CN102788936A - Low current grounding fault circuit selection method - Google Patents
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- CN102788936A CN102788936A CN2012103193308A CN201210319330A CN102788936A CN 102788936 A CN102788936 A CN 102788936A CN 2012103193308 A CN2012103193308 A CN 2012103193308A CN 201210319330 A CN201210319330 A CN 201210319330A CN 102788936 A CN102788936 A CN 102788936A
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Abstract
The invention relates to a low current grounding fault circuit selection method. The low current grounding fault circuit selection method is characterized in that a control computer, a small current grounding fault detecting device and a zero sequence current mutual inductor set according to outlet circuit number form a circuit selection device, and low current grounding fault circuit selection is carried out according to the characteristic of single-phase grounding fault transient state signals of a low current grounding grid and utilizing monitored fault transient state signals and the monitored outlet circuit number. A special high-speed data acquisition unit is adopted, and sampling is performed simultaneously; the technology is accomplished by coordination and distribution of responsibilities; zero sequence voltage and current signals are acquired; the transient circuit selection technology has the advantages of reliable detection, high success rate and high metal grounding fault accuracy rate of 100 percent; and in view of high-resistance grounding fault comprehensive circuit selection, the accuracy rate is higher than 95 percent, therefore, the application is wide. The low current grounding fault circuit selection method can be applied to systems of non-grounding, grounding through an arc suppression coil and grounding through high resistance, is adapted to different forms of power supply systems in various voltage grades and has a fault recording function; in addition, the fault information can be reserved permanently and can be uploaded to a scheduling or control center through a variety of protocols.
Description
Technical field
The present invention relates to a kind of electric insulation fault diagnosis technology field, be specifically related to a kind of low-current ground fault line selection field.
Background technology
When small current neutral grounding system has singlephase earth fault, the reason such as faint and trouble spot electric arc instability owing to fault current, the route selection of earth fault and location be difficulty relatively.For a long time, people do a lot of work, and have developed the multiple method of inspection and device, but the actual motion effect is unsatisfactory.Owing to lack reliable failure line selection means, power supply enterprise has to select faulty line with the artificial method on road of drawing mostly.Manual work draws the road can cause non-fault line power supply to interrupt in short-term, influences the normal operation of user power utilization equipment, and this is a kind of huge disaster for the quality of power supply exigent today.Therefore, study a kind of novel low-current ground fault line selection method problem for demanding urgently solving.
Summary of the invention
Defective to prior art exists the objective of the invention is to propose a kind of low-current ground fault line selection method, and the children that it can adapt to differing heights use.
Technical scheme of the present invention is: a kind of low-current ground fault line selection method; It is characterized in that: adopt control computer, low current grounding pick-up unit and zero sequence current mutual inductor is set to constitute line selection apparatus by the outlet way; Characteristic according to the low current neutral grounding electric network single-phase earth fault transient signal; Utilize monitoring fault transient signal, keep watch on the outlet number, carry out low-current ground fault line selection; When distribution network system generation singlephase earth fault; Line selection apparatus adopts residual voltage sudden change variable to start and the comprehensive start-up criterion of residual voltage amplitude; Confirm the fault initial time; Comprehensive start-up criterion is specially the residual voltage last samples value calculating voltage sudden change amount that program monitoring in real time collects, when residual voltage sudden change amount satisfies; If stable permanent singlephase earth fault has taken place in system; And line selection apparatus has excised a non-fault line by error; So whole network shows as residual voltage and still exists and have only a zero-sequence current amplitude in the outlet to change; This circuit is exactly a ground path, and the zero-sequence current amplitude does not all change on all the other circuits, is non-fault line; Set up following route selection criterion: during power distribution network generation single-phase earthing; Residual voltage raises, and adopts residual voltage to start threshold value as entry condition greater than zero sequence, and setting valve is got insulating monitoring voltage; Choose according to system's degree of asymmetry, also can adopt residual voltage sudden change amount as the startup amount; Combine with the route selection technology through the reclosing technology, extinguish ground arc in time, improved power supply reliability; For permanent earth fault,, realize drawing the road assistant criteria through software if falsely drop line; Failure judgement circuit or busbar grounding accurately; Improved the accuracy of route selection, avoided the single-phase earthing overlong time after, develop into the two phase ground short circuit; When low current grounding took place, circuit can move a period of time, but is no more than 2 hours, and the circuit that breaks down needs interruption maintenance; After breaking down, delay time, escape transient earthing fault-time; In line selection apparatus, pass through logic determines, active tripping switch, and then judge whether correct route selection; If falsely drop, realize single shot reclosing, line selection apparatus is correctly chosen faulty line once more through drawing the road auxiliary judgement; Correct excision fault is handled the small current neutral grounding problem according to the thinking of route selection, tripping operation, the correct isolated fault of coincidence, thereby accomplishes earth fault line selection.Have and detect reliably, success ratio is high, metallic earthing fault rate of accuracy reached 100%; Consider the comprehensive route selection accuracy rate of high resistance earthing fault greater than 95%, wide adaptability.Can be applicable to earth-free; Through grounding through arc with through the high resistance ground system, adapt to the multi-form electric power system of various electric pressures, have the failure wave-recording function; Forever retention fault information can upload to scheduling or control center through multiple stipulations to failure message
Preferably, it is big that the zero-sequence current amplitude becomes, and it changes the amplitude that size equals to be excised the line mutual-ground capacitor electric current.
