CN103675569B - The detection Apparatus and system of aerial line ground fault - Google Patents
The detection Apparatus and system of aerial line ground fault Download PDFInfo
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- CN103675569B CN103675569B CN201210328790.7A CN201210328790A CN103675569B CN 103675569 B CN103675569 B CN 103675569B CN 201210328790 A CN201210328790 A CN 201210328790A CN 103675569 B CN103675569 B CN 103675569B
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- 238000006243 chemical reaction Methods 0.000 claims description 13
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Abstract
The present invention discloses the detection Apparatus and system of a kind of aerial line ground fault. Wherein, this detection device comprises: gathering device, comprises three collectors, sets up with three drainage lines in aerial line respectively and is electrically connected, for gathering the electric current signal of three drainage lines of aerial line; Transmodulator, is electrically connected with gathering device, processes for the electric current signal of three drainage lines carries out synchronized sampling to obtain the numerary signal corresponded; Controller, is connected with transmodulator, for numerary signal carrying out Fourier transform to obtain zero sequence electric current, and when zero sequence electric current is non-zero, sends the signal that aerial line exists ground fault. By the detection Apparatus and system of the present invention, it is achieved that the zero sequence electric current of Measurement accuracy aerial line, thus accurately detect the effect whether aerial line exists ground fault.
Description
Technical field
The present invention relates to power domain, specifically, it relates to the detection Apparatus and system of a kind of aerial line ground fault.
Background technology
Due to the geographical wide range that power supply aerial line relates to, for ensureing that electric power first-aid personnel can find the trouble spot of circuit fast when aerial line generation fault, shorten emergency repair time, along aerial line, aerial conductor fault indicator is generally installed. Being directly installed on three-phase line by aerial conductor fault indicator respectively, the aerial conductor fault indicator on three-phase independently works separately, can only detect single-phase current, generally cannot distinguish load electric current and fault current. When indicating phase fault, identical with cable type telltale principle of work, it is possible to adopt current ration mode or current break mode. But when indicating ground fault, owing to aerial conductor fault indicator cannot detect zero sequence electric current under normal circumstances, so ground fault cannot be judged by detecting the method for zero sequence electric current.
For small current neutral grounding system, when circuit generation single-phase earthing fault, it is single-phase to vagabond current that the transient current that trouble spot is flow through generally can be greater than when electrical network normally runs, and has a mutation process, and harmonic current increases simultaneously, especially five subharmonic. By judging the phase place of the first half-wave of ground connection transient current, size or five subharmonic, single-phase earthing fault just can be judged to a certain extent, but this kind of method accuracy is not high, especially for the system of extinguishing arc coil ground connection. And for aerial conductor fault indicator, because zero sequence electric current cannot be measured, it is very difficult to isolate grounding current among single-phase current, just more cannot judge single-phase earthing fault.
For in prior art owing to trouble indicator can not measure the zero sequence electric current of aerial line, and can not effective detection of ground faults, thus cause repair personnel can not the problem of quick position trouble spot, effective solution is not yet proposed at present.
Summary of the invention
For correlation technique owing to trouble indicator can not measure the zero sequence electric current of aerial line, and can not effective detection of ground faults, thus cause the repair personnel can not the problem of quick position trouble spot, at present effective solution is not yet proposed, for this reason, the main purpose of the present invention is to provide the detection Apparatus and system of a kind of aerial line ground fault, to solve the problem.
In order to realize above-mentioned purpose, according to an aspect of the present invention, provide the detection device of a kind of aerial line ground fault, this device comprises: gathering device, comprise three collectors, set up with three drainage lines in aerial line respectively and it is electrically connected, for gathering the electric current signal of three drainage lines of aerial line; Transmodulator, is electrically connected with gathering device, processes for the electric current signal of three drainage lines carries out synchronized sampling to obtain the numerary signal corresponded; Controller, is connected with transmodulator, for numerary signal carrying out Fourier transform to obtain zero sequence electric current, and when zero sequence electric current is non-zero, sends the signal that aerial line exists ground fault.
