CN103616615A - Single-phase earth fault locating method of power distribution network - Google Patents
Single-phase earth fault locating method of power distribution network Download PDFInfo
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- CN103616615A CN103616615A CN201310632554.9A CN201310632554A CN103616615A CN 103616615 A CN103616615 A CN 103616615A CN 201310632554 A CN201310632554 A CN 201310632554A CN 103616615 A CN103616615 A CN 103616615A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a single-phase earth fault locating method of a power distribution network. The method comprises the following steps that (1) power distribution network fault indicators are mounted on all nodes and branches of the power distribution network, and three power distribution network fault indicators which are located on the same circuit and different in phase are used for comparing three-phase transient current information in real time to judge if faults happen; (2) fault information of all circuits is sent to a monitoring center to judge fault places. The method is simple and can be used for quickly judging fault positions.
Description
Technical field
The present invention relates to a kind of localization method, particularly a kind of one-phase earthing failure in electric distribution network localization method.
Background technology
The medium voltage distribution network of China 6kV-35kV adopts isolated neutral mode or neutral by arc extinction coil grounding mode mostly at present, is called neutral non-effective grounding mode, or small current neutral grounding system.After power distribution network generation singlephase earth fault, fault-location problem does not obtain fine solution for a long time, has affected power supply reliability and economy.Conventional single-phase earth fault detecting method is as follows:
1) higher hamonic wave zero-sequence component on-line measurement method
Mainly be used in transformer station and carry out failure line selection, detect online 5 times or the direction of the zero-sequence component of nth harmonic electric current, relatively the size of each line harmonic current zero sequence component.The non-linear factor such as trouble spot and line facility can produce harmonic current, and wherein 5 subharmonic and nth harmonic component are main.While the compensating action of 5 subharmonic being only equivalent to power frequency due to arc suppression coil 1/25, when the compensating action of nth harmonic is only equivalent to power frequency 1/120, therefore under general condition in the zero-sequence current of faulty line 5 times and 11 subharmonic currents than non-fault line greatly and opposite direction, can determine faulty line accordingly.But harmonic content is less in zero-sequence current, and fluctuation is larger, can not guarantee the reliability of protection.The amplitude of zero-sequence current higher harmonic components and direction detect online for failure line selection in general Ke transformer station.
2) higher hamonic wave zero-sequence component off-line measurement method
Utilize this principle, also can make offline model earth fault detection instrument, hand-held detection instrument, 5 times and 11 subharmonic magnetic fields size and Zero-pharse harmonic electric field that can offline inspection zero-sequence current.During use, stand in overhead transmission line below and detect respectively 5 subharmonic and 11 subharmonic current magnetic fields, utilize the electric field electric potential gradient of testing stand hollow wire to detect zero sequence higher harmonic voltage component simultaneously, thereby carry out power direction detection, amplitude and the direction of the zero-sequence current higher harmonic components of more different outlets and different branched lines, thereby failure judgement outlet and fault branch.This ground location instrument has good effect in rural area and suburb overhead transmission line, joint uses many circuits and the situation that has other communicate by letter power circuit bridges to establish, and need manually detect along the line but be not suitable for city net.
3) real component method
Real component in the zero-sequence current of transformer station's each circuit of outlet detection, carry out failure line selection, sometimes need to be in the system of neutral by arc extinction coil grounding, below coil, connect a resistance or at coil two ends a resistance in parallel, to produce real component.This method is generally used in transformer station's route selection, while using on the line, because will detect the real component in zero-sequence component, can only therefore expense is higher, be not suitable for a large amount of installations with special measurement mechanism or FTU, is difficult to navigate to fault branch and trouble spot.
4) power direction
Input zero-sequence current, residual voltage, carry out Fourier analysis calculating, and the meritorious the maximum of zero sequence is fault outlet, is generally used in transformer station's route selection, can not be for localization of fault.
5) transient signal measurements and calculations method
Utilize the transient state process of the charge and discharge process generation of ground connection moment distributed capacitance, measure transient zero-sequence current, residual voltage, failure judgement direction and estimation fault distance, have first half-wave method, differential equation method, Fourier transform, least square fitting method etc.These methods are calculated fault distance and are still had not little error, and are difficult to locate fault branch and trouble spot in multiple-limb situation.