Preferably; According to the transient state waveform after the fault; Make each feeder line zero sequence and measure the in twos correlation analysis of electric current under certain data window, obtain the feeder line correlation matrix, obtain the integrated correlation coefficient of each bar feeder line and other feeder lines; Through ordering strategy, the final acquisition according to the facies-suite of selecting that the big minispread of earth fault possibility takes place.The route selection accuracy is high, and the route selection result does not receive the influence of system operation mode, topological structure, neutral grounding mode and fault enchancement factor etc., and is insensitive for the scene interference, has stronger robustness.
Preferably, residual voltage appears in system behind the single-phase earthing, confirms in view of the above whether system earth fault takes place, and has fully reliable nargin, adopts the higher zero-sequence current sudden change of sensitivity to measure and starts the route selection element, so that catch transient state process more accurately.
Preferably; Adopt the selection method of singlephase earth fault transient zero-sequence current waveform, according to the zero sequence complementary network, for non-fault line; System's equivalent structure is similar; The correlation analysis method that reflects two signal correction degree is introduced, and through to the comprehensive correlation analysis of transient state identical data window wave shape between each feeder line after the fault, obtains the route selection sequence of arranging according to the ground connection possibility.
Preferably, be provided with current amplification circuit in the line selection apparatus.
Preferably, high performance injection signal generator is set in line selection apparatus.
Useful technique effect of the present invention is:
Adopt the specialized high-speed data acquisition unit, simultaneously sampling; The technical division of labor cooperation; Gather residual voltage, current signal; Utilize threephase current transformer, obtain zero-sequence current; Fault data can store, and is convenient to ex-post analysis; But the fault data teletransmission, but the strange land is analyzed; Utilize transient fault that the line insulation situation is proposed forecast; Line selection apparatus is correctly chosen faulty line once more through drawing the road auxiliary judgement, correctly excises fault, thereby helps to shorten trouble duration, reduces the harm of fault to system; Realize drawing the road assistant criteria through software, failure judgement circuit or busbar grounding accurately improved the accuracy of route selection; The thinking that overlaps a correct isolated fault according to route selection one tripping operation one is handled the small current neutral grounding problem, can reduce the harm to system, improves the stability of system; It is reliable that transient state route selection technology has detection, and success ratio is high, metallic earthing fault rate of accuracy reached 100%; Consider the comprehensive route selection accuracy rate of high resistance earthing fault greater than 95%, wide adaptability.Can be applicable to earth-free; Through grounding through arc with through the high resistance ground system, adapt to the multi-form electric power system of various electric pressures, have the failure wave-recording function; Forever retention fault information can upload to scheduling or control center through multiple stipulations to failure message.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
A kind of low-current ground fault line selection method; It is characterized in that: adopt control computer, low current grounding pick-up unit and zero sequence current mutual inductor is set to constitute line selection apparatus by the outlet way; Characteristic according to the low current neutral grounding electric network single-phase earth fault transient signal; Utilize monitoring fault transient signal, keep watch on the outlet number, carry out low-current ground fault line selection; When distribution network system generation singlephase earth fault; Line selection apparatus adopts residual voltage sudden change variable to start and the comprehensive start-up criterion of residual voltage amplitude; Confirm the fault initial time; Comprehensive start-up criterion is specially the residual voltage last samples value calculating voltage sudden change amount that program monitoring in real time collects, when residual voltage sudden change amount satisfies; If stable permanent singlephase earth fault has taken place in system; And line selection apparatus has excised a non-fault line by error; So whole network shows as residual voltage and still exists and have only a zero-sequence current amplitude in the outlet to change; This circuit is exactly a ground path, and the zero-sequence current amplitude does not all change on all the other circuits, is non-fault line; Set up following route selection criterion: during power distribution network generation single-phase earthing; Residual voltage raises, and adopts residual voltage to start threshold value as entry condition greater than zero sequence, and setting valve is got insulating monitoring voltage; Choose according to system's degree of asymmetry, also can adopt residual voltage sudden change amount as the startup amount; Combine with the route selection technology through the reclosing technology, extinguish ground arc in time, improved power supply reliability; For permanent earth fault,, realize drawing the road assistant criteria through software if falsely drop line; Failure judgement circuit or busbar grounding accurately; Improved the accuracy of route selection, avoided the single-phase earthing overlong time after, develop into the two phase ground short circuit; When low current grounding took place, circuit can move a period of time, but is no more than 2 hours, and the circuit that breaks down needs interruption maintenance; After breaking down, delay time, escape transient earthing fault-time; In line selection apparatus, pass through logic determines, active tripping switch, and then judge whether correct route selection; If falsely drop, realize single shot reclosing, line selection apparatus is correctly chosen faulty line once more through drawing the road auxiliary judgement; Correct excision fault is handled the small current neutral grounding problem according to the thinking of route selection, tripping operation, the correct isolated fault of coincidence, thereby accomplishes earth fault line selection.
