CN103884959A - Power supply line fault locating instrument and fault locating method - Google Patents
Power supply line fault locating instrument and fault locating method Download PDFInfo
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- CN103884959A CN103884959A CN201310750892.2A CN201310750892A CN103884959A CN 103884959 A CN103884959 A CN 103884959A CN 201310750892 A CN201310750892 A CN 201310750892A CN 103884959 A CN103884959 A CN 103884959A
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Abstract
The invention discloses a power supply line fault locating instrument and fault locating method. The locating instrument comprises an electronic PT acquisition unit, a power supply module, a time synchronization circuit, a satellite signal receiver, a satellite antenna, a CT acquisition unit, a high-resistance-to-low-resistance channel, a high-speed acquisition AD conversion unit, a CPU processor, a display screen, a GPRS module and a 3G antenna. The satellite signal receiver is connected with the time synchronization circuit which is connected with the CPU processor. The electronic PT acquisition unit is connected with the high-resistance-to-low-resistance channel which is connected with the high-speed acquisition AD conversion unit. The CT acquisition unit is connected with the high-speed acquisition AD conversion unit which is connected with the CPU processor. Accurate transmission change of high-frequency voltage traveling waves can be realized, and accurate locating and distance measurement of faults of overhead lines and underground cables can be realized.
Description
Technical field
The present invention relates to a kind of supply line fault locating instrument and Fault Locating Method, belong to electrical equipment technical field.
Background technology
China's power department extensively adopts the fault detector of electromechanical integration on 10k step power distribution network at present, and after breaking down, the fault detector that send pipeline rider to search action along circuit is determined abort situation.Because power distribution network branched line is many, looking up the fault is very inconvenient, often expends a large amount of human and material resources and time.Especially underground cable, its detection and location are just more difficult.
Domestic 10k step～66k step power network neutral point is to adopt non_direct ground mode substantially.When being defined in non-direct ground system generation single-phase earthing, electric system rules can work two hours.If permanent earth need to disconnect ground path in two hours.It is out of order more than 70% that the fault that single-phase earthing occurs in neutral point isolated neutral system accounts for institute.Aspect the detection method and means to fault, for small current neutral grounding system, in the time there is singlephase earth fault, due to the criterion that does not have obvious curent change feature as earth fault, search this fault is a global difficult problem always.Prior art mainly contains higher hamonic wave zero-sequence component on-line measurement method, higher hamonic wave zero-sequence component off-line measurement method, real component method, neutral grounding by small resistance, Injection Current method, transient signal measurements and calculations method, Low frequency signal injection method etc.In said method, have plenty of and be only suitable for the use in transformer station, when the use on the line having, accuracy is poor, or expense is too high, is not suitable for promoting in distribution system.For various reasons, effect is unsatisfactory for the domestic localization of fault line selection apparatus putting into operation at present.
Application number is that the patent documentation of 99123488.X discloses a kind of fault locating system, utilize " GP only " (Global Positioning System (GPS)) clock to time, main website and the capable ripple of substation reception false voltage are installed at circuit two ends, are calculated in main website and substation circuit two ends elder generation's localization of faults afterwards that the capable ripple of false voltage arrives.It is to be noted when underground cable breaks down, because cable is capacitive, can not produce immediately obvious decline according to delay effect voltage, just decline through regular hour voltage.Causing fault locator not obtain immediately failure message judges soundly to trouble spot.Judge the impact bringing to fault for the time delay of above-mentioned cable fault voltage traveling wave, this patent documentation does not provide solution.
Whether correctly can there is not delay effect in the transmission for the capable ripple of false voltage of overhead transmission line, but effectively extract for travelling wave signal the mutual inductor progress of disease high frequency transient amount that depends on.Research shows, current transformer can the progress of disease up to the current traveling wave signal of 100kHz, but be a difficult problem for the progress of disease of HF voltage row ripple, at present, widely used capacitance type potential transformer on high-voltage fence (C is just walking) is because cutoff frequency is too low, row ripple progress of disease characteristic is not good, and the application of voltage traveling wave location and telemetry is extremely restricted.And the technical scheme about HF voltage row ripple progress of disease device is not disclosed in the patent documentation that application number is 99123488.X.
Summary of the invention
The object of the present invention is to provide a kind of supply line fault locating instrument and Fault Locating Method, prior art is improved, realize the accurate progress of disease of HF voltage row ripple, can accurately locate and find range for the fault of overhead transmission line and underground cable.