6) Injection Current method
The signal (higher than power frequency, as 8OHz) that injects a particular frequencies at the fault phase that singlephase earth fault Hou， transformer station occurs, then detects failure judgement branch and trouble spot with off-line equipment.But non-fault line is very long and faulty line more in short-term, judge more difficult.
7) zero sequence node-pair method
Zero sequence loop while normally moving according to electrical network, utilize the corresponding change of the suitable off resonance situation of arc suppression coil and displacement voltage, can calculate admittance over the ground and the admittance coefficient of every outlet, reference value using it as corresponding outlet stores, during fault, be equivalent to electrical network and added an asymmetrical power supply, can cause the change of outlet admittance coefficient.Before and after more every line fault, the variation of admittance coefficient, can determine faulty line.The method sensitivity is used compared with Gao，Yi European countries.But need arc suppression coil to be used in conjunction with, the system that isolated neutral system or arc suppression coil can not regulate is automatically not suitable for using.The method is not suitable for locating on the line trouble spot, can only be according to the zero sequence admittance change of outlet, failure judgement outlet.
8) remnant current increment method
Under individual event continuous earth failure condition, if change the off resonance degree (or resistance of damping resistance) of arc suppression coil, only have the zero-sequence current (aftercurrent of trouble spot) in faulty line to change thereupon.Therefore,, by contrasting the variation of each outlet zero-sequence current before and after off resonance degree changes, change the maximum faulty line that is.Sensitivity, the reliability of the method are higher, are adapted at transformer station and carry out earth fault line selection, and shortcoming is that the system that can not automatically regulate earth-free and arc suppression coil is inapplicable, and can not locate trouble spot.
9) neutral grounding by small resistance
After there is singlephase earth fault; at neutral point, access in short-term a small resistor; to produce larger zero-sequence component; in transformer station's outlet configuration zero-sequenceprotection; guarantee fault outlet tripping operation; but for utilizing the transient fault that arc suppression coil just can blow-out, produced on the contrary unnecessary power failure, increased power off time.
10) dynamic resistive load throw-in play
Dynamically resistive load throw-in play cardinal principle is, in transformer station, an automatic controlled resistive load device (being signal source) is installed, when there is singlephase earth fault, at transformer station's neutral point (or neutral point of ground connection change, during without neutral point, can be connected on bus) dynamic resistive load device automatically drop in short-term, between transformer station and on-the-spot earth point, produce special little marking current (maximum is not more than 40A), this marking current is by the load current being modulated on fault phase, be arranged on the earth-fault indicator that install at transformer station's outlet and circuit take-off point place, detect this current signal, can indicate by auto-action, reach the object of indication fault.This method effect is better, but need to install medium resistance and throwing and device additional.
In said method, have plenty of and be only suitable for using in transformer station, have plenty of while using on the line, accuracy is poor, or expense is too high, and being only suitable for of having used in special system, is not suitable for promoting in distribution system.
Summary of the invention
The object of the present invention is to provide a kind of one-phase earthing failure in electric distribution network localization method.
The technical solution that realizes the object of the invention is: a kind of one-phase earthing failure in electric distribution network localization method, comprises the following steps:
Step 1, on each node of power distribution network and each branch line, distribution network failure indicator is all installed, the current information in the real-time detection corresponding node of this distribution network failure indicator;
Step 2, the transient current direction of the three-phase node of the same circuit measuring is compared, if three-phase transient current direction is different, judge that this three-phase node is malfunctioning node;
Step 3, failure judgement circuit, if the three-phase node of the electric current inflow direction of a circuit is malfunctioning node, the three-phase node of outflow of bus current direction is non-malfunctioning node, this circuit is faulty line.
Compared with prior art, its remarkable advantage is in the present invention: one-phase earthing failure in electric distribution network localization method of the present invention is simple, fast failure judgement position.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is distribution line exemplary plot of the present invention.
