CN202929145U - Device and system for aerial line grounding fault detection - Google Patents
Device and system for aerial line grounding fault detection Download PDFInfo
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- CN202929145U CN202929145U CN201220453850.3U CN201220453850U CN202929145U CN 202929145 U CN202929145 U CN 202929145U CN 201220453850 U CN201220453850 U CN 201220453850U CN 202929145 U CN202929145 U CN 202929145U
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Abstract
The utility model discloses a device and a system for detecting aerial line grounding fault. The device for detecting an aerial line grounding fault comprises an acquisition device including three collectors which are respectively connected with three drainage wires on the aerial line and are used for acquiring current signals of the three drainage wires on the aerial line, a converter which is in electrical connection with the acquisition device and is used for carrying out synchronous sampling processing of the current signals of the three drainage wires to acquire corresponding digital signals, and a controller which is connected with the converter and is used for carrying out Fourier transformation of the digital signals to acquire zero sequence current. According to the device and the system for detecting the aerial line grounding fault, accurate measurement of the zero sequence current on the aerial line is realized, so whether the grounding fault exists on the aerial line can be accurately detected.
Description
Technical field
The utility model 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, can find fast the trouble spot of circuit for guaranteeing when overhead transmission line breaks down electric power first-aid personnel, shorten the repairing time, along overhead transmission line aerial conductor fault indicator is installed generally.Respectively aerial conductor fault indicator is directly installed on the three-phase line, the aerial conductor fault indicator on the three-phase works alone separately, can only detect single-phase current, can't distinguish load current and fault current generally speaking.When the indication phase fault, identical with cable-type indicator principle of work, can adopt current ration mode or current break mode.But when indication earth fault, because generally aerial conductor fault indicator can't detect zero-sequence current, so can't judge earth fault by the method that detects 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 the trouble spot is flow through generally can normally move greater than electrical network, and a mutation process is arranged, harmonic current increases simultaneously, especially quintuple harmonics.By judging phase place, size or the quintuple harmonics of the first half-wave of 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 can't measure zero-sequence current, be difficult among single-phase current, isolate ground current, just more can't judge singlephase earth fault.
For in the prior art because fault detector can not be measured the zero-sequence current of overhead transmission line, and effective detection of ground faults, thus cause the repair personnel can not locate fast the problem of trouble spot, effective solution is not yet proposed at present.
The utility model content
Can not measure the zero-sequence current of overhead transmission line owing to fault detector for correlation technique, and effective detection of ground faults, thereby cause the 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 utility model 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 utility model, a kind of pick-up unit of overhead transmission line earth fault is provided, this device comprises: harvester, comprise three collectors, respectively with overhead transmission line in three drainage threads set up and be electrically connected, be used for the current signal of three drainage threads of collection overhead transmission line; Converter is electrically connected with harvester, carries out synchronized sampling for the current signal to three drainage threads and processes to obtain corresponding with it digital signal; Controller is connected with converter, is used for digital signal is carried out Fourier transform to obtain zero-sequence current.
Further, controller comprises: the first counter, connect with converter, and be used for digital signal is carried out Fourier transform, to obtain one or more conversion parameters; First processor connects with the first counter, whether comprises zero-sequence current for detection of conversion parameter; The second processor is connected with first processor, is used for comprising in the situation of zero-sequence current at conversion parameter, judges whether zero-sequence current is zero; Output unit is connected with the second processor, is used for sending the signal that there is earth fault in overhead transmission line under zero-sequence current is the situation of non-zero.
Further, converter comprises: sampling apparatus, be electrically connected with harvester foundation, and be used for that the current signal that collects is carried out synchronized sampling according to predetermined sampling frequency and process, to obtain discrete signal; The second counter connects with sampling apparatus, is used for discrete signal is carried out vector calculus, to obtain digital signal.
Further, sampling apparatus comprises: the 3rd processor, be connected with harvester, and be used for the current signal of three drainage threads is carried out time synchronizing, with the current signal of acquisition time after synchronously; Four-processor is connected with the 3rd processor, is used for the current signal after the time synchronized is carried out sampling processing, to obtain discrete signal.
Further, collector comprises: one or more fault detectors, set up electrical connection with corresponding drainage thread, and be used for gathering the current signal of this drainage thread; Solar panel connects with fault detector, is used for the sun power that receives is converted into electric energy, and provides electric energy to fault detector.
