CN101726692A - Single-phase ground fault positioning method for ground protective device of low-current system - Google Patents
Single-phase ground fault positioning method for ground protective device of low-current system Download PDFInfo
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- CN101726692A CN101726692A CN200910220718A CN200910220718A CN101726692A CN 101726692 A CN101726692 A CN 101726692A CN 200910220718 A CN200910220718 A CN 200910220718A CN 200910220718 A CN200910220718 A CN 200910220718A CN 101726692 A CN101726692 A CN 101726692A
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Abstract
The invention discloses a single-phase ground fault positioning method for a ground protective device of a low-current system, which does not affect the protective performance of the ground protective device and can quickly find out a ground fault point. The method comprises the following steps that: a microcomputer intelligent controller judges whether a system is grounded or has a grounded phase difference or not according to the changes of a system line, a phase voltage and a zero sequence voltage; and when a single-phase ground fault happens, the microcomputer intelligent controller sends a switching command to a grounded phase breaker. The method is characterized in that: after being switched on, the grounded phase breaker is connected with a grounding network through a low-impedance current limiting reactor with a secondary coil; at the time, a grounding current of the system flows through a primary coil of the low-impedance current limiting reactor, and after the current is detected, the microcomputer intelligent controller gets into work with a high frequency signal generator connected with the secondary coil of the low-impedance current limiting reactor to inject a high frequency current into the system; and a handheld high frequency signal receiver moves along a fault line for searching the fault point, and the corresponding point where the received signal gradually becomes weak when the handheld high frequency signal receiver departs from some point is the ground fault point.
Description
Technical field
The present invention relates to a kind of single-phase ground fault positioning method for ground protective device of low-current system.
Background technology
The small current system earth protective device makes the no arcing of singlephase earth fault point after the protection fast, causes earth fault not have vestige, and the tour personnel are the failure judgement point accurately.In order to address this problem, adopt voltage transformer (VT) to inject a high-frequency current signal at present to fault loop, move and the trouble spot is positioned along ground path with the hand-held high-frequency signal receiver then according to the power variation of the high-frequency signal that receives.This method is influenced by the low impedance shunt of earth protective device, and the component that the high-frequency current signal of injection is flow on the faulty line is faint, causes detection sensitivity extremely low, still can't accurately locate the trouble spot.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of earth protective device protective value that neither influences, and can search the single-phase ground fault positioning method for ground protective device of low-current system of earth fault fast again.
Technical solution of the present invention is:
A kind of single-phase ground fault positioning method for ground protective device of low-current system,
Have or not singlephase earth fault and ground connection separate by microcomputer-based intelligent controller real-time acquisition system line, phase voltage and residual voltage and according to system line, phase voltage and residual voltage judgement system, when taking place, singlephase earth fault provides the instruction of ground connection phase breaker closing, its special character is: link to each other with grounded screen by the Low ESR current limiting reactor that has secondary coil behind the ground connection phase breaker closing, realize multiple grounding, thereby shift trouble spot place's ground current and extinguish place, trouble spot ground arc; There is the system earth electric current to flow through on the primary winding of Low ESR current