CN104730422A - Power distribution network single-phase earth fault positioning device and method - Google Patents
Power distribution network single-phase earth fault positioning device and method Download PDFInfo
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- CN104730422A CN104730422A CN201510146674.7A CN201510146674A CN104730422A CN 104730422 A CN104730422 A CN 104730422A CN 201510146674 A CN201510146674 A CN 201510146674A CN 104730422 A CN104730422 A CN 104730422A
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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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- 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 provides a power distribution network single-phase earth fault positioning device and method. The power distribution network single-phase earth fault positioning device is installed on transformer substations arranged at two ends of a detected circuit, a single-phase earth fault is positioned by the adoption of a traveling wave method, and double end positioning is conducted by the adoption of a fault traveling wave and with the help of a GPS; the fault positioning device is composed of a traveling wave sensor, a GPS sampling unit, a central processing unit and a fault positioning host. By the adoption of the fault positioning device and method, the precision of fault positioning is improved, the line patrol difficulty is lowered, so that the power network stabilization and safe operation are guaranteed.
Description
Technical field
The present invention relates to a kind of distribution network failure field of locating technology, specifically, is a kind of single-phase earth fault positioning device for electrical power distribution network and method.
Background technology
Along with China's industrial expansion, electric power networks scale strengthens gradually, and network structure is complicated gradually, and user is also more and more higher to the requirement that power supply is stable.On the one hand, the generation of fault will be prevented when system is normally run; On the other hand, after fault occurs, carry out localization of fault as early as possible, fix a breakdown rapidly, ensure system cloud gray model safety, by minimization of loss.
Present stage, China's power distribution network great majority adopted system with non-effectively earthed neutral (isolated neutral or through grounding through arc), short-circuit loop can not be formed when being characterized in singlephase earth fault, it is all non-fault line capacitive earth current sums that faulty line flows through electric current, numerical value is little, need not line disconnection at once, allow a period of time that operates with failure. but increasing along with feeder line, capacitance current increases, long-play just easy single-phase earthing becomes multipoint earthing short circuit, arc grounding also can cause the superpotential of system, damage equipment, the safe operation of destruction system, so faulty line and the position of fault must be found in time.
But distribution network failure location is a difficult problem urgently to be resolved hurrily in electric system always.This is determined by the feature of distribution network self.Distribution network has following three large features compared with power transmission network:
(1) radius of electricity supply is little.Shorter circuit makes widely used classical impedance method in power transmission network localization of fault obviously strengthen at distribution network medial error.
(2) end random load is many.This feature makes impedance method cannot accurately locate in power distribution network.
(3) lines branch is many.From a structural point, many accurately certain branches that gives of branch itself bring difficulty; From algorithm, branch's brought information just many more, and the true and false information wherein comprised is all many, mixed in together, is difficult to put in order.
Thus, distribution network failure orientation problem is never effectively solved. the domestic method mostly still adopting artificial line walking, because distribution network branch is complicated, a large amount of line walking workman can not be sent again simultaneously, so power off time is longer after fault generation, automatization level is low.If a kind of suitable technical method can be found, after fault occurs, abort situation can be made accurately rapidly, save manpower and materials on the one hand, also improve the long-time stability of system cloud gray model on the other hand.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of single-phase earth fault positioning device for electrical power distribution network and method, it adopts traveling wave method to position one-phase earthing failure in electric distribution network, utilizes fault traveling wave and carries out both-end location by GPS.
Whole system comprises the two cover Location Equipment for Travel Waves being installed on detected circuit two ends transformer station, and Location Equipment for Travel Wave is made up of traveling wave sensor, GPS sampling unit, CPU (central processing unit) and localization of fault main frame four part.Traveling wave sensor is socketed on the CVT ground wire at circuit two ends.
Along with the development of communication technology of satellite, satellite time transfer method turns to civilian from military, and the synchronous sampling method at present based on GPS (GPS) is used widely in electric system.Current adoptable synchronous satellite system mainly contains three kinds, is respectively: the Beidou satellite system of GOES system (Geostationary Operational Environmental Satellite), gps satellite system and China's independent development.
GPS amounts to 3 part formations primarily of space segment, ground control system and subscriber equipment.