Further, collector comprises: one or more fault detectors, set up electrical connection with corresponding drainage thread, and be used for gathering the current signal of this drainage thread; Mutual inductor is connected between the drainage thread of fault detector and correspondence, is used for obtaining electric energy from this drainage thread, and provides electric energy to fault detector.
Further, converter also comprises: deriving means, connect with harvester, and be used 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 utility model, 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.
Pick-up unit and system by the utility model overhead transmission line earth fault, 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 that collects, then controller and the digital signal after the sampling is carried out signal process, obtain the zero-sequence current parameter, fault detector solved in the prior art owing to can not be measured the zero-sequence current of overhead transmission line, and effective detection of ground faults, thereby cause the repair personnel can not locate fast the problem of trouble spot, realize the zero-sequence current of Measurement accuracy overhead transmission line, thereby accurately detected the effect whether overhead transmission line exists earth fault.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, consists of the application's a part, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not consist of improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation according to the pick-up unit of the utility model embodiment;
Fig. 2 is the scheme of installation according to the pick-up unit of the utility model embodiment; And
Fig. 3 is the detailed construction synoptic diagram according to detection system of the present utility model.
Embodiment
Need to prove that in the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the utility model in detail.
Fig. 1 is the structural representation according to the pick-up unit of the utility model embodiment.Fig. 2 is the scheme of installation according to the pick-up unit of the utility model embodiment.As depicted in figs. 1 and 2, this device can comprise: harvester 10, comprise three collectors, and be electrically connected with three drainage threads in the overhead transmission line respectively, be used for gathering the current signal of three drainage threads of overhead transmission line; Converter 30 is electrically connected with harvester 10, carries out synchronized sampling for the current signal to three drainage threads and processes to obtain corresponding with it digital signal; Controller 50 is connected with converter 30, is used for digital signal is carried out Fourier transform to obtain zero-sequence current.Wherein, be in the situation of non-zero at zero-sequence current, controller 50 sends the signal that there is earth fault in overhead transmission line.
Adopt the pick-up unit of the application's overhead transmission line earth fault, by with three collectors in the harvester respectively with overhead transmission line in three drainage threads set up and be electrically connected, gather the current signal of three drainage threads of overhead transmission line, then converter carries out the synchronized sampling processing to the current signal of three drainage threads, to obtain corresponding with it digital signal, last controller carries out Fourier transform to the digital signal that gets access to, to obtain one or more conversion parameters, wherein, in conversion parameter, comprise zero-sequence current, and be in the situation of non-zero at zero-sequence current, controller sends the signal that there is earth fault in overhead transmission line.Yet in the prior art, because fault detector is arranged separately on the circuit, work independently, and the consideration for insulation, can not between three independent fault detectors, connect signal wire again, thereby can't measure zero-sequence current by fault detector, thereby can't judge singlephase earth fault.Pick-up unit of the present utility model, can measure in real time the electric current of three drainage threads of overhead transmission line by collector, converter carries out synchronized sampling to the current signal that collects, then controller and the digital signal after the sampling is carried out signal process, obtain the zero-sequence current parameter, fault detector solved in the prior art owing to can not be measured the zero-sequence current of overhead transmission line, and effective detection of ground faults, thereby cause the repair personnel can not locate fast the problem of trouble spot, realize the zero-sequence current of Measurement accuracy overhead transmission line, thereby accurately detected 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 installed on the overhead transmission line, and converter 30 and controller 50 are installed on the 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 carrying out synchronized sampling by 30 pairs of three-phase current signals that collect of converter processes, get access to corresponding digital signal, then digital signal is carried out 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, zero-sequence current in these parameters is in the situation of non-zero, and there is earth fault in this overhead transmission line.Wherein, support bar 70 can be electric pole, and converter 30 and controller 50 can be installed on the same communicating terminal.
In above-described embodiment of the application, controller 50 can comprise: the first counter, connect with converter 30, and be used for digital signal is carried out Fourier transform, to obtain one or more conversion parameters; First processor connects with the first counter, whether comprises zero-sequence current for detection of conversion parameter; The second processor is connected with first processor, is used for comprising in the situation of zero-sequence current at conversion parameter, judges whether zero-sequence current is zero; Output unit is connected with the second processor, is used for sending the signal that there is earth fault in overhead transmission line under zero-sequence current is the situation of non-zero.
