CN103675569A - Earth fault detection device and system for overhead line - Google Patents
Earth fault detection device and system for overhead line Download PDFInfo
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- CN103675569A CN103675569A CN201210328790.7A CN201210328790A CN103675569A CN 103675569 A CN103675569 A CN 103675569A CN 201210328790 A CN201210328790 A CN 201210328790A CN 103675569 A CN103675569 A CN 103675569A
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Abstract
The invention discloses an earth fault detection device and system for an overhead line. The detection device comprises an acquisition device, a converter and a controller, wherein the acquisition device comprises three collectors which are respectively in electric connection with three drainage wires in the overhead line and used for collecting current signals of the three drainage wires of the overhead line; the converter is in electric connection with the acquisition device and used for conducting synchronous sampling treatment on the current signals of the three drainage wires to acquire digital signals corresponding to the current signals; the controller is connected with the converter and used for conducting Fourier transformation on the digital signals to acquire zero sequence current and sending out a signal indicating that the overhead line is in an earth fault when the zero sequence current is non-zero. Through the detection device and system, the zero sequence current of the overhead line can be accurately measured, and accordingly, the effect of accurately detecting whether the overhead line is in an earth fault is achieved.
Description
Technical field
The present invention relates to power domain, in particular to a kind of pick-up unit and system of overhead transmission line earth fault.
Background technology
Because the geographic range that relates to of power supply overhead transmission line is very wide, for guaranteeing that when overhead transmission line breaks down electric power first-aid personnel can find the trouble spot of circuit fast, shorten the repairing time, along overhead transmission line, aerial conductor fault indicator is generally installed.Respectively aerial conductor fault indicator is directly installed on three-phase line, the aerial conductor fault indicator on three-phase works alone separately, can only detect single-phase current, generally cannot distinguish load current and fault current.When indication phase fault, identical with cable-type indicator principle of work, can adopt current ration mode or current break mode.But in indication during earth fault, because aerial conductor fault indicator generally cannot detect zero-sequence current, so cannot judge earth fault by detecting the method for zero-sequence current.
For small current neutral grounding system, when circuit generation singlephase earth fault, single-phase to vagabond current when the transient current that trouble spot is flow through generally can be greater than electrical network and normally moves, and have a mutation process, harmonic current increases simultaneously, especially quintuple harmonics.Phase place, size or quintuple harmonics by the first half-wave of judgement ground connection transient current, just can judge to a certain extent singlephase earth fault, but this method accuracy is not high, especially for the system of grounding through arc.And for aerial conductor fault indicator, because cannot measure zero-sequence current, be difficult to isolate ground current among single-phase current, just more cannot judge singlephase earth fault.
For can not measure the zero-sequence current of overhead transmission line in prior art due to fault detector, and effective detection of ground faults, thereby cause repair personnel can not locate fast the problem of trouble spot, effective solution is not yet proposed at present.
Summary of the invention
For correlation technique because fault detector can not be measured the zero-sequence current of overhead transmission line, and effective detection of ground faults, thereby cause repair personnel can not locate fast the problem of trouble spot, effective solution is not yet proposed at present, for this reason, fundamental purpose of the present invention is to provide a kind of pick-up unit and system of overhead transmission line earth fault, to address the above problem.
To achieve these goals, according to an aspect of the present invention, a kind of pick-up unit of overhead transmission line earth fault is provided, this device comprises: harvester, comprise three collectors, set up and be electrically connected to three drainage threads in overhead transmission line respectively, for gathering the current signal of three drainage threads of overhead transmission line; Converter, is electrically connected to harvester, for the current signal of three drainage threads being carried out to synchronized sampling processing to obtain the digital signal of answering in contrast; Controller, is connected with converter, for digital signal being carried out to Fourier transform to obtain zero-sequence current, and in the situation that zero-sequence current is non-zero, sends the signal that overhead transmission line exists earth fault.