Ultimate principle is: the distance between the satellite first measuring known location to receiver user, then the time that each satellite-signal arrives receiver is obtained, last COMPREHENSIVE CALCULATING just can determine receiver position, as long as and had position coordinates just can ensure the accuracy of this location point time.
The capable ripple sampling unit of GPS comprises travelling wave signal processing module and GPS timing module.
Travelling wave signal processing module detects wavefront, identification wavefront; The arrival that GPS timing module is wavefront provides correct time.
Travelling wave signal processing module is made up of polarity of traveling wave testing circuit and wavefront abrupt climatic change circuit, and the amplitude of employing row ripple realizes wavefront and polarity detects.
Negative row ripple is changed to positive row ripple by full-wave rectifying circuit, if the wavefront having amplitude to be greater than setting value occurs.Then be defined as fault traveling wave, second electrical level comparer exports wavefront jump signal; Comparatively, if just row wave amplitude is greater than setting value, then output detections polarity of traveling wave signal, to the not polarization signal output of negative row ripple for first level comparator and positive traveling-wave ratio.In order to the shock wave frequent starting GPS sampling unit preventing electromagnetic interference (EMI) etc. from not causing line fault, should according to the feature adjustment setting amplitude level value of line fault row ripple.
GPS timing module adopts counter and comparer to carry out frequency division to High Precision Crystal Oscillator, produces crystal oscillator clock signal second, and is revised fiducial value by CPU, produces clock revised second.Revised second, clock triggered the due in of the first latches GPS pulse per second (PPS), obtained clock and the phase differential of GPS pulse per second (PPS) revised second.By the modified value analysis to this phase differential and fiducial value, produce the biased sequence of GPS clock second and crystal oscillator clock second.This deviation comprises the Random Drift Error of gps clock and the cumulative errors of crystal oscillator; Adopt One-place 2-th Order regression analysis model to estimate two kinds of errors, isolate respective error; And crystal oscillator cumulative errors are revised, construct high precision clock generating means.Once, GPS clocking error second measured by first n time and the front fiducial value historical data arranged for n time calculate this fiducial value that will arrange in fiducial value setting per second.
When wavefront arrives, the wavefront jump signal of generation is sent into the second latch, latch the time value in GPS synchronous this moment of high precision time service clock, start CPU and the second latch data is read in calculator memory, the initial moment arrive wavefront and the polarity of wavefront carry out fast recording.
GPS after receiving clock signal by antenna first through pre-filtering, amplifying circuit carry out anti-interference after be used again.Pre-filtering makes GPS not be subject to relative to the outer superpower interference of the band of two wave band frequency bands of GPS, adopt the passive filter with steep cutoff frequency characteristic to suppress large out-of-band power, have lower insertion loss and good cut off band width noiseproof feature.During gps signal arrival receiver, signal is very little, therefore needs to use amplifying circuit to increase its amplitude, and uses limiter to eliminate impulse disturbances, adopts diode to be placed in prime amplifier and disturbs from any form highpowerpulse to protect it.Limiter on normal signal or most Radio Frequency Interfere without impact, high power signals of just pruning.
CPU (central processing unit) has power supply unit, RS485 change-over circuit, light-coupled isolation unit, switch value input interface, CPU element, network interface card, RS485 communication pilot lamp and network interface card communication pilot lamp, wherein RS485 change-over circuit is connected with GPS sampling unit, and be connected with CPU element by light-coupled isolation unit, switch value input interface receiving key amount input signal, CPU element connects localization of fault main frame by network interface card.
Power supply unit adopts solar cell and accumulator to carry out the mode of hybrid power supply as its main power supply method of supplying, when choosing accumulator, also should select rechargeable battery and the accumulator of different kinds according to the size of solar cell power.When a commutation diode of will connecting in circuit prevents solar cell from falling under voltage or not generating electricity, accumulator is to solar cell inverse put electricity, simultaneously, for preventing solar cell impaired owing to blocking under high light, a preferably bypass diode in parallel at the two poles of the earth of solar module output terminal, prevent certain block electric battery from becoming load can not get illumination and produce serious heating, the current value of bypass diode can not lower than the current value of this block solar components.