Its characteristic is that also the zero-sequence current amplitude becomes big, and it changes the amplitude that size equals to be excised the line mutual-ground capacitor electric current.
Its characteristic also is according to the transient state waveform after the fault; Make each feeder line zero sequence and measure the in twos correlation analysis of electric current under certain data window; Obtain the feeder line correlation matrix; Obtain the integrated correlation coefficient of each bar feeder line and other feeder lines, through ordering strategy, the final acquisition according to the facies-suite of selecting that the big minispread of earth fault possibility takes place.
Residual voltage appearred in system after its characteristic also was single-phase earthing, confirmed in view of the above whether system earth fault takes place, and had fully reliable nargin, adopted the higher zero-sequence current sudden change of sensitivity to measure and started the route selection element, so that catch transient state process more accurately.
Its characteristic also is to adopt the selection method of singlephase earth fault transient zero-sequence current waveform; According to the zero sequence complementary network; For non-fault line, system's equivalent structure is similar, reflects that the correlation analysis method of two signal correction degree is introduced; Through to the comprehensive correlation analysis of transient state identical data window wave shape between each feeder line after the fault, obtain the route selection sequence of arranging according to the ground connection possibility.
Its characteristic also is to be provided with in the line selection apparatus current amplification circuit.
Its characteristic also is in line selection apparatus, to be provided with high performance injection signal generator.
Can adopt two kinds of schemes: the distributed and centralized next concrete route selection function that realizes, for centralized solution, the route selection function is realized by isolated system; Analyze consistent in performance and the literary composition; But this mode is owing to assembled the electric current of all feeder lines, and on-the-spot required cable is more, and relative cost is higher.And distributed implementation is that the route selection function is blended in the present electric substation automation system, and the route selection function is realized by the route selection software package that places the background monitoring platform, and data acquisition is realized by each function on the feeder line at interval.Under this pattern; Will be referred to data synchronization problems; Comprise two aspects, the one, data window is synchronous, to this can with the data acquisition starting element adjust very sensitive; Guarantee under the harshest fault mode, to have enough sensitivity, determine whether to collect each feeder line sampled data by route selection program in the backstage according to residual voltage again and solve with startup route selection function; The 2nd, that samples is synchronous, and maximum error is to differ a SI, and this emulation and actual device test are shown, though influence the size of related coefficient, does not influence final route selection result's accuracy.
The above is merely the preferred embodiments of the present invention; Be not so limit claim of the present invention; Every equivalent structure transformation that utilizes description of the present invention to do, or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (7)
1. low-current ground fault line selection method; It is characterized in that: adopt control computer, low current grounding pick-up unit and zero sequence current mutual inductor is set to constitute line selection apparatus by the outlet way; Characteristic according to the low current neutral grounding electric network single-phase earth fault transient signal; Utilize monitoring fault transient signal, keep watch on the outlet number, carry out low-current ground fault line selection; When distribution network system generation singlephase earth fault; Line selection apparatus adopts residual voltage sudden change variable to start and the comprehensive start-up criterion of residual voltage amplitude; Confirm the fault initial time; Comprehensive start-up criterion is specially the residual voltage last samples value calculating voltage sudden change amount that program monitoring in real time collects, when residual voltage sudden change amount satisfies; If stable permanent singlephase earth fault has taken place in system; And line selection apparatus has excised a non-fault line by error; So whole network shows as residual voltage and still exists and have only a zero-sequence current amplitude in the outlet to change; This circuit is exactly a ground path, and the zero-sequence current amplitude does not all change on all the other circuits, is non-fault line; Set up following route selection criterion: during power distribution network generation single-phase earthing; Residual voltage raises, and adopts residual voltage to start threshold value as entry condition greater than zero sequence, and setting valve is got insulating monitoring voltage; Choose according to system's degree of asymmetry, perhaps adopt residual voltage sudden change amount as the startup amount; Combine with the route selection technology through the reclosing technology, extinguish ground arc in time, improved power supply reliability; For permanent earth fault,, realize drawing the road assistant criteria through software if falsely drop line; Failure judgement circuit or busbar grounding accurately; Improved the accuracy of route selection, avoided the single-phase earthing overlong time after, develop into the two phase ground short circuit; When low current grounding took place, circuit can move a period of time, but is no more than 2 hours, and the circuit that breaks down needs interruption maintenance; After breaking down, delay time, escape transient earthing fault-time; In line selection apparatus, pass through logic determines, active tripping switch, and then judge whether correct route selection; If falsely drop, realize single shot reclosing, line selection apparatus is correctly chosen faulty line once more through drawing the road auxiliary judgement; Correct excision fault is handled the small current neutral grounding problem according to the thinking of route selection, tripping operation, the correct isolated fault of coincidence, thereby accomplishes earth fault line selection.
