CN102520312A - Low-current single-phase earth fault line selection and localization device - Google Patents
Low-current single-phase earth fault line selection and localization device Download PDFInfo
- Publication number
- CN102520312A CN102520312A CN2011103406418A CN201110340641A CN102520312A CN 102520312 A CN102520312 A CN 102520312A CN 2011103406418 A CN2011103406418 A CN 2011103406418A CN 201110340641 A CN201110340641 A CN 201110340641A CN 102520312 A CN102520312 A CN 102520312A
- Authority
- CN
- China
- Prior art keywords
- bus
- earth fault
- small echo
- fault
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention provides a low-current single-phase earth fault line selection and localization device. The device comprises a host, a bus PT and at least one set of sensors, wherein the bus PT is used for collecting bus three-phase voltages of a power distribution network system. Each of the sensors includes a bus outlet sensor, three branch sensors and a wireless sending unit; the bus outlet sensor and the three branch sensors are respectively connected with the wireless sending unit. The host comprises an operation control unit, an earth fault monitoring circuit, a wavelet signal emitter and a wireless receiving unit, wherein the earth fault monitoring circuit, the wavelet signal emitter and the wireless receiving unit are respectively connected with the operation control unit; the earth fault monitoring circuit is connected with the bus PT; the wavelet signal emitter is connected with a neutral point of the bus PT; and the operation control unit and the sensors carry out wireless communication. According to the invention, trouble of manually searching of a fault point along a line according to a previous method can be saved; and the device has advantages of accurate fault determination, high line selection accuracy and rapid fault localization.
Description
Technical field
The present invention relates to distribution network failure monitoring field, specifically, related to a kind of little current single-phase grounding and locating device.
Background technology
Behind the controller switching equipment generation singlephase earth fault, possibly produce intermittent arc grounding, cause resonance overvoltage, produce several times to the superpotential of normal voltage, superpotential will further make the insulator dielectric on the circuit puncture, and cause serious short circuit accident; Serious singlephase earth fault, may the destroyed area network system stable, cause bigger accident.
At present, l0 kv power distribution network is owing to environment, equipment and user's influence, and failure-frequency is higher relatively always, and because the complicacy of distribution network involves a wide range of knowledge, also just compares difficulty for searching of fault.Along with the user improves constantly what good service and power supply reliability required, how to search fault coverage quickly and accurately, the isolated fault point recovers the major issue that the power supply of non-fault coverage has become distribution to solve.And singlephase earth fault accounts for more than 80% of whole failure-frequency in the distribution network systems; For this reason for the route selection and the location of single-phase fault; Select ground path exactly; Search the section that single-phase earthing takes place, can avoid, further strengthen the continuity of power supply non-faulty section circuit unnecessary power failure and operation.
Yet the searching work of traditional singlephase earth fault mainly is to rely on manual work to search the trouble spot, and work efficiency is very low, but also has increased staff's labour intensity.
In order to solve the problem of above existence, people are seeking a kind of desirable technical solution always.
Summary of the invention
The objective of the invention is the deficiency to prior art, thus provide a kind of design science, fault judgement precisely, route selection accuracy rate height and rapidly little current single-phase grounding of localization of fault and locating device.
To achieve these goals, the technical scheme that the present invention adopted is: a kind of little current single-phase grounding and locating device, and it comprises main frame, is used to gather bus PT and at least one group of sensor of distribution network system bus three-phase voltage;
Wherein, Said sensor comprises that the bus of the small echo electromagnetic signal that is used to gather distribution network system bus outlet goes out line sensor, three branch's sensor and wireless transmission unit that are used to gather the small echo electromagnetic signal on the branch phase conductors, and said bus goes out line sensor, three said branch sensors connect said wireless transmission unit respectively;
Said main frame comprises Operations Analysis, earth fault observation circuit, small echo signal projector and radio receiving unit; Whether normally said earth fault observation circuit is connected with said bus PT so that produce three-phase voltage monitor signal according to distribution network system bus three-phase voltage; Whether normal said Operations Analysis connect said earth fault observation circuit and whether have the judgment signal of earth fault and carry out bus-bar fault and differentiate mutually so that produce according to three-phase voltage monitor signal; Said Operations Analysis connects said small echo signal projector so that control the startup of said small echo signal projector according to the judgment signal that whether has earth fault, and the neutral point that said small echo signal projector connects said bus PT is used for injecting the small echo signal through said bus PT to distribution network system;
Said Operations Analysis and said sensor carry out wireless telecommunications through said wireless transmission unit and said radio receiving unit, so that confirm fault bus outlet and fault branch phase line according to the small echo electromagnetic signal.