Further, controller comprises: the first counter, connects with transmodulator, for numerary signal is carried out Fourier transform, to obtain one or more conversion parameter; First treater, connects with the first counter, for detecting whether conversion parameter comprises zero sequence electric current; 2nd treater, is connected with the first treater, for when changing parameter and comprise zero sequence electric current, judging whether zero sequence electric current is zero; Take-off equipment, is connected with the 2nd treater, for sending the signal that aerial line exists ground fault when zero sequence electric current is non-zero.
Further, transmodulator comprises: sampling apparatus, sets up with gathering device and is electrically connected, for the electric current signal collected is carried out synchronized sampling process according to predetermined sampling frequency, to obtain discrete signal; 2nd counter, connects with sampling apparatus, for discrete signal is carried out vector computing, to obtain numerary signal.
Further, sampling apparatus comprises: the 3rd treater, is connected with gathering device, for the electric current signal of three drainage lines is carried out time synchronizing, to obtain the electric current signal after time lock; Four-processor, is connected with the 3rd treater, for the electric current signal after time lock is carried out sampling processing, to obtain discrete signal.
Further, collector comprises: one or more trouble indicator, sets up electrical connection with corresponding drainage line, for gathering the electric current signal of this drainage line; Solar panel, connects with trouble indicator, for the sun power received is converted into electric energy, and provides electric energy to trouble indicator.
Further, collector also comprises: one or more trouble indicator, sets up electrical connection with corresponding drainage line, for gathering the electric current signal of this drainage line; Mutual inductance coil, is connected between the drainage line of trouble indicator and correspondence, for obtaining electric energy from this drainage line, and provides electric energy to trouble indicator.
Further, transmodulator also comprises: acquisition device, connects with gathering device, for obtaining the electric current signal of three drainage lines that gathering device collects.
Further, transmodulator comprises analog to digital converter.
In order to realize above-mentioned purpose, according to another aspect of the present invention, it provides the detection system of a kind of aerial line ground fault, this system comprises: at least one aerial line, and every bar aerial line comprises detection device.
By the detection Apparatus and system of aerial line ground fault of the present invention, the collector of employing detection device can measure the electric current of three drainage lines of aerial line in real time, the electric current signal collected is carried out synchronized sampling by transmodulator, then controller and to sampling after numerary signal carry out signal processing, obtain zero sequence current parameters, trouble indicator solves in prior art owing to can not measure the zero sequence electric current of aerial line, and can not effective detection of ground faults, thus cause the repair personnel can not the problem of quick position trouble spot, achieve the zero sequence electric current of Measurement accuracy aerial line, thus accurately detect the effect whether aerial line exists ground fault.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the part of the application, and the schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention. In the accompanying drawings:
Fig. 1 is the structural representation of detection device according to embodiments of the present invention;
Fig. 2 is the scheme of installation of detection device according to embodiments of the present invention; And
Fig. 3 is the detailed construction schematic diagram of the detection system according to the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually. Below with reference to the accompanying drawings and come the present invention is described in detail in conjunction with the embodiments.
Fig. 1 is the structural representation of detection device according to embodiments of the present invention. Fig. 2 is the scheme of installation of detection device according to embodiments of the present invention. As depicted in figs. 1 and 2, this device can comprise: gathering device 10, comprises three collectors, is electrically connected with three drainage lines in aerial line respectively, for gathering the electric current signal of three drainage lines of aerial line; Transmodulator 30, is electrically connected with gathering device 10, processes for the electric current signal of three drainage lines carries out synchronized sampling to obtain the numerary signal corresponded; Controller 50, is connected with transmodulator 30, for numerary signal carrying out Fourier transform to obtain zero sequence electric current, and when zero sequence electric current is non-zero, sends the signal that aerial line exists ground fault.