Traveling wave method positions method to one-phase earthing failure in electric distribution network:
When circuit is Single Medium, row ripple velocity of propagation is on the line constant, and velocity of wave v represents.When in circuit MN, certain 1 F breaks down, the row wave direction circuit two ends that trouble spot produces are propagated.The moment that row ripple arrives two ends is respectively t1 and t2.Then can obtain following equations group:
Wherein L is the length of circuit MN,
it is the mistiming that fault traveling wave arrives M end and N end.L and
by finding in reality or recording, known conditions can be can be considered.Therefore, can be obtained by formula (1):
Wherein
the distance that M end is arrived in trouble spot,
it is the distance that N end is arrived in trouble spot.
For the joint line be made up of pole line and cable, due to the propagation speed of row ripple on pole line and cable
Degree differs greatly, and said method lost efficacy.But the time that fault traveling wave arrives circuit two ends still meets following system of equations:
Wherein
be the mistiming that fault traveling wave arrives M end and N end, t is that row ripple passes to the time required for N end from M section,
can record with t, be considered as known conditions, therefore, can be obtained by formula (3)
Wherein
that row ripple passes to the time required for M end by trouble spot,
that row ripple passes to the time required for N end by trouble spot.
Based on the fault search algorithm of time variable
The velocity of wave of row ripple is relevant with the medium of circuit, velocity of wave substantially constant in the circuit that electric parameter is single.In a built on stilts cable hybrid line, as long as know the concrete structure of circuit, and the velocity of wave of row ripple in pole line and cable, just can calculate trip ripple and propagate the required time at every section of circuit and in whole piece circuit; Namely the concrete structure of known one section of built on stilts cable hybrid line and row ripple move to the time circuit needed for certain point from circuit one end, just can determine the position of this point.Based on above-mentioned principle, propose the fault search algorithm based on time variable, this algorithm solves the discontinuous problem of velocity of wave in mixed line fault location.Pole line and cable line are uniform dielectric circuit, and row ripple velocity of propagation is wherein respectively
with
.
Algorithm steps is as follows:
(1) structure of circuit MN is determined, the length of every section of circuit and the velocity of propagation of row ripple in different circuit.Because traveling wave speed is relevant with the actual parameter of circuit, and the parameter of circuit is with frequency change.Therefore, accurate traveling wave speed to be obtained in reality to need to carry out on-line measurement.
(2) travel-time of row ripple on every section of circuit is calculated according to the length of every section of circuit and the velocity of propagation of row ripple on every section of circuit.The time that MA, AB, BC, CD, DN section circuit is corresponding is designated as respectively
.
(3) by circuit two ends signal supervisory instrument respectively the capable ripple of record trouble arrive the moment at circuit two ends first, and then try to achieve the mistiming of fault traveling wave to circuit two ends.To upload at whole piece circuit according to row ripple again and broadcast the required time and can obtain fault traveling wave by formula (4) and arrive time at circuit two ends.
(4) time of fault traveling wave arrival circuit M end is designated as
, search from M end, by
>
can failure judgement point after MA section circuit; By
can failure judgement point on AB section circuit; AB section circuit is pole line, can obtain trouble spot to the distance of A point to be
, and then obtain the distance of holding to M trouble spot and be
.
The present invention, by the characteristic analysis to distribution line, proposes one-phase earthing failure in electric distribution network localization method, improves the degree of accuracy of localization of fault, reduce line walking difficulty, thus ensure that the operation of the stabilization of power grids and safety.
Accompanying drawing explanation
Fig. 1 is single-phase earth fault positioning device for electrical power distribution network structure of the present invention
Fig. 2 is the central processing unit structure of single-phase earth fault positioning device for electrical power distribution network of the present invention
Fig. 3 is the artificial circuit of one-phase earthing failure in electric distribution network localization method of the present invention.
Embodiment
The invention provides a kind of single-phase earth fault positioning device for electrical power distribution network and method, it adopts traveling wave method to position one-phase earthing failure in electric distribution network, utilizes fault traveling wave and carries out both-end location by GPS.
As shown in Figure 1, whole system comprises the two cover Location Equipment for Travel Waves being installed on detected circuit two ends transformer station, and Location Equipment for Travel Wave is made up of traveling wave sensor, GPS sampling unit, CPU (central processing unit) and localization of fault main frame four part.Traveling wave sensor is socketed on the CVT ground wire at circuit two ends.