The relative prior art of the present invention has outstanding substantive distinguishing features and marked improvement, and specifically, this little current single-phase grounding and locating device have the following advantages:
1, small echo signal injection method makes that electric network single-phase earth fault is differentiated accurately, the trouble spot is judged precisely.
2, radio call combines with the timing communication, makes the operations staff can grasp equipment running status at any time.
3, combine electronic chart, can command the repairing personnel to arrive the trouble spot, can effectively shorten the breakdown repair time through optimal path.
The present invention has overcome artificial in the past trouble of searching the trouble spot along the line, has saved staff's labour intensity greatly, has improved work efficiency for reducing the guarantee that provides of major power outage accident.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
Through embodiment, technical scheme of the present invention is done further detailed description below.
As shown in Figure 1, a kind of little current single-phase grounding and locating device, it comprises main frame, is used to gather the bus PT and the two sensors of distribution network system bus three-phase voltage;
Wherein, Said sensor comprises that the bus of the small echo electromagnetic signal that is used to gather distribution network system bus outlet goes out line sensor 11, three and is used to gather the branch's sensor 12 and the wireless transmission unit of the small echo electromagnetic signal on the branch phase conductors, and said bus goes out line sensor 11, three said branch sensors 12 connect said wireless transmission unit respectively;
Said main frame comprises Operations Analysis, earth fault observation circuit, small echo signal projector and radio receiving unit; Whether normally said earth fault observation circuit is connected with said bus PT so that produce three-phase voltage monitor signal according to distribution network system bus three-phase voltage; Whether normal said Operations Analysis connect said earth fault observation circuit and whether have the judgment signal of earth fault and carry out bus-bar fault and differentiate mutually so that produce according to three-phase voltage monitor signal; Said Operations Analysis connects said small echo signal projector so that control the startup of said small echo signal projector according to the judgment signal that whether has earth fault, and the neutral point that said small echo signal projector connects said bus PT is used for injecting the small echo signal through said bus PT to distribution network system;
Said Operations Analysis and said sensor carry out wireless telecommunications through said wireless transmission unit and said radio receiving unit, so that confirm fault bus outlet and fault branch phase line according to the small echo electromagnetic signal.
During use; Whether normally said earth fault observation circuit produces three-phase voltage monitor signal through A, B, the C triple point voltage of said bus PT induction; Then this monitor signal is sent to said Operations Analysis; Said Operations Analysis carries out analyzing and processing to the monitor signal that sends over, and then judges whether identification exists singlephase earth fault and fault phase; When said Operations Analysis is judged the generation singlephase earth fault; Promptly to said small echo signal projector transmitting control commands; Start said small echo signal projector, said small echo signal projector injects the small echo signal through neutral point N, the L of bus PT to distribution network system, and the medium and small ripple signal of fault phase circuit this moment forms the closed-loop path; Then form forceful electric power magnetic signal; The said bus at trouble spot place has said branch sensor 12 that line sensor 11 and fault belong to mutually the electromagnetic signal of induction is sent to said radio receiving unit through said wireless transmission unit, the small echo electromagnetic signal that said radio receiving unit receives sensor acquisition through signal Processing such as frequency-selecting amplification, filtering, comprehensive amplifications after, the small echo electromagnetic signal after will handling again sends to said Operations Analysis; Analyzing and processing through said Operations Analysis; Can confirm fault bus outlet and fault branch phase line, and then show that the repairing personnel are according to testing result and orientation that electronic chart showed through the electronic chart that combines with it; Just can arrive at fault in-situ apace, effectively shorten the time of breakdown repair.