Particularly, the digital signal that the first counter obtains after processing through converter 30 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 the conversion parameter whether comprise zero-sequence current, in conversion parameter, comprise in the situation of zero-sequence current, the second processor judges that whether zero-sequence current is zero, and is in zero the situation, to send the signal that there is earth fault in overhead transmission line at zero-sequence current.
According to above-described embodiment of the present utility model, converter 30 can comprise: sampling apparatus, be electrically connected with harvester 10 foundation, and be used for that the current signal that collects is carried out synchronized sampling according to predetermined sampling frequency and process, to obtain discrete signal; The second counter connects with sampling apparatus, is used for discrete signal is carried out 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 be used for the current signal of three drainage threads is carried out time synchronizing, with the current signal of acquisition time after synchronously; Four-processor is connected with the 3rd processor, is used for the current signal after the time synchronized is carried out sampling processing, to obtain discrete signal.
Particularly, the current signal of three drainage threads that the 3rd processor will get access to carries out time synchronizing, and with the current signal of acquisition time after synchronously, 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 and calculate.By the precise time synchronized algorithm of the 3rd processor, guarantee the three-phase current sampling can be accurately, synchronously finish.
According to above-described embodiment of the present utility model, collector can comprise: one or more fault detectors, set up electrical connection with corresponding drainage thread, and be used for gathering the current signal of this drainage thread; Solar panel 101 connects with fault detector, is used for the sun power that receives is converted into electric energy, and provides electric energy to fault detector.Wherein, fault detector, daytime the board turning indication fault, night the flashing light indication fault; If the use wireless handheld terminal can also be preserved the historical record of fault.
Collector can also comprise: one or more fault detectors, set up electrical connection with corresponding drainage thread, and be used for gathering the current signal of this drainage thread; Mutual inductor is connected between the drainage thread of fault detector and correspondence, is used 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, cooperates the circuit design of little power consumption, and fault detector can be worked greater than 10A at line current.And, built-in super capacitor or boosting battery in fault detector (can be used for the indication at night), can reach more than 8 years serviceable life.Wherein, as shown in Figure 2 automatic electricity getting coil 103 connects with corresponding drainage thread.
In above-described embodiment of the application, converter 30 can also comprise: deriving means 301, connect with harvester 10, and be used for obtaining the current signal of three drainage threads that harvester 10 collects.
Particularly, as shown in Figure 2, deriving means 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 the micro power radio communication chip, three fault detector automatic network-buildings, and automatic time reaches the transmission of data synchronously.
In above-described embodiment of the application, converter 30 can comprise analog to digital converter.
The utility model 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 utility model, by at overhead transmission line device pick-up unit, pick-up unit can the Real-time Collection overhead transmission line the current signal of three drainage threads, and the current signal that collects carries out synchronized sampling, then the digital signal after the sampling being carried out signal processes, obtain the zero-sequence current parameter, fault detector solved in the prior art owing to can not be measured the zero-sequence current of overhead transmission line, and effective detection of ground faults, thereby cause the repair personnel can not locate fast the problem of trouble spot, realize the zero-sequence current of Measurement accuracy overhead transmission line, thereby accurately detected the effect whether overhead transmission line exists earth fault.
Fig. 3 is the detailed construction synoptic diagram according to detection system of the present utility model.As shown in Figure 3, label 90 is main transformer, 110 is isolating switch, label 130 is bus, earth fault among Fig. 3 (being earth point) between P3 pick-up unit and P4 pick-up unit, C phase ground connection, the circuit zero sequence current ratio of passing through so P1 pick-up unit and P3 pick-up unit is larger, and very little through the zero-sequence current of P2 pick-up unit and P4 pick-up unit circuit, just can judge whether exactly ground connection by size or the Sudden Changing Rate of measuring zero-sequence current.When overhead transmission line is detected 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, singlephase earth fault when occuring in the pole line small resistance grounding system, and zero-sequence current is larger, usually 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 utility model has been realized following technique effect: by at overhead transmission line device pick-up unit, pick-up unit can the Real-time Collection overhead transmission line the current signal of three drainage threads, and the current signal that collects carries out synchronized sampling, then the digital signal after the sampling being carried out signal processes, obtain the zero-sequence current parameter, fault detector solved in the prior art owing to can not be measured the zero-sequence current of overhead transmission line, and effective detection of ground faults, thereby cause the repair personnel can not locate fast the problem of trouble spot, realize the zero-sequence current of Measurement accuracy overhead transmission line, thereby accurately detected the effect whether overhead transmission line exists earth fault.Use Apparatus and system of the present utility model, can realize the automatic decision function to overhead transmission line phase fault and singlephase earth fault interval, make power supply department can find fast the line fault point, increase work efficiency, shorten the accident maintenance time.