Along with the development of communication technology of satellite, satellite time transfer method turns to civilian from military, and the synchronous sampling method at present based on GPS (GPS) is used widely in electric system.Current adoptable synchronous satellite system mainly contains three kinds, is respectively: the Beidou satellite system of GOES system (Geostationary Operational Environmental Satellite), gps satellite system and China's independent development.
GPS amounts to 3 part formations primarily of space segment, ground control system and subscriber equipment.
Ultimate principle is: the distance between the satellite first measuring known location to receiver user, then the time that each satellite-signal arrives receiver is obtained, last COMPREHENSIVE CALCULATING just can determine receiver position, as long as and had position coordinates just can ensure the accuracy of this location point time.
The capable ripple sampling unit of GPS comprises travelling wave signal processing module and GPS timing module.
Travelling wave signal processing module detects wavefront, identification wavefront; The arrival that GPS timing module is wavefront provides correct time.
Travelling wave signal processing module is made up of polarity of traveling wave testing circuit and wavefront abrupt climatic change circuit, and the amplitude of employing row ripple realizes wavefront and polarity detects.
Negative row ripple is changed to positive row ripple by full-wave rectifying circuit, if the wavefront having amplitude to be greater than setting value occurs.Then be defined as fault traveling wave, second electrical level comparer exports wavefront jump signal; Comparatively, if just row wave amplitude is greater than setting value, then output detections polarity of traveling wave signal, to the not polarization signal output of negative row ripple for first level comparator and positive traveling-wave ratio.In order to the shock wave frequent starting GPS sampling unit preventing electromagnetic interference (EMI) etc. from not causing line fault, should according to the feature adjustment setting amplitude level value of line fault row ripple.
GPS timing module adopts counter and comparer to carry out frequency division to High Precision Crystal Oscillator, produces crystal oscillator clock signal second, and is revised fiducial value by CPU, produces clock revised second.Revised second, clock triggered the due in of the first latches GPS pulse per second (PPS), obtained clock and the phase differential of GPS pulse per second (PPS) revised second.By the modified value analysis to this phase differential and fiducial value, produce the biased sequence of GPS clock second and crystal oscillator clock second.This deviation comprises the Random Drift Error of gps clock and the cumulative errors of crystal oscillator; Adopt One-place 2-th Order regression analysis model to estimate two kinds of errors, isolate respective error; And crystal oscillator cumulative errors are revised, construct high precision clock generating means.Once, GPS clocking error second measured by first n time and the front fiducial value historical data arranged for n time calculate this fiducial value that will arrange in fiducial value setting per second.
When wavefront arrives, the wavefront jump signal of middle generation is sent into the second latch, latch the time value in GPS synchronous this moment of high precision time service clock, start CPU and the second latch data is read in calculator memory, the initial moment arrive wavefront and the polarity of wavefront carry out fast recording.
GPS after receiving clock signal by antenna first through pre-filtering, amplifying circuit carry out anti-interference after be used again.Pre-filtering makes GPS not be subject to relative to the outer superpower interference of the band of two wave band frequency bands of GPS, adopt the passive filter with steep cutoff frequency characteristic to suppress large out-of-band power, have lower insertion loss and good cut off band width noiseproof feature.During gps signal arrival receiver, signal is very little, therefore needs to use amplifying circuit to increase its amplitude, and uses limiter to eliminate impulse disturbances, adopts diode to be placed in prime amplifier and disturbs from any form highpowerpulse to protect it.Limiter on normal signal or most Radio Frequency Interfere without impact, high power signals of just pruning.
As shown in Figure 2, CPU (central processing unit) has power supply unit, RS485 change-over circuit, light-coupled isolation unit, switch value input interface, CPU element, network interface card, RS485 communication pilot lamp and network interface card communication pilot lamp, wherein RS485 change-over circuit is connected with GPS sampling unit, and be connected with CPU element by light-coupled isolation unit, switch value input interface receiving key amount input signal, CPU element connects localization of fault main frame by network interface card.
Power supply unit adopts solar cell and accumulator to carry out the mode of hybrid power supply as its main power supply method of supplying, when choosing accumulator, also should select rechargeable battery and the accumulator of different kinds according to the size of solar cell power.When a commutation diode of will connecting in circuit prevents solar cell from falling under voltage or not generating electricity, accumulator is to solar cell inverse put electricity, simultaneously, for preventing solar cell impaired owing to blocking under high light, a preferably bypass diode in parallel at the two poles of the earth of solar module output terminal, prevent certain block electric battery from becoming load can not get illumination and produce serious heating, the current value of bypass diode can not lower than the current value of this block solar components.