Adopt the detection device of the aerial line ground fault of the application, it is electrically connected by three collectors in gathering device are set up with three drainage lines in aerial line respectively, gather the electric current signal of three drainage lines of aerial line, then the electric current signal of three drainage lines is carried out synchronized sampling process by transmodulator, to obtain the numerary signal corresponded, the numerary signal got is carried out Fourier transform by last controller, to obtain with individual or multiple conversion parameter, wherein, zero sequence electric current is comprised in conversion parameter, and when zero sequence electric current is non-zero, controller sends the signal that aerial line exists ground fault. but in the prior art, owing to trouble indicator is arranged separately on circuit, work independently, and the consideration for insulation, again can not between three independent trouble indicators connection signal line, thus cannot measure zero sequence electric current by trouble indicator, thus single-phase earthing fault cannot be judged. the detection device of the application, the electric current of three drainage lines of aerial line can be measured in real time by collector, the electric current signal collected is carried out synchronized sampling by transmodulator, then controller and to sampling after numerary signal carry out signal processing, obtain zero sequence current parameters, trouble indicator solves in prior art owing to can not measure the zero sequence electric current of aerial line, and can not effective detection of ground faults, thus cause the repair personnel can not the problem of quick position trouble spot, achieve the zero sequence electric current of Measurement accuracy aerial line, thus accurately detect the effect whether aerial line exists ground fault.
Wherein, three drainage lines of aerial line can be the three-phase of a transmitting line, is respectively A phase, B phase and C phase, as shown in Figure 2, is arranged on aerial line by gathering device 10, transmodulator 30 and controller 50 is arranged on support bar. Specifically, three collectors are set to the real-time current signal that a group gathers A phase, B phase and C phase respectively, then by transmodulator 30, the three-phase current signal collected is carried out synchronized sampling process, get corresponding numerary signal, then numerary signal is carried out Fourier transform, calculate the conversion parameter comprising positive sequence component, negative phase-sequence component, zero sequence electric current and harmonic component, these conversion parameters are processed by controller 50 afterwards, zero sequence electric current in these parameters is non-zero, there is ground fault in this aerial line. Wherein, support bar can be electric pole, and transmodulator 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 transmodulator 30, for numerary signal is carried out Fourier transform, to obtain one or more conversion parameter; First treater, connects with the first counter, for detecting whether conversion parameter comprises zero sequence electric current; 2nd treater, is connected with the first treater, for when changing parameter and comprise zero sequence electric current, judging whether zero sequence electric current is zero; Take-off equipment, is connected with the 2nd treater, for sending the signal that aerial line exists ground fault when zero sequence electric current is non-zero.
Specifically, the numerary signal that first counter obtains after transmodulator 30 processes carries out Fourier transform, to obtain the conversion parameter comprising positive sequence component, negative phase-sequence component, zero sequence electric current and harmonic component, then whether the first treater detection conversion parameter comprises zero sequence electric current, when changing parameter and comprise zero sequence electric current, 2nd treater judges whether zero sequence electric current is zero, and when zero sequence electric current is zero, sends the signal that aerial line exists ground fault.
According to the abovementioned embodiments of the present invention, transmodulator 30 can comprise: sampling apparatus, sets up with gathering device 10 and is electrically connected, for the electric current signal collected is carried out synchronized sampling process according to predetermined sampling frequency, to obtain discrete signal; 2nd counter, connects with sampling apparatus, for discrete signal is carried out vector computing, to obtain numerary signal.
Above-described embodiment according to the application, sampling apparatus can comprise: the 3rd treater, is connected with gathering device 10, for the electric current signal of three drainage lines is carried out time synchronizing, to obtain the electric current signal after time lock; Four-processor, is connected with the 3rd treater, for the electric current signal after time lock is carried out sampling processing, to obtain discrete signal.
Specifically, the electric current signal of the three bars of drainage lines got is carried out time synchronizing by the 3rd treater, and to obtain the electric current signal after time lock, then the electric current signal after time lock is sampled by four-processor, obtains discrete signal. Wherein, time lock precision generally can reach 50 microseconds, and each periodic sampling each periodic sampling 64 points carry out FFT calculating. By the accurate time lock algorithm of the 3rd treater, ensure that tri-phase current sampling can accurately, synchronously complete.
