a single-phase earth fault self-healing system, is characterized in that, comprising:
Phase-to-ground fault detection unit, power frequency residual voltage in Real-Time Monitoring distribution system, judge whether single phase ground fault has occurred in described distribution system, and detect in real time zero mode voltage row ripple on distribution line and zero mould current traveling wave, judge whether single phase ground fault has occurred on described distribution line;
Cyclization running unit occurs after single phase ground fault on the described distribution line of judgement, sends the instruction of the interconnection switch of closed circuit end;
Ground path isolated location, after the interconnection switch closure of described line end, send the instruction of the load side switch of opening ground connection section, and after the load side switch opens of described ground connection section, send the instruction of the mains side switch of opening described ground connection section, described ground connection section is isolated from described distribution system.
2. single-phase earth fault self-healing system according to claim 1, it is characterized in that, described phase-to-ground fault detection unit is by judging whether described zero mode voltage row ripple on described distribution line and the polarity of described zero mould current traveling wave judge whether to have occurred single phase ground fault on the contrary.
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| CN201410341979.9A CN104113049A (en) | 2014-07-17 | 2014-07-17 | Single-phase grounding fault self-recovery system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164354A (en) * | 2018-09-29 | 2019-01-08 | 云南电网有限责任公司电力科学研究院 | A kind of method of locating terminal of the distribution wide area self-healing system based on passive optical network |
| CN110146766A (en) * | 2018-11-16 | 2019-08-20 | 国网江苏省电力有限公司盐城供电分公司 | The processing method of single-phase earthing signal in a kind of Loop Closing Operation |
| CN112436479A (en) * | 2020-11-12 | 2021-03-02 | 贵州电网有限责任公司 | Self-adaptive protection device suitable for distribution lines |
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| JPH02206325A (en) * | 1989-02-02 | 1990-08-16 | Hitachi Ltd | Distribution line protective device |
| CN102148495A (en) * | 2011-03-03 | 2011-08-10 | 清华大学 | Single-phase earth fault self-healing device and system |
| CN102185290A (en) * | 2011-03-03 | 2011-09-14 | 清华大学 | Self-recovering method of single-phase earth faults |
| CN102780212A (en) * | 2012-07-20 | 2012-11-14 | 清华大学 | Single-phase grounding traveling-wave protection device for distribution line |
| CN103138390A (en) * | 2011-11-24 | 2013-06-05 | 新疆电力公司电力科学研究院 | Power distribution network fault handling method based on self-recovering control |
| CN103280780A (en) * | 2013-05-07 | 2013-09-04 | 清华大学 | Fault self-healing method for neutral point non-effective earthing system |
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2014
- 2014-07-17 CN CN201410341979.9A patent/CN104113049A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH02206325A (en) * | 1989-02-02 | 1990-08-16 | Hitachi Ltd | Distribution line protective device |
| CN102148495A (en) * | 2011-03-03 | 2011-08-10 | 清华大学 | Single-phase earth fault self-healing device and system |
| CN102185290A (en) * | 2011-03-03 | 2011-09-14 | 清华大学 | Self-recovering method of single-phase earth faults |
| CN103138390A (en) * | 2011-11-24 | 2013-06-05 | 新疆电力公司电力科学研究院 | Power distribution network fault handling method based on self-recovering control |
| CN102780212A (en) * | 2012-07-20 | 2012-11-14 | 清华大学 | Single-phase grounding traveling-wave protection device for distribution line |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164354A (en) * | 2018-09-29 | 2019-01-08 | 云南电网有限责任公司电力科学研究院 | A kind of method of locating terminal of the distribution wide area self-healing system based on passive optical network |
| CN110146766A (en) * | 2018-11-16 | 2019-08-20 | 国网江苏省电力有限公司盐城供电分公司 | The processing method of single-phase earthing signal in a kind of Loop Closing Operation |
| CN110146766B (en) * | 2018-11-16 | 2021-09-03 | 国网江苏省电力有限公司盐城供电分公司 | Method for processing single-phase grounding signal in closed-loop operation |
| CN112436479A (en) * | 2020-11-12 | 2021-03-02 | 贵州电网有限责任公司 | Self-adaptive protection device suitable for distribution lines |
| CN112436479B (en) * | 2020-11-12 | 2022-05-06 | 贵州电网有限责任公司 | Self-adaptive protection device suitable for distribution lines |
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Application publication date: 20141022 |