Traveling wave method positions method to one-phase earthing failure in electric distribution network
When circuit is Single Medium, row ripple velocity of propagation is on the line constant, and velocity of wave v represents.When in circuit MN, certain 1 F breaks down, the row wave direction circuit two ends that trouble spot produces are propagated.The moment that row ripple arrives two ends is respectively t1 and t2.Then can obtain following equations group:
Wherein L is the length of circuit MN,
it is the mistiming that fault traveling wave arrives M end and N end.L and
by finding in reality or recording, known conditions can be can be considered.Therefore, can be obtained by formula (1):
Wherein
the distance that M end is arrived in trouble spot,
it is the distance that N end is arrived in trouble spot.
For the joint line be made up of pole line and cable, due to the propagation speed of row ripple on pole line and cable
Degree differs greatly, and said method lost efficacy.But the time that fault traveling wave arrives circuit two ends still meets following system of equations:
Wherein
be the mistiming that fault traveling wave arrives M end and N end, t is that row ripple passes to the time required for N end from M section,
can record with t, be considered as known conditions, therefore, can be obtained by formula (3)
Wherein
that row ripple passes to the time required for M end by trouble spot,
that row ripple passes to the time required for N end by trouble spot.
Based on the fault search algorithm of time variable
The velocity of wave of row ripple is relevant with the medium of circuit, velocity of wave substantially constant in the circuit that electric parameter is single.In a built on stilts cable hybrid line, as long as know the concrete structure of circuit, and the velocity of wave of row ripple in pole line and cable, just can calculate trip ripple and propagate the required time at every section of circuit and in whole piece circuit; Namely the concrete structure of known one section of built on stilts cable hybrid line and row ripple move to the time circuit needed for certain point from circuit one end, just can determine the position of this point.Based on above-mentioned principle, propose the fault search algorithm based on time variable, this algorithm solves the discontinuous problem of velocity of wave in mixed line fault location.Pole line and cable line are uniform dielectric circuit, and row ripple velocity of propagation is wherein respectively
with
.
As shown in Figure 3, algorithm steps is as follows:
(1) structure of circuit MN is determined, the length of every section of circuit and the velocity of propagation of row ripple in different circuit.Because traveling wave speed is relevant with the actual parameter of circuit, and the parameter of circuit is with frequency change.Therefore, accurate traveling wave speed to be obtained in reality to need to carry out on-line measurement.
(2) travel-time of row ripple on every section of circuit is calculated according to the length of every section of circuit and the velocity of propagation of row ripple on every section of circuit.The time that MA, AB, BC, CD, DN section circuit is corresponding is designated as respectively
.
(3) by circuit two ends signal supervisory instrument respectively the capable ripple of record trouble arrive the moment at circuit two ends first, and then try to achieve the mistiming of fault traveling wave to circuit two ends.To upload at whole piece circuit according to row ripple again and broadcast the required time and can obtain fault traveling wave by formula (4) and arrive time at circuit two ends.
(4) time of fault traveling wave arrival circuit M end is designated as
, search from M end, by
>
can failure judgement point after MA section circuit; By
can failure judgement point on AB section circuit; AB section circuit is pole line, can obtain trouble spot to the distance of A point to be
, and then obtain the distance of holding to M trouble spot and be
.
The present invention, by the characteristic analysis to distribution line, proposes one-phase earthing failure in electric distribution network localization method, improves the degree of accuracy of localization of fault, reduce line walking difficulty, thus ensure that the operation of the stabilization of power grids and safety.
The foregoing is only of the present invention and be preferably not limited to the present invention, obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (6)
1. a single-phase earth fault positioning device for electrical power distribution network, it is characterized in that, described fault locator is installed on detected circuit two ends transformer station, traveling wave method is adopted to position one-phase earthing failure in electric distribution network, utilize fault traveling wave and carry out both-end location by GPS, described fault locator is made up of traveling wave sensor, GPS sampling unit, CPU (central processing unit) and localization of fault main frame four part, and traveling wave sensor is socketed on the CVT ground wire at circuit two ends.