Object of the present invention is achieved by the following technical programs:
A kind of supply line fault locating instrument, comprises the positive collecting unit 2 of electronics P, power module 3, time synchronized circuit 4, satellite signal receiver 5, satellite antenna 6, the positive collecting unit 7 of C, high resistant becomes low impedance path 8, high speed acquisition AD converting unit 9, this processor 10 of CP, display screen 11, GPR stops module 12, the main described power module 3 of 3G antenna 13 is given the positive collecting unit 2 of electronics P, time synchronized circuit 4, satellite signal receiver 5, high resistant becomes low impedance path 8, high speed acquisition AD converting unit 9, this processor 10 of CP, display screen 11, GPR stops module 12 and powers, described satellite antenna 6 is connected with satellite signal receiver 5, satellite signal receiver 5 is connected with time synchronized circuit 4, this processor 10 of described time synchronized circuit 4 and CP is connected, the positive collecting unit 2 of described electronics P becomes low impedance path 8 with high resistant and is connected, and high resistant becomes low impedance path 8 and is connected with high speed acquisition AD converting unit 9, and the positive collecting unit 7 of C is connected with high speed acquisition AD converting unit 9, this processor 10 of described high speed acquisition AD converting unit 9 and CP is connected, described display screen 11, GPR stops module 12 and is connected with this processor 10 of CP respectively, and described 3G antenna 13 stops module 12 with GPR and is connected.
A kind of supply line Fault Locating Method, comprising:
Supply line's fault locating instrument is installed on to the two ends of every circuit of electrical network, and every circuit is at least installed two, for underground cable line instantaneous discharge fault, adopt instantaneous voltage electric current product term maximum value direction determining method, be that supply line's fault locating instrument detects when electric current and voltage product term is undergone mutation, detect product term maximum value direction change two measurement points between as fault section;
For overhead transmission line, calculate the synthetic residual voltage step of three-phase o, the phasing degree of calculating step o, when non-fault, residual voltage step o vector is zero, when earth fault occurs, undergo mutation in residual voltage step o phasing degree, according to the variation failure judgement interval at phasing degree, check point two ends;
For overhead transmission line, also can gather current signal, calculate the synthetic zero-sequence current Io of three-phase, the phasing degree of calculating Io, when non-fault, zero-sequence current Io vector is zero, when there is earth fault, zero-sequence current Io undergos mutation at phasing degree, according to the variation failure judgement interval at phasing degree, check point two ends.
Object of the present invention can also further realize by following technical measures:
Aforementioned supply line fault locating instrument, wherein the positive collecting unit 2 of electronics P comprises discharge tube, multiple noninductive resistance, described multiple noninductive resistance is connected, at the two ends of series circuit access high pressure, multiple noninductive resistances dividing potential drop of connecting, adopt 2 resistance to carry out parallel connection at dividing potential drop output terminal, and at a discharge tube of dividing potential drop output terminal access in parallel; Described high resistant becomes low impedance path 8 and comprises 2 amplifiers, and the positive collecting unit 2 of electronics P is sent into the signal after step-down respectively normal phase input end that high resistant becomes 2 amplifiers of low impedance path 8 and carry out the homophase differential amplification of signal.
Aforementioned supply line fault locating instrument, wherein satellite signal receiver 5 is accepted Big Dipper satellite signal.
Compared with prior art, the invention has the beneficial effects as follows: realized the accurate progress of disease of the HF voltage row ripple of overhead transmission line, adopt instantaneous voltage electric current product term maximum value failure judgement for the earth fault of underground cable, the problem that has solved the judgement of voltage traveling wave delay fault, the present invention can accurately locate and find range the fault of overhead transmission line and underground cable.