Embodiment
In conjunction with Figure of description, a kind of one-phase earthing failure in electric distribution network localization method of the present invention, comprises the following steps:
Step 1, on each node of power distribution network and each branch line, distribution network failure indicator is all installed, the current information in the real-time detection corresponding node of this distribution network failure indicator;
Step 2, the transient current direction of the three-phase node of the same circuit measuring is compared, if three-phase transient current direction is different, judge that this three-phase node is malfunctioning node;
Step 3, failure judgement circuit, if the three-phase node of the electric current inflow direction of a circuit is malfunctioning node, the three-phase node of outflow of bus current direction is non-malfunctioning node, this circuit is faulty line.
Be specifically described below:
In conjunction with Fig. 1, Fig. 1 is a kind of simple grounding through arc distribution figure, fault detector is all contained in the front end of every circuit, suppose, at the A of branched line 3, singlephase earth fault occurs mutually, the transient state process of ground current be substantially whole circuit A mutually all electric capacity by earth point, discharge, B phase and C mutually all capacitance currents flow to power supply direction, and via A phase circuit, flow to earth point by mains side.So the transient state capacitance current direction of B phase and C phase is source current in the other direction, the transient current direction before A phase circuit trouble spot is source current direction, and the transient current direction after fault is the opposite direction of source current direction.Whether be malfunctioning node, if the three-phase node of the electric current inflow direction of a circuit is malfunctioning node, the three-phase node of outflow of bus current direction is non-malfunctioning node if utilizing said method can judge three-phase node, this circuit is faulty line.Therefore by judgement A, B, C three-phase transient current direction can be for failure judgement region.
As from the foregoing, this one-phase earthing failure in electric distribution network localization method is simple, fast failure judgement position.
Claims (1)
1. an one-phase earthing failure in electric distribution network localization method, is characterized in that, comprises the following steps:
Step 1, on each node of power distribution network and each branch line, distribution network failure indicator is all installed, the current information in the real-time detection corresponding node of this distribution network failure indicator;
Step 2, the transient current direction of the three-phase node of the same circuit measuring is compared, if three-phase transient current direction is different, judge that this three-phase node is malfunctioning node;
Step 3, failure judgement circuit, if the three-phase node of the electric current inflow direction of a circuit is malfunctioning node, the three-phase node of outflow of bus current direction is non-malfunctioning node, this circuit is faulty line.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103956897A (en) * | 2014-01-26 | 2014-07-30 | 广东美的制冷设备有限公司 | Power-consumption control circuit, intelligent power module and variable-frequency household appliance |
| CN105067960A (en) * | 2015-09-17 | 2015-11-18 | 珠海汇智电力科技有限公司 | Distribution network fault location system based on big data and method thereof |
| CN106370975A (en) * | 2016-08-18 | 2017-02-01 | 国家电网公司 | Power distribution automation system's single-phase grounding section precisely positioning method |
| CN107831378A (en) * | 2017-09-13 | 2018-03-23 | 梅素真 | A kind of device and method for examining arc suppression coil compensation effect |
| CN114062837A (en) * | 2021-10-15 | 2022-02-18 | 中山市沃尔沃照明科技有限公司 | Urban road and park lighting system monitoring method and device based on big data |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956897A (en) * | 2014-01-26 | 2014-07-30 | 广东美的制冷设备有限公司 | Power-consumption control circuit, intelligent power module and variable-frequency household appliance |
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| CN105067960A (en) * | 2015-09-17 | 2015-11-18 | 珠海汇智电力科技有限公司 | Distribution network fault location system based on big data and method thereof |
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| CN106370975A (en) * | 2016-08-18 | 2017-02-01 | 国家电网公司 | Power distribution automation system's single-phase grounding section precisely positioning method |
| CN106370975B (en) * | 2016-08-18 | 2018-11-02 | 国家电网公司 | A kind of pinpoint method of electrical power distribution automatization system single-phase earthing section |
| CN107831378A (en) * | 2017-09-13 | 2018-03-23 | 梅素真 | A kind of device and method for examining arc suppression coil compensation effect |
| CN107831378B (en) * | 2017-09-13 | 2020-06-30 | 梅素真 | Device and method for detecting compensation effect of arc suppression coil |
| CN114062837A (en) * | 2021-10-15 | 2022-02-18 | 中山市沃尔沃照明科技有限公司 | Urban road and park lighting system monitoring method and device based on big data |
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