2. a kind of low-current ground fault line selection method according to claim 1 is characterized in that: the zero-sequence current amplitude becomes big, and it changes the amplitude that size equals to be excised the line mutual-ground capacitor electric current.
3. a kind of low-current ground fault line selection method according to claim 1; It is characterized in that: according to the transient state waveform after the fault; Make each feeder line zero sequence and measure the in twos correlation analysis of electric current under certain data window, obtain the feeder line correlation matrix, obtain the integrated correlation coefficient of each bar feeder line and other feeder lines; Through ordering strategy, the final acquisition according to the facies-suite of selecting that the big minispread of earth fault possibility takes place.
4. a kind of low-current ground fault line selection method according to claim 1; It is characterized in that: residual voltage appears in system behind the single-phase earthing; Confirm in view of the above whether system earth fault takes place; Have fully reliable nargin, adopt the higher zero-sequence current sudden change of sensitivity to measure and start the route selection element, so that catch transient state process more accurately.
5. a kind of low-current ground fault line selection method according to claim 1; It is characterized in that: adopt the selection method of singlephase earth fault transient zero-sequence current waveform, according to the zero sequence complementary network, for non-fault line; System's equivalent structure is similar; The correlation analysis method that reflects two signal correction degree is introduced, and through to the comprehensive correlation analysis of transient state identical data window wave shape between each feeder line after the fault, obtains the route selection sequence of arranging according to the ground connection possibility.
6. a kind of low-current ground fault line selection method according to claim 1 is characterized in that: be provided with current amplification circuit in the line selection apparatus.
7. a kind of low-current ground fault line selection method according to claim 1 is characterized in that: high performance injection signal generator is set in line selection apparatus.
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| CN103018631A (en) * | 2012-12-04 | 2013-04-03 | 保定供电公司 | System for 10kV fault line detection |
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| CN103267928A (en) * | 2013-04-27 | 2013-08-28 | 王鹏 | Low-current system single-phase earth fault line selection control circuit |
| CN103353573A (en) * | 2013-06-18 | 2013-10-16 | 国家电网公司 | Rapid test stopping method of power grid grounding fault |
| CN103424668A (en) * | 2013-08-05 | 2013-12-04 | 昆明理工大学 | Arc light ground fault continuous route selection method utilizing principal component analysis of zero-sequence current of feeder line and evidence theoretical integration |
| CN103439634A (en) * | 2013-09-02 | 2013-12-11 | 北京四方继保自动化股份有限公司 | Method for fault line selection by means of transient state polarity characteristics of zero-sequence current at grounding moment |
| CN103487724A (en) * | 2013-09-12 | 2014-01-01 | 国家电网公司 | Single-phase ground fault positioning method of power distribution network |
| CN103675605A (en) * | 2013-12-11 | 2014-03-26 | 湖南大学 | Small-current earth fault line selection method based on fault signal transient state correlation analysis |
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| CN106602527A (en) * | 2016-12-05 | 2017-04-26 | 山东科汇电力自动化股份有限公司 | Line selection device and protection non-fault-trip prevention cooperation small current grounding fault processing method |
| CN107102236A (en) * | 2017-03-24 | 2017-08-29 | 国网浙江余姚市供电公司 | A kind of fault line selection method for single-phase-to-ground fault based on waveform correlation analysis after failure |
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| CN103207354A (en) * | 2013-03-13 | 2013-07-17 | 福建省电力有限公司 | Maximum line selection coefficient principle based single-phase earth fault line selection method for power distribution network |
| CN103207354B (en) * | 2013-03-13 | 2015-07-01 | 福建省电力有限公司 | Maximum line selection coefficient principle based single-phase earth fault line selection method for power distribution network |
| CN103267928B (en) * | 2013-04-27 | 2015-04-22 | 王鹏 | Low-current system single-phase earth fault line selection control circuit |
| CN103267928A (en) * | 2013-04-27 | 2013-08-28 | 王鹏 | Low-current system single-phase earth fault line selection control circuit |
| CN103353573A (en) * | 2013-06-18 | 2013-10-16 | 国家电网公司 | Rapid test stopping method of power grid grounding fault |
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