Accompanying drawing explanation
Fig. 1 is fault locating instrument circuit diagram of the present invention;
Fig. 2 is the positive collecting unit circuit diagram of fault locating instrument electronics P of the present invention;
Fig. 3 is fault locating instrument high resistant step-down resistance channel circuit figure of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, supply line of the present invention fault locating instrument comprises the positive collecting unit 2 of electronics P, power module 3, time synchronized circuit 4, satellite signal receiver 5, satellite antenna 6, the positive collecting unit 7 of C, high resistant becomes low impedance path 8, high speed acquisition AD converting unit 9, this processor 10 of CP, display screen 11, GPR stops module 12, the main described power module 3 of 3G antenna 13 is given the positive collecting unit 2 of electronics P, time synchronized circuit 4, satellite signal receiver 5, high resistant becomes low impedance path 8, high speed acquisition AD converting unit 9, this processor 10 of CP, display screen 11, GPR stops module 12 and powers, described satellite antenna 6 is connected with satellite signal receiver 5, satellite signal receiver 5 is connected with time synchronized circuit 4, this processor 10 of described time synchronized circuit 4 and CP is connected, the positive collecting unit 2 of described electronics P becomes low impedance path 8 with high resistant and is connected, and high resistant becomes low impedance path 8 and is connected with high speed acquisition AD converting unit 9, and the positive collecting unit 7 of C is connected with high speed acquisition AD converting unit 9, this processor 10 of described high speed acquisition AD converting unit 9 and CP is connected, described display screen 11, GPR stops module 12 and is connected with this processor 10 of CP respectively, and described 3G antenna 13 stops module 12 with GPR and is connected.As shown in Figure 2, the positive collecting unit 2 of electronics P comprises discharge tube D1, noninductive resistance R1, R2, R3, R4, R5, described noninductive resistance R1, R2, R3, R4 connect, at the two ends of series circuit access high pressure, described noninductive resistance R1, R2, R3, the R4 dividing potential drop of connecting, a resistance R 5 in parallel and discharge tube D1 again at dividing potential drop output terminal R4 two ends, adopt R4, R5, D1 parallel connection at dividing potential drop output terminal, in order to prevent that resistance from damaging, high pressure enters high resistant step-down resistance channel circuit, damages components and parts.As shown in Figure 3, described high resistant becomes low impedance path 8 and comprises 2 these 1A of amplifier, these 1B, and the normal phase input end that the positive collecting unit 2 of electronics P is sent into 2 amplifiers from the positive 1-1 of P, the positive 2-1 of P respectively by the signal after step-down carries out the homophase differential amplification of signal.The present invention is in order accurately to extract voltage traveling wave signal, specialized designs the positive collecting unit 2 of electronics P, got rid of the wave form distortion that voltage traveling wave causes through existing capacitance type potential transformer.It should be noted that, in high resistant situation, high-frequency signal can produce decay, must increase the passage of high resistant step-down resistance, to guarantee the detection of fault traveling wave signal.High resistant of the present invention becomes low impedance path 8 and adopts homophase differential amplification, and travelling wave signal has been carried out to effective amplification.
Described voltage traveling wave signal is delivered to this processor 10 of CP through the positive collecting unit 2 of electronics P, high resistant change low impedance path 8, high speed acquisition AD converting unit 9, and current traveling wave signal is delivered to this processor 10 of CP through the positive collecting unit 7 of C, high speed acquisition AD converting unit 9.GPR stops module 12 for send the fault-signal gathering with note form to grid monitoring system server.
Use described supply line fault instrument to carry out Fault Locating Method, comprising:
Supply line's fault locating instrument is installed on to the two ends of every circuit of electrical network, and every circuit is at least installed two, in the time breaking down in certain position of an electrical network circuit, trouble spot can produce one group of false voltage current traveling wave and propagate to circuit two ends, carry out synchronously owing to adopting satellite timing signal, the data sampling time sequence of each supply line fault locating instrument is synchronous, therefore the supply line's fault locating instrument that can put two ends according to line fault receives the mistiming of fault traveling wave and calculates position of failure point, the time synchronized circuit of each supply line's fault locating instrument accepts Beidou satellite system or GP stops satellite system timing signal, make all supply lines fault locating instrument synchronous, guarantee the accurate of range finding.
For underground cable line, the larger master of instantaneous discharge fault current of isolated neutral system power transmission cable but change in voltage be not generally very large master because I step product numerical value is larger, trouble spot direction can easily detect.Therefore, for underground cable line instantaneous discharge fault, adopt instantaneous voltage electric current product term maximum value direction determining method, be that supply line's fault locating instrument detects when electric current and voltage product term is undergone mutation, measured value before and after sudden change is delivered to system server, detect product term maximum value side and undergo mutation, and between the positive and negative two relative measurement points of direction as fault section.
For overhead transmission line, calculate the synthetic residual voltage step of three-phase o, calculate the phasing degree of step o, when non-fault, residual voltage step o vector is zero, and when earth fault occurs, undergo mutation in residual voltage step o phasing degree, measured value before and after sudden change is delivered to system server, according to the variation failure judgement interval at phasing degree, two ends.Also can gather current signal, calculate the synthetic zero-sequence current Io of three-phase, calculate the phasing degree of Io, when non-fault, zero-sequence current Io vector is zero, and when there is earth fault, zero-sequence current Io undergos mutation at phasing degree, measured value before and after sudden change is delivered to system server, according to the variation failure judgement interval at phasing degree, two ends.
In addition to the implementation, the present invention can also have other embodiments, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of requirement of the present invention.