Further, controller comprises: the first counter, connects with converter, for digital signal is carried out to Fourier transform, to obtain one or more conversion parameters; First processor, connects with the first counter, for detection of conversion parameter, whether comprises zero-sequence current; The second processor, is connected with first processor, in the situation that conversion parameter comprises zero-sequence current, judges whether zero-sequence current is zero; Output unit, is connected with the second processor, for send the signal that overhead transmission line exists earth fault in the situation that zero-sequence current is non-zero.
Further, converter comprises: sampling apparatus, and set up and be electrically connected to harvester, for the current signal collecting is carried out to synchronized sampling processing according to predetermined sampling frequency, to obtain discrete signal; The second counter, connects with sampling apparatus, for discrete signal is carried out to vector calculus, to obtain digital signal.
Further, sampling apparatus comprises: the 3rd processor, be connected with harvester, and for the current signal of three drainage threads is carried out to time synchronizing, the current signal after synchronous with acquisition time; Four-processor, is connected with the 3rd processor, carries out sampling processing, to obtain discrete signal for the current signal to after time synchronized.
Further, collector comprises: one or more fault detectors, and set up and be electrically connected to corresponding drainage thread, for gathering the current signal of this drainage thread; Solar panel, connects with fault detector, for the sun power receiving is converted into electric energy, and provides electric energy to fault detector.
Further, collector also comprises: one or more fault detectors, and set up and be electrically connected to corresponding drainage thread, for gathering the current signal of this drainage thread; Mutual inductor, is connected between fault detector and the drainage thread of correspondence, for obtaining electric energy from this drainage thread, and provides electric energy to fault detector.
Further, converter also comprises: acquisition device, connects with harvester, for obtaining the current signal of three drainage threads that harvester collects.
Further, converter comprises analog to digital converter.
To achieve these goals, according to another aspect of the present invention, provide a kind of detection system of overhead transmission line earth fault, this system comprises: at least one overhead transmission line, every overhead transmission line comprises pick-up unit.
By pick-up unit and the system of overhead transmission line earth fault of the present invention, the collector of employing pick-up unit can be measured the electric current of three drainage threads of overhead transmission line in real time, converter carries out synchronized sampling to the current signal collecting, then controller and to sampling after digital signal carry out signal processing, obtain zero-sequence current parameter, solved and in prior art, due to fault detector, can not measure the zero-sequence current of overhead transmission line, and effective detection of ground faults, thereby cause repair personnel can not locate fast the problem of trouble spot, realized the zero-sequence current of Measurement accuracy overhead transmission line, thereby accurately detect the effect whether overhead transmission line exists earth fault.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is according to the structural representation of the pick-up unit of the embodiment of the present invention;
Fig. 2 is according to the scheme of installation of the pick-up unit of the embodiment of the present invention; And
Fig. 3 is the detailed structure schematic diagram according to detection system of the present invention.
Embodiment
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
Fig. 1 is according to the structural representation of the pick-up unit of the embodiment of the present invention.Fig. 2 is according to the scheme of installation of the pick-up unit of the embodiment of the present invention.As depicted in figs. 1 and 2, this device can comprise: harvester 10, comprise three collectors, and be electrically connected to three drainage threads in overhead transmission line respectively, for gathering the current signal of three drainage threads of overhead transmission line; Converter 30, is electrically connected to harvester 10, for the current signal of three drainage threads being carried out to synchronized sampling processing to obtain the digital signal of answering in contrast; Controller 50, is connected with converter 30, for digital signal being carried out to Fourier transform to obtain zero-sequence current, and in the situation that zero-sequence current is non-zero, sends the signal that overhead transmission line exists earth fault.