Device, just can react rapidly in case singlephase earth fault takes place at run duration, detects guilty culprit; Said Operations Analysis and said bus go out regularly communication between line sensor 11 and three the said branch sensors 12, make the operations staff can grasp equipment running at any time.
Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although with reference to preferred embodiment the present invention has been carried out detailed explanation, the those of ordinary skill in affiliated field is to be understood that: still can specific embodiments of the invention make amendment or the part technical characterictic is equal to replacement; And not breaking away from the spirit of technical scheme of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (1)
1. little current single-phase grounding and locating device, it is characterized in that: it comprises main frame, is used to gather bus PT and at least one group of sensor of distribution network system bus three-phase voltage;
Wherein, Said sensor comprises that the bus of the small echo electromagnetic signal that is used to gather distribution network system bus outlet goes out line sensor, three branch's sensor and wireless transmission unit that are used to gather the small echo electromagnetic signal on the branch phase conductors, and said bus goes out line sensor, three said branch sensors connect said wireless transmission unit respectively;
Said main frame comprises Operations Analysis, earth fault observation circuit, small echo signal projector and radio receiving unit; Whether normally said earth fault observation circuit is connected with said bus PT so that produce three-phase voltage monitor signal according to distribution network system bus three-phase voltage; Whether normal said Operations Analysis connect said earth fault observation circuit and whether have the judgment signal of earth fault and carry out bus-bar fault and differentiate mutually so that produce according to three-phase voltage monitor signal; Said Operations Analysis connects said small echo signal projector so that control the startup of said small echo signal projector according to the judgment signal that whether has earth fault, and the neutral point that said small echo signal projector connects said bus PT is used for injecting the small echo signal through said bus PT to distribution network system;
Said Operations Analysis and said sensor carry out wireless telecommunications through said wireless transmission unit and said radio receiving unit, so that confirm fault bus outlet and fault branch phase line according to the small echo electromagnetic signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103406418A CN102520312A (en) | 2011-11-02 | 2011-11-02 | Low-current single-phase earth fault line selection and localization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103406418A CN102520312A (en) | 2011-11-02 | 2011-11-02 | Low-current single-phase earth fault line selection and localization device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102520312A true CN102520312A (en) | 2012-06-27 |
Family
ID=46291298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103406418A Pending CN102520312A (en) | 2011-11-02 | 2011-11-02 | Low-current single-phase earth fault line selection and localization device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102520312A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558511A (en) * | 2013-11-18 | 2014-02-05 | 国家电网公司 | Online earth fault positioning system for power distribution network |
| CN105093068A (en) * | 2015-08-31 | 2015-11-25 | 国家电网公司 | Undercurrent single-phase earth fault line selection and positioning apparatus |
| CN105137285A (en) * | 2015-08-28 | 2015-12-09 | 广东中钰科技股份有限公司 | Power distribution network grounding fault line selection method and system |
| WO2019075673A1 (en) * | 2017-10-18 | 2019-04-25 | 中国电力科学研究院有限公司 | Single-phase-to-ground fault detection method and device based on electric field induction, and storage medium |
| CN110850229A (en) * | 2019-11-06 | 2020-02-28 | 天津大学 | Power distribution network single-phase earth fault line selection method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11281700A (en) * | 1998-03-27 | 1999-10-15 | Ngk Insulators Ltd | Device for detecting portable distribution-line fault |
| CN201788253U (en) * | 2010-08-19 | 2011-04-06 | 河南省电力公司郑州供电公司 | Fault location system for distribution lines |