2. a kind of single-phase earth fault positioning device for electrical power distribution network as claimed in claim 1, is characterized in that, the capable ripple sampling unit of described GPS comprises travelling wave signal processing module and GPS timing module,
Travelling wave signal processing module detects wavefront, identification wavefront; The arrival that GPS timing module is wavefront provides correct time,
Travelling wave signal processing module is made up of polarity of traveling wave testing circuit and wavefront abrupt climatic change circuit, and the amplitude of employing row ripple realizes wavefront and polarity detects,
Negative row ripple is changed to positive row ripple by full-wave rectifying circuit, if the wavefront having amplitude to be greater than setting value occurs, be then defined as fault traveling wave, second electrical level comparer exports wavefront jump signal; Comparatively, if just row wave amplitude is greater than setting value, then output detections polarity of traveling wave signal, to the not polarization signal output of negative row ripple for first level comparator and positive traveling-wave ratio.
3. a kind of single-phase earth fault positioning device for electrical power distribution network as claimed in claim 2, it is characterized in that, GPS timing module adopts counter and comparer to carry out frequency division to High Precision Crystal Oscillator, produce crystal oscillator clock signal second, and by CPU, fiducial value is revised, produce clock revised second, revised second, clock triggered the due in of the first latches GPS pulse per second (PPS), obtain clock and the phase differential of GPS pulse per second (PPS) revised second, by the modified value analysis to this phase differential and fiducial value, produce the biased sequence of GPS clock second and crystal oscillator clock second, deviation comprises the Random Drift Error of gps clock and the cumulative errors of crystal oscillator, adopt One-place 2-th Order regression analysis model to estimate two kinds of errors, isolate respective error, and crystal oscillator cumulative errors are revised, construct high precision clock generating means, once, GPS clocking error second measured by first n time and the front fiducial value historical data arranged for n time calculate this fiducial value that will arrange in fiducial value setting per second,
When wavefront arrives, the wavefront jump signal of generation is sent into the second latch, latch the time value in GPS synchronous this moment of high precision time service clock, start CPU and the second latch data is read in calculator memory, the initial moment arrive wavefront and the polarity of wavefront carry out fast recording
GPS after receiving clock signal by antenna first through pre-filtering, amplifying circuit carry out anti-interference after be used again, pre-filtering adopts the passive filter with steep cutoff frequency characteristic, amplifying circuit is used to increase gps signal amplitude, use limiter to eliminate impulse disturbances, and diode is placed in prime amplifier.
4. a kind of single-phase earth fault positioning device for electrical power distribution network as claimed in claim 3, it is characterized in that, CPU (central processing unit) has power supply unit, RS485 change-over circuit, light-coupled isolation unit, switch value input interface, CPU element, network interface card, RS485 communication pilot lamp and network interface card communication pilot lamp, wherein RS485 change-over circuit is connected with GPS sampling unit, and be connected with CPU element by light-coupled isolation unit, switch value input interface receiving key amount input signal, CPU element connects localization of fault main frame by network interface card
Power supply unit adopts solar cell and accumulator to carry out the mode of hybrid power supply as its main power supply method of supplying, size according to solar cell power selects accumulator, when series rectifier diode prevents solar cell from falling under voltage or not generating electricity, accumulator is to solar cell inverse put electricity, a bypass diode in parallel at the two poles of the earth of solar module output terminal, prevents certain block electric battery from becoming load can not get illumination and produces serious heating.
5. the Fault Locating Method of the single-phase earth fault positioning device for electrical power distribution network according to any one of claim 1-4, it is characterized in that, described Fault Locating Method is: when circuit is Single Medium, row ripple velocity of propagation is on the line constant, velocity of wave v represents, when in circuit MN, certain 1 F breaks down, the row wave direction circuit two ends that trouble spot produces are propagated, the moment that row ripple arrives two ends is respectively t1 and t2, then can obtain following equations group:
Wherein L is the length of circuit MN,
be fault traveling wave arrive M end and N end mistiming, L with
can find or record, therefore, can be obtained by formula (1):
Wherein
the distance that M end is arrived in trouble spot,
the distance that N end is arrived in trouble spot,
For the joint line be made up of pole line and cable, because the velocity of propagation of row ripple on pole line and cable differs greatly, said method lost efficacy, but the time that fault traveling wave arrives circuit two ends still meets following system of equations:
Wherein
be the mistiming that fault traveling wave arrives M end and N end, t is that row ripple passes to the time required for N end from M section,
can record with t, therefore, can be obtained by formula (3)
Wherein
that row ripple passes to the time required for M end by trouble spot,
that row ripple passes to the time required for N end by trouble spot.