According to the abovementioned embodiments of the present invention, collector can comprise: one or more trouble indicator, sets up electrical connection with corresponding drainage line, for gathering the electric current signal of this drainage line; Solar panel, connects with trouble indicator, for the sun power received is converted into electric energy, and provides electric energy to trouble indicator. Wherein, trouble indicator, turns over board indication fault daytime, dodges lamp indication fault night; If use wireless handheld terminal, it is also possible to preserve the historic records of fault.
Collector can also comprise: one or more trouble indicator, sets up electrical connection with corresponding drainage line, for gathering the electric current signal of this drainage line; Mutual inductance coil, is connected between the drainage line of trouble indicator and correspondence, for obtaining electric energy from this drainage line, and provides electric energy to trouble indicator. Wherein, mutual inductance coil adopts the iron core of high permeability, coordinates the circuit layout of Micro Energy Lose, makes trouble indicator be greater than 10A at line current and get final product normal operation. Further, built-in super capacitor or boosting battery (may be used for instruction at night) in trouble indicator, it may also be useful to the life-span can reach more than 8 years.
In above-described embodiment of the application, transmodulator 30 can also comprise: acquisition device, connects with gathering device 10, for obtaining the electric current signal of three drainage lines that gathering device 10 collects.
Specifically, as shown in Figure 2, acquisition device can adopt short-distance wireless communication technology, it is achieved the cableless communication of gathering device 10 and transmodulator 30. Wherein, cableless communication technology can adopt Bluetooth technology, adopts micro power radio communication chip, three trouble indicator automatic network-buildings, and automatic time is synchronous and transmits data.
In above-described embodiment of the application, transmodulator 30 can comprise analog to digital converter.
This application provides the detection system of a kind of aerial line ground fault, this system can comprise: at least one aerial line, and every bar aerial line can comprise detection device.
Adopt the detection system of the aerial line ground fault of the present invention, device is detected by device on aerial line, detection device can gather the electric current signal of three drainage lines of aerial line in real time, and the electric current signal collected carries out synchronized sampling, then the numerary signal after sampling is carried out signal processing, obtain zero sequence current parameters, trouble indicator solves in prior art owing to can not measure the zero sequence electric current of aerial line, and can not effective detection of ground faults, thus cause the repair personnel can not the problem of quick position trouble spot, achieve the zero sequence electric current of Measurement accuracy aerial line, thus accurately detect the effect whether aerial line exists ground fault.
Fig. 3 is the detailed construction schematic diagram of the detection system according to the present invention. As shown in Figure 3, earth fault detects between device at P3 and P4, C phase ground connection, so circuit zero sequence current ratio through P1 and P3 telltale is bigger, and very little through the zero sequence electric current of P2 and P4 telltale circuit, just can accurately judge whether ground connection by the size or sudden change amount measuring zero sequence electric current. When aerial line is detected short trouble, except needs detect tri-phase current, also to be come the position of failure judgement point in conjunction with the size with zero sequence electric current. Specifically, when there is single-phase earthing fault in pole line low resistance grounding system, zero sequence electric current is relatively big, usually between 100A-1000A, much larger than capacitive current, as long as therefore can accurately measure zero sequence electric current, so that it may accurately to judge single-phase earthing fault.
From above description, can find out, present invention achieves following technique effect: detect device by device on aerial line, detection device can gather the electric current signal of three drainage lines of aerial line in real time, and the electric current signal collected carries out synchronized sampling, then the numerary signal after sampling is carried out signal processing, obtain zero sequence current parameters, trouble indicator solves in prior art owing to can not measure the zero sequence electric current of aerial line, and can not effective detection of ground faults, thus cause the repair personnel can not the problem of quick position trouble spot, achieve the zero sequence electric current of Measurement accuracy aerial line, thus accurately detect the effect whether aerial line exists ground fault. use the Apparatus and system of the application, it is possible to realize the automatic decision function of the alternate short circuit of aerial line and single-phase earthing fault interval, enable power supply department find line fault point fast, it is to increase working efficiency, shortening accident emergency repair time.