The above is preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (9)
1. the pick-up unit of an overhead transmission line earth fault is characterized in that, comprising:
Harvester comprises three collectors, respectively with overhead transmission line in three drainage threads set up and be electrically connected, for the current signal of three described drainage threads that gather described overhead transmission line;
Converter is electrically connected with described harvester, carries out synchronized sampling for the current signal to three described drainage threads and processes to obtain corresponding with it digital signal;
Controller is connected with described converter, is used for described digital signal is carried out Fourier transform to obtain zero-sequence current.
2. device according to claim 1 is characterized in that, described controller comprises:
The first counter connects with described converter, is used for described digital signal is carried out Fourier transform, to obtain one or more conversion parameters;
First processor connects with described the first counter, whether comprises described zero-sequence current for detection of described conversion parameter;
The second processor is connected with described first processor, is used for comprising in the situation of described zero-sequence current at described conversion parameter, judges whether described zero-sequence current is zero;
Output unit is connected with described the second processor, is used for sending the signal that there is earth fault in described overhead transmission line under described zero-sequence current is the situation of non-zero.
3. device according to claim 2 is characterized in that, described converter comprises:
Sampling apparatus is electrically connected with described harvester foundation, is used for that the described current signal that collects is carried out synchronized sampling according to predetermined sampling frequency and processes, to obtain discrete signal;
The second counter connects with described sampling apparatus, is used for described discrete signal is carried out 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, is used for the current signal of three described drainage threads is carried out time synchronizing, with the current signal of acquisition time after synchronously;
Four-processor is connected with described the 3rd processor, is used for the current signal after the described time synchronized is carried out sampling processing, to obtain described discrete signal.
5. device according to claim 4 is characterized in that, described collector comprises:
One or more fault detectors are set up electrical connection with corresponding described drainage thread, are used for gathering the current signal of this drainage thread;
Solar panel connects with described fault detector, is used for the sun power that receives 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 comprises:
One or more fault detectors are set up electrical connection with corresponding described drainage thread, are used for gathering the current signal of this drainage thread;
Mutual inductor is connected between the described drainage thread of described fault detector and correspondence, is used for obtaining electric energy from this drainage thread, and provides described electric energy to described fault detector.
7. according to claim 5 or 6 described devices, it is characterized in that described converter also comprises:
Deriving means connects with described harvester, is used 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. the detection system of an overhead transmission line earth fault is characterized in that, comprising:
At least one overhead transmission line, every described overhead transmission line comprises each described pick-up unit in the claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220453850.3U CN202929145U (en) | 2012-09-06 | 2012-09-06 | Device and system for aerial line grounding fault detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220453850.3U CN202929145U (en) | 2012-09-06 | 2012-09-06 | Device and system for aerial line grounding fault detection |
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| CN202929145U true CN202929145U (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201220453850.3U Expired - Lifetime CN202929145U (en) | 2012-09-06 | 2012-09-06 | Device and system for aerial line grounding fault detection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104007306A (en) * | 2014-04-21 | 2014-08-27 | 天津电力设计院 | Method for obtaining OPGW total current generated when overhead transmission line is in unbalanced short circuit |
| CN106646126A (en) * | 2016-12-09 | 2017-05-10 | 国网北京市电力公司 | Method, device and system for locating fault |
-
2012
- 2012-09-06 CN CN201220453850.3U patent/CN202929145U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104007306A (en) * | 2014-04-21 | 2014-08-27 | 天津电力设计院 | Method for obtaining OPGW total current generated when overhead transmission line is in unbalanced short circuit |
| CN104007306B (en) * | 2014-04-21 | 2017-09-05 | 天津电力设计院 | OPGW lines circuital method when obtaining overhead transmission line unsymmetrical short-circuit |
| CN106646126A (en) * | 2016-12-09 | 2017-05-10 | 国网北京市电力公司 | Method, device and system for locating fault |
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