| CN202362415U (en) * | 2011-11-02 | 2012-08-01 | 河南省电力公司信阳供电公司 | Low current single-phase grounding fault route selection and positioning device |
-
2011
- 2011-11-02 CN CN2011103406418A patent/CN102520312A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11281700A (en) * | 1998-03-27 | 1999-10-15 | Ngk Insulators Ltd | Device for detecting portable distribution-line fault |
| CN201788253U (en) * | 2010-08-19 | 2011-04-06 | 河南省电力公司郑州供电公司 | Fault location system for distribution lines |
| CN202362415U (en) * | 2011-11-02 | 2012-08-01 | 河南省电力公司信阳供电公司 | Low current single-phase grounding fault route selection and positioning device |
Non-Patent Citations (2)
| Title |
|---|
| 张慧芬等: "无线通信与注入信号法相结合的配电网单相接地自动定位", 《继电器》, vol. 36, no. 7, 1 April 2008 (2008-04-01) * |
| 邵建军: "小电流接地故障定位信号发生装置的研制", 《中国优秀硕士学位论文全文数据库 工程科技II辑》, no. 4, 15 April 2010 (2010-04-15) * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558511A (en) * | 2013-11-18 | 2014-02-05 | 国家电网公司 | Online earth fault positioning system for power distribution network |
| CN105137285A (en) * | 2015-08-28 | 2015-12-09 | 广东中钰科技股份有限公司 | Power distribution network grounding fault line selection method and system |
| CN105093068A (en) * | 2015-08-31 | 2015-11-25 | 国家电网公司 | Undercurrent single-phase earth fault line selection and positioning apparatus |
| WO2019075673A1 (en) * | 2017-10-18 | 2019-04-25 | 中国电力科学研究院有限公司 | Single-phase-to-ground fault detection method and device based on electric field induction, and storage medium |
| CN110850229A (en) * | 2019-11-06 | 2020-02-28 | 天津大学 | Power distribution network single-phase earth fault line selection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102937675B (en) | The method of work of Real-time Electrical Distribution Network Data collection and fault location system | |
| CN103336220B (en) | The method and apparatus of distribution network failure being monitored and locating | |
| CN104991162B (en) | A kind of positioning device and application method of single-phase grounded malfunction in grounded system of low current | |
| CN103513161B (en) | Electrical power trans mission/distribution system trouble shoot position indicator and lookup method | |
| CN102621451B (en) | Based on the distribution circuit single-phase earth fault detection method of momentary signal method | |
| CN102064537B (en) | Method for judging and processing single-phase earth faults by using electronic mutual inductor | |
| CN101017974A (en) | Single phase grounding failure positioning method and device of neutral point non direct grounding power grid | |
| CN102928741A (en) | Satellite time synchronization based electric power line fault location system and method | |
| CN104678260A (en) | System and method for single-phase grounding line selection of small current grounding system | |
| CN202854252U (en) | Real-time data acquisition and fault locating system of power distribution network | |
| CN102520312A (en) | Low-current single-phase earth fault line selection and localization device | |
| CN101505053B (en) | Power line protection method based on user boundary circuit breaker devices | |
| CN106370975A (en) | Power distribution automation system's single-phase grounding section precisely positioning method | |
| CN104090208A (en) | Voltage-type power distribution network fault processing method | |
| CN109884454A (en) | The intelligent pole-mounted circuit breaker of one or two fusions of one kind and cable monitoring system | |
| CN202870234U (en) | Online fault monitoring system for 10KV circuit | |
| CN102540009A (en) | Fault locating system of power distribution network | |
| CN104898018A (en) | Automatic pull trial detection and control device for single-phase earth fault of power distribution network | |
| CN106026053A (en) | Single phase earth fault positioning and isolating system and method based on low-excitation impedance transformer | |
| CN201051663Y (en) | Single phase ground failure location device for neutral point indirect ground power grid | |
| CN101907675B (en) | Method for finding out fault of distribution network circuit | |
| CN207440228U (en) | A kind of feeder line fault on-line monitoring system | |
| CN202362415U (en) | Low current single-phase grounding fault route selection and positioning device | |
| CN102749553A (en) | Automatic positioning device for grounding failure of power transmission line | |
| CN105807187A (en) | Single-phase ground-fault assist detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120627 |