Obviously, the technician of this area should be understood that, each module of above-mentioned the present invention or each step can realize with general calculating device, they can concentrate on single calculating device, or it is distributed on network that multiple calculating device forms, can selection of land, they can realize with the program code that calculating device can perform, thus, they can be stored and perform by calculating device in the storage device, or they are made into respectively each integrated circuit modules, or the multiple module in them or step are made into single integrated circuit module realize. like this, the present invention does not limit and combines in any specific hardware and software.
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 amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the detection device of an aerial line ground fault, it is characterised in that, comprising:
Gathering device, comprises three collectors, sets up with three drainage lines in aerial line respectively and is electrically connected, for the electric current signal of the described drainage line that gathers three of described aerial line;
Transmodulator, is electrically connected with described gathering device, processes for the electric current signal of three described drainage lines carries out synchronized sampling to obtain the numerary signal corresponded;
Controller, is connected with described transmodulator, for described numerary signal carrying out Fourier transform to obtain zero sequence electric current, and when described zero sequence electric current is non-zero, sends the signal that described aerial line exists ground fault;
Wherein, described controller comprises: the first counter, connects with described transmodulator, for described numerary signal is carried out Fourier transform, to obtain one or more conversion parameter; First treater, connects with described first counter, for detecting whether described conversion parameter comprises described zero sequence electric current; 2nd treater, is connected with described first treater, for when described conversion parameter comprises described zero sequence electric current, judging whether described zero sequence electric current is zero; Take-off equipment, is connected with described 2nd treater, for sending the signal that described aerial line exists ground fault when described zero sequence electric current is non-zero.
2. device according to claim 1, it is characterised in that, described transmodulator comprises:
Sampling apparatus, sets up with described gathering device and is electrically connected, for the described electric current signal collected is carried out synchronized sampling process according to predetermined sampling frequency, to obtain discrete signal;
2nd counter, connects with described sampling apparatus, for described discrete signal is carried out vector computing, to obtain described numerary signal.
3. device according to claim 2, it is characterised in that, described sampling apparatus comprises:
3rd treater, is connected with described gathering device, for the electric current signal of three described drainage lines is carried out time synchronizing, to obtain the electric current signal after time lock;
Four-processor, is connected with described 3rd treater, for the electric current signal after described time lock is carried out sampling processing, to obtain described discrete signal.
4. device according to claim 3, it is characterised in that, described collector comprises:
One or more trouble indicator, sets up electrical connection with corresponding described drainage line, for gathering the electric current signal of this drainage line;
Solar panel, connects with described trouble indicator, for the sun power received is converted into electric energy, and provides described electric energy to described trouble indicator.
5. device according to claim 3, it is characterised in that, described collector also comprises:
One or more trouble indicator, sets up electrical connection with corresponding described drainage line, for gathering the electric current signal of this drainage line;
Mutual inductance coil, is connected between described trouble indicator and the described drainage line of correspondence, for obtaining electric energy from this drainage line, and provides described electric energy to described trouble indicator.
6. device according to claim 4 or 5, it is characterised in that, described transmodulator also comprises:
Acquisition device, connects with described gathering device, for obtaining the electric current signal of three described drainage lines that described gathering device collects.
7. device according to claim 6, it is characterised in that, described transmodulator comprises analog to digital converter.
8. the detection system of an aerial line ground fault, it is characterised in that, comprising:
At least one aerial line, aerial line described in every bar comprises the detection device according to any one of claim 1 to 7.
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| CN104391226B (en) * | 2014-11-28 | 2018-01-16 | 国家电网公司 | A kind of distribution line for supporting three-phase synchronous to gather on-line monitoring acquisition terminal and acquisition method |
| CN106646126A (en) * | 2016-12-09 | 2017-05-10 | 国网北京市电力公司 | Method, device and system for locating fault |
| 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 |
| 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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| 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 |
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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2765935B2 (en) * | 1989-04-07 | 1998-06-18 | 株式会社日立製作所 | switchboard |
| EP2290775A1 (en) * | 2009-08-31 | 2011-03-02 | ABB Research Ltd. | A method of fault phase selection and fault type determination |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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