Adopt the pick-up unit of the application's overhead transmission line earth fault, by three collectors in harvester are set up and are electrically connected to three drainage threads in overhead transmission line respectively, gather the current signal of three drainage threads of overhead transmission line, then converter carries out synchronized sampling processing to the current signal of three drainage threads, to obtain the digital signal of answering in contrast, last controller carries out Fourier transform to the digital signal getting, to obtain with individual or a plurality of conversion parameters, wherein, at conversion parameter, comprise zero-sequence current, and in the situation that zero-sequence current is non-zero, controller sends the signal that overhead transmission line exists earth fault.Yet in the prior art, because fault detector is arranged separately on circuit, work independently, and the consideration for insulation, can not between three independent fault detectors, connect signal wire again, thereby cannot measure zero-sequence current by fault detector, thereby cannot judge singlephase earth fault.The application's pick-up unit, by collector, can measure in real time the electric current of three drainage threads of overhead transmission line, converter carries out synchronized sampling to the current signal collecting, then controller and to sampling after digital signal carry out signal processing, obtain zero-sequence current parameter, solved and in prior art, due to fault detector, can not measure the zero-sequence current of overhead transmission line, and effective detection of ground faults, thereby cause repair personnel can not locate fast the problem of trouble spot, realized the zero-sequence current of Measurement accuracy overhead transmission line, thereby accurately detect the effect whether overhead transmission line exists earth fault.
Wherein, three three-phases that drainage thread can be a transmission line of electricity of overhead transmission line, are respectively A phase, B phase and C phase, as shown in Figure 2, harvester 10 are arranged on overhead transmission line, and converter 30 and controller 50 are arranged on support bar.Particularly, three collectors are set to one group of real-time current signal that gathers respectively A phase, B phase and C phase, then by 30 pairs of three-phase current signals that collect of converter, carry out synchronized sampling processing, get corresponding digital signal, then digital signal is carried out to Fourier transform, calculate the conversion parameter that comprises positive-sequence component, negative sequence component, zero-sequence current and harmonic component, controller 50 is processed these conversion parameters afterwards, in the situation that the zero-sequence current in these parameters is non-zero, there is earth fault in this overhead transmission line.Wherein, support bar can be electric pole, and converter 30 and controller 50 can be arranged on same communicating terminal.
In above-described embodiment of the application, controller 50 can comprise: the first counter, connects with converter 30, for digital signal is carried out to Fourier transform, to obtain one or more conversion parameters; First processor, connects with the first counter, for detection of conversion parameter, whether comprises zero-sequence current; The second processor, is connected with first processor, in the situation that conversion parameter comprises zero-sequence current, judges whether zero-sequence current is zero; Output unit, is connected with the second processor, for send the signal that overhead transmission line exists earth fault in the situation that zero-sequence current is non-zero.
Particularly, the digital signal that the first counter obtains after converter 30 is processed is carried out Fourier transform, to obtain the conversion parameter that comprises positive-sequence component, negative sequence component, zero-sequence current and harmonic component, then first processor detects in conversion parameter whether comprise zero-sequence current, in the situation that conversion parameter comprises zero-sequence current, the second processor judges that whether zero-sequence current is zero, and in the situation that zero-sequence current is zero, send the signal that overhead transmission line exists earth fault.
According to the abovementioned embodiments of the present invention, converter 30 can comprise: sampling apparatus, and set up and be electrically connected to harvester 10, for the current signal collecting is carried out to synchronized sampling processing according to predetermined sampling frequency, to obtain discrete signal; The second counter, connects with sampling apparatus, for discrete signal is carried out to vector calculus, to obtain digital signal.
According to above-described embodiment of the application, sampling apparatus can comprise: the 3rd processor, be connected with harvester 10, and for the current signal of three drainage threads is carried out to time synchronizing, the current signal after synchronous with acquisition time; Four-processor, is connected with the 3rd processor, carries out sampling processing, to obtain discrete signal for the current signal to after time synchronized.