6. Fault Locating Method as claimed in claim 5, it is characterized in that, pole line and cable line are uniform dielectric circuit, and row ripple velocity of propagation is wherein respectively
with
, algorithm steps is:
(1) structure of circuit MN is determined, the length of every section of circuit and the velocity of propagation of row ripple in different circuit,
(2) calculate the travel-time of row ripple on every section of circuit according to the length of every section of circuit and the velocity of propagation of row ripple on every section of circuit, the time that MA, AB, BC, CD, DN section circuit is corresponding is designated as respectively
,
(3) by circuit two ends signal supervisory instrument respectively the capable ripple of record trouble arrive the moment at circuit two ends first, and then try to achieve the mistiming of fault traveling wave to circuit two ends, to upload at whole piece circuit according to row ripple again and broadcast the required time and can obtain fault traveling wave by formula (4) and arrive time at circuit two ends
(4) time of fault traveling wave arrival circuit M end is designated as
, search from M end, by
>
can failure judgement point after MA section circuit; By
can failure judgement point on AB section circuit; AB section circuit is pole line, can obtain trouble spot to the distance of A point to be
, and then obtain the distance of holding to M trouble spot and be
.
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| CN201510146674.7A CN104730422A (en) | 2015-03-31 | 2015-03-31 | Power distribution network single-phase earth fault positioning device and method |
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| CN106291241A (en) * | 2016-08-11 | 2017-01-04 | 国网天津市电力公司 | A kind of electric power cable intelligent fault warning system |
| CN106291230A (en) * | 2016-07-24 | 2017-01-04 | 徐荣婷 | A kind of Multifunctional power cable fault location on-line monitoring system |
| CN106526421A (en) * | 2016-11-09 | 2017-03-22 | 中国南方电网有限责任公司 | Method for adding current traveling wave signal acquisition to transmission line matching device |
| TWI599782B (en) * | 2017-02-14 | 2017-09-21 | 徐政村 | Apparatus for detecting quality of indoor power distribution line |
| CN108152661A (en) * | 2017-11-15 | 2018-06-12 | 贵州电网有限责任公司 | Looped network cable initial failure early warning and alignment system and method based on transient disturbance |
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| CN108152661A (en) * | 2017-11-15 | 2018-06-12 | 贵州电网有限责任公司 | Looped network cable initial failure early warning and alignment system and method based on transient disturbance |
| WO2020207066A1 (en) * | 2019-04-09 | 2020-10-15 | 平高集团有限公司 | Fault indicator device and system, and power distribution network system |
| CN110658420A (en) * | 2019-11-01 | 2020-01-07 | 国网江苏省电力有限公司徐州供电分公司 | Double-end traveling wave fault location method for hybrid power transmission line based on wavelet transformation and time search strategy |
| CN110658420B (en) * | 2019-11-01 | 2020-11-24 | 国网江苏省电力有限公司徐州供电分公司 | Double-end traveling wave fault location method for hybrid power transmission line |
| CN110954781A (en) * | 2019-12-10 | 2020-04-03 | 广西电网有限责任公司河池供电局 | Double-end traveling wave fault positioning method and system based on transient current of ground potential end |
| CN111983374A (en) * | 2020-06-05 | 2020-11-24 | 国网山东省电力公司东营市垦利区供电公司 | Power distribution network fault positioning device and positioning method thereof |
| CN111624442A (en) * | 2020-06-10 | 2020-09-04 | 广东电网有限责任公司电力科学研究院 | Power distribution network fault traveling wave positioning device and method |
| CN117929928A (en) * | 2024-03-21 | 2024-04-26 | 高唐县恒诚建筑工程有限公司 | Circuit updating and fault detection method, system and medium based on Internet of things |
| CN117929928B (en) * | 2024-03-21 | 2024-06-07 | 高唐县恒诚建筑工程有限公司 | Circuit updating and fault detection method, system and medium based on Internet of things |
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