Claims (4)
1. supply line's fault locating instrument, is characterized in that, comprises electronics PT collecting unit (2), power module (3), time synchronized circuit (4), satellite signal receiver (5), satellite antenna (6), CT collecting unit (7), high resistant becomes low impedance path (8), high speed acquisition AD converting unit (9), CPU processor (10), display screen (11), GPRS module (12), 3G antenna (13), described power module (3) is given electronics PT collecting unit (2), time synchronized circuit (4), satellite signal receiver (5), high resistant becomes low impedance path (8), high speed acquisition AD converting unit (9), CPU processor (10), display screen (11), GPRS module (12) power supply, described satellite antenna (6) is connected with satellite signal receiver (5), satellite signal receiver (5) is connected with time synchronized circuit (4), described time synchronized circuit (4) is connected with CPU processor (10), described electronics PT collecting unit (2) becomes low impedance path (8) with high resistant and is connected, high resistant becomes low impedance path (8) and is connected with high speed acquisition AD converting unit (9), CT collecting unit (7) is connected with high speed acquisition AD converting unit (9), described high speed acquisition AD converting unit (9) is connected with CPU processor (10), described display screen (11), GPRS module (12) is connected with CPU processor (10) respectively, and described 3G antenna (13) is connected with GPRS module (12).
2. supply line as claimed in claim 1 fault locating instrument, it is characterized in that, described electronics PT collecting unit (2) comprises discharge tube, multiple noninductive resistance, described multiple noninductive resistance is connected, at the two ends of series circuit access high pressure, multiple noninductive resistances dividing potential drop of connecting, adopts 2 resistance to carry out parallel connection at dividing potential drop output terminal, and at a discharge tube of dividing potential drop output terminal access in parallel; Described high resistant becomes low impedance path (8) and comprises 2 amplifiers, and electronics PT collecting unit (2) is sent into the signal after step-down respectively normal phase input end that high resistant becomes 2 amplifiers of low impedance path (8) and carry out the homophase differential amplification of signal.
3. supply line as claimed in claim 1 fault locating instrument, is characterized in that, described satellite signal receiver (5) is accepted Big Dipper satellite signal.
4. the Fault Locating Method of supply line as claimed in claim 1 fault locating instrument, is characterized in that, comprising:
Supply line's fault locating instrument is installed on to the two ends of every circuit of electrical network, and every circuit is at least installed two, for underground cable line instantaneous discharge fault, adopt instantaneous voltage electric current product term maximum value direction determining method, be that supply line's fault locating instrument detects when electric current and voltage product term is undergone mutation, detect product term maximum value direction change two measurement points between as fault section;
For overhead transmission line, calculate the synthetic residual voltage Vo of three-phase, the phasing degree of calculating Vo, when non-fault, residual voltage Vo vector is zero, when there is earth fault, residual voltage Vo undergos mutation at phasing degree, according to the variation failure judgement interval at phasing degree, check point two ends;
For overhead transmission line, gather current signal, calculate the synthetic zero-sequence current Io of three-phase, the phasing degree of calculating Io, when non-fault, zero-sequence current Io vector is zero, when there is earth fault, zero-sequence current Io undergos mutation at phasing degree, according to the variation failure judgement interval at phasing degree, check point two ends.
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Cited By (5)
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| CN104535895A (en) * | 2015-01-09 | 2015-04-22 | 山东康威通信技术股份有限公司 | Cable-and-overhead-line hybrid line fault section method based on synchronous sampling technology |
| CN104569729A (en) * | 2015-01-29 | 2015-04-29 | 深圳市科陆电子科技股份有限公司 | Fault indicator based power distribution network single-phase earth fault detection method and fault indicator based power distribution network single-phase earth fault detection system |
| CN107748317A (en) * | 2017-11-29 | 2018-03-02 | 电子科技大学 | A kind of Precise Position System of buried cable high resistive fault |
| CN109613383A (en) * | 2018-12-27 | 2019-04-12 | 中国电力科学研究院有限公司 | Meter and the alternating current circuit fault judgment method and system of direct current access |
| CN115840109A (en) * | 2022-12-23 | 2023-03-24 | 重庆峰极智能科技研究院有限公司 | Low-voltage power supply line fault identification method based on current disturbance |
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| CN104535895A (en) * | 2015-01-09 | 2015-04-22 | 山东康威通信技术股份有限公司 | Cable-and-overhead-line hybrid line fault section method based on synchronous sampling technology |
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| CN107748317A (en) * | 2017-11-29 | 2018-03-02 | 电子科技大学 | A kind of Precise Position System of buried cable high resistive fault |
| CN107748317B (en) * | 2017-11-29 | 2019-10-29 | 电子科技大学 | A kind of Precise Position System of buried cable high resistive fault |
| CN109613383A (en) * | 2018-12-27 | 2019-04-12 | 中国电力科学研究院有限公司 | Meter and the alternating current circuit fault judgment method and system of direct current access |
| CN115840109A (en) * | 2022-12-23 | 2023-03-24 | 重庆峰极智能科技研究院有限公司 | Low-voltage power supply line fault identification method based on current disturbance |
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