Particularly, the 3rd processor carries out time synchronizing by the current signal of three drainage threads that get, the current signal after synchronous with acquisition time, and then the current signal of four-processor after to time synchronized sampled, and obtains discrete signal.Wherein, timing tracking accuracy generally can reach 50 microseconds, and 64 points of each periodic sampling of each periodic sampling carry out FFT calculating.By the precise time synchronized algorithm of the 3rd processor, guarantee three-phase current sampling can be accurately, synchronously complete.
According to the abovementioned embodiments of the present invention, collector can comprise: one or more fault detectors, and set up and be electrically connected to corresponding drainage thread, for gathering the current signal of this drainage thread; Solar panel, connects with fault detector, for the sun power receiving is converted into electric energy, and provides electric energy to fault detector.Wherein, fault detector, daytime board turning indication fault, night flashing light indication fault; If use wireless handheld terminal, can also preserve the historical record of fault.
Collector can also comprise: one or more fault detectors, and set up and be electrically connected to corresponding drainage thread, for gathering the current signal of this drainage thread; Mutual inductor, is connected between fault detector and the drainage thread of correspondence, for obtaining electric energy from this drainage thread, and provides electric energy to fault detector.Wherein, mutual inductor adopts the iron core of high permeability, coordinates the circuit design of micro-power consumption, and making fault detector be greater than 10A at line current can normally work.And, built-in super capacitor or boosting battery in fault detector (can indicate for night), can reach more than 8 years serviceable life.
In above-described embodiment of the application, converter 30 can also comprise: acquisition device, connects with harvester 10, for obtaining the current signal of three drainage threads that harvester 10 collects.
Particularly, as shown in Figure 2, acquisition device can adopt short-distance wireless communication technology, realizes the wireless telecommunications of harvester 10 and converter 30.Wherein, wireless communication technique can adopt Bluetooth technology, adopts micro power radio communication chip, three fault detector automatic network-buildings, the synchronous and transmission data of automatic time.
In above-described embodiment of the application, converter 30 can comprise analog to digital converter.
The application provides a kind of detection system of overhead transmission line earth fault, and this system can comprise: at least one overhead transmission line, every overhead transmission line can comprise pick-up unit.
Adopt the detection system of overhead transmission line earth fault of the present invention, by install pick-up unit on overhead transmission line, pick-up unit can Real-time Collection overhead transmission line the current signal of three drainage threads, and the current signal collecting carries out synchronized sampling, then the digital signal after sampling is carried out to signal processing, obtain zero-sequence current parameter, solved and in prior art, due to fault detector, can not measure the zero-sequence current of overhead transmission line, and effective detection of ground faults, thereby cause repair personnel can not locate fast the problem of trouble spot, realized the zero-sequence current of Measurement accuracy overhead transmission line, thereby accurately detect the effect whether overhead transmission line exists earth fault.
Fig. 3 is the detailed structure schematic diagram according to detection system of the present invention.As shown in Figure 3, earth fault is between P3 and P4 pick-up unit, C phase ground connection, the circuit zero sequence current ratio of passing through so P1 and P3 indicator is larger, and very little through the zero-sequence current of P2 and P4 indicator circuit, by measuring size or the Sudden Changing Rate of zero-sequence current, just can judge whether exactly ground connection.When overhead transmission line is detected to short trouble, except needs detect three-phase current, also will in conjunction with and the size of zero-sequence current come the position of failure judgement point.Particularly, in pole line small resistance grounding system when there is singlephase earth fault, and zero-sequence current is larger, conventionally, between 100A-1000A, much larger than capacitance current, as long as therefore can measure exactly zero-sequence current, just can judge exactly singlephase earth fault.
From above description, can find out, the present invention has realized following technique effect: by install pick-up unit on overhead transmission line, pick-up unit can Real-time Collection overhead transmission line the current signal of three drainage threads, and the current signal collecting carries out synchronized sampling, then the digital signal after sampling is carried out to signal processing, obtain zero-sequence current parameter, solved and in prior art, due to fault detector, can not measure the zero-sequence current of overhead transmission line, and effective detection of ground faults, thereby cause repair personnel can not locate fast the problem of trouble spot, realized the zero-sequence current of Measurement accuracy overhead transmission line, thereby accurately detect the effect whether overhead transmission line exists earth fault.Use the application's Apparatus and system, can realize the automatic decision function to overhead transmission line phase fault and singlephase earth fault interval, make power supply department can find fast line fault point, increase work efficiency, shorten the accident maintenance time.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in memory storage and be carried out by calculation element, or they are made into respectively to each integrated circuit modules, or a plurality of modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. a pick-up unit for overhead transmission line earth fault, is characterized in that, comprising:
Harvester, comprises three collectors, sets up and is electrically connected to respectively, for gathering the current signal of three described drainage threads of described overhead transmission line with three drainage threads in overhead transmission line;
Converter, is electrically connected to described harvester, for the current signal of three described drainage threads being carried out to synchronized sampling processing to obtain the digital signal of answering in contrast;
Controller, is connected with described converter, for described digital signal being carried out to Fourier transform to obtain zero-sequence current, and in the situation that described zero-sequence current is non-zero, sends the signal that described overhead transmission line exists earth fault.
2. device according to claim 1, is characterized in that, described controller comprises:
The first counter, connects with described converter, for described digital signal is carried out to Fourier transform, to obtain one or more conversion parameters;
First processor, connects with described the first counter, for detection of described conversion parameter, whether comprises described zero-sequence current;
The second processor, is connected with described first processor, in the situation that described conversion parameter comprises described zero-sequence current, judges whether described zero-sequence current is zero;
Output unit, is connected with described the second processor, for send the signal that described overhead transmission line exists earth fault in the situation that described zero-sequence current is non-zero.
3. device according to claim 2, is characterized in that, described converter comprises:
Sampling apparatus, sets up and is electrically connected to described harvester, for the described current signal collecting is carried out to synchronized sampling processing according to predetermined sampling frequency, to obtain discrete signal;
The second counter, connects with described sampling apparatus, for described discrete signal is carried out to vector calculus, to obtain described digital signal.
4. device according to claim 3, is characterized in that, described sampling apparatus comprises:
The 3rd processor, is connected with described harvester, for the current signal of three described drainage threads is carried out to time synchronizing, and the current signal after synchronous with acquisition time;
Four-processor, is connected with described the 3rd processor, carries out sampling processing, to obtain described discrete signal for the current signal to after described time synchronized.
5. device according to claim 4, is characterized in that, described collector comprises:
One or more fault detectors, set up and are electrically connected to corresponding described drainage thread, for gathering the current signal of this drainage thread;
Solar panel, connects with described fault detector, for the sun power receiving is converted into electric energy, and provides described electric energy to described fault detector.
6. device according to claim 4, is characterized in that, described collector also comprises:
One or more fault detectors, set up and are electrically connected to corresponding described drainage thread, for gathering the current signal of this drainage thread;
Mutual inductor, is connected between described fault detector and the described drainage thread of correspondence, for obtaining electric energy from this drainage thread, and provides described electric energy to described fault detector.
7. according to the device described in claim 5 or 6, it is characterized in that, described converter also comprises:
Acquisition device, connects with described harvester, for obtaining the current signal of three described drainage threads that described harvester collects.
8. device according to claim 7, is characterized in that, described converter comprises analog to digital converter.
9. a detection system for overhead transmission line earth fault, is characterized in that, comprising:
At least one overhead transmission line, every described overhead transmission line comprises the pick-up unit described in any one in claim 1 to 8.
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| CN201210328790.7A CN103675569B (en) | 2012-09-06 | 2012-09-06 | The detection Apparatus and system of aerial line ground fault |
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| CN201210328790.7A CN103675569B (en) | 2012-09-06 | 2012-09-06 | The detection Apparatus and system of aerial line ground fault |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104391226A (en) * | 2014-11-28 | 2015-03-04 | 国家电网公司 | Distribution line online monitoring collection terminal and collection method supporting three-phase synchronous collection |
| CN106646126A (en) * | 2016-12-09 | 2017-05-10 | 国网北京市电力公司 | Method, device and system for locating fault |
| CN107796979A (en) * | 2017-10-02 | 2018-03-13 | 国网山西省电力公司电力科学研究院 | The overhead distribution zero-sequence current waveform acquisition equipment of anti-nearby lines interference |
| CN110888022A (en) * | 2019-12-20 | 2020-03-17 | 海南电网有限责任公司电力科学研究院 | Single-phase earth fault detection and positioning device for power distribution network |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02266802A (en) * | 1989-04-07 | 1990-10-31 | Hitachi Ltd | Current detector |
| CN1191315A (en) * | 1997-12-04 | 1998-08-26 | 中国人民解放军第二炮兵工程学院技术开发中心 | High-voltage overhead line on-line failure distance finding method and instrument installation |
| CN101839958A (en) * | 2010-04-28 | 2010-09-22 | 华北电力大学 | Electrified locating device for single-phase earth fault of electric distribution network |
| CN102135587A (en) * | 2011-01-31 | 2011-07-27 | 吕强 | Fault monitoring method and system of power line |
| US20120150460A1 (en) * | 2009-08-31 | 2012-06-14 | Przemyslaw Balcerek | Method of fault phase selection and fault type determination |
| CN202351371U (en) * | 2011-11-21 | 2012-07-25 | 广西星宇智能电气有限公司 | Small current neutral grounding route selection device of self-adaptation zero sequence current fault features |
-
2012
- 2012-09-06 CN CN201210328790.7A patent/CN103675569B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02266802A (en) * | 1989-04-07 | 1990-10-31 | Hitachi Ltd | Current detector |
| CN1191315A (en) * | 1997-12-04 | 1998-08-26 | 中国人民解放军第二炮兵工程学院技术开发中心 | High-voltage overhead line on-line failure distance finding method and instrument installation |
| US20120150460A1 (en) * | 2009-08-31 | 2012-06-14 | Przemyslaw Balcerek | Method of fault phase selection and fault type determination |
| CN101839958A (en) * | 2010-04-28 | 2010-09-22 | 华北电力大学 | Electrified locating device for single-phase earth fault of electric distribution network |
| CN102135587A (en) * | 2011-01-31 | 2011-07-27 | 吕强 | Fault monitoring method and system of power line |
| CN202351371U (en) * | 2011-11-21 | 2012-07-25 | 广西星宇智能电气有限公司 | Small current neutral grounding route selection device of self-adaptation zero sequence current fault features |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104391226A (en) * | 2014-11-28 | 2015-03-04 | 国家电网公司 | Distribution line online monitoring collection terminal and collection method supporting three-phase synchronous collection |
| CN106646126A (en) * | 2016-12-09 | 2017-05-10 | 国网北京市电力公司 | Method, device and system for locating fault |
| CN107796979A (en) * | 2017-10-02 | 2018-03-13 | 国网山西省电力公司电力科学研究院 | The overhead distribution zero-sequence current waveform acquisition equipment of anti-nearby lines interference |
| CN107796979B (en) * | 2017-10-02 | 2019-12-13 | 国网山西省电力公司电力科学研究院 | Zero sequence current waveform acquisition device for overhead distribution line with near line interference resistance |
| CN110888022A (en) * | 2019-12-20 | 2020-03-17 | 海南电网有限责任公司电力科学研究院 | Single-phase earth fault detection and positioning device for power distribution network |
| CN110888022B (en) * | 2019-12-20 | 2021-10-08 | 海南电网有限责任公司电力科学研究院 | Single-phase earth fault detection and positioning device for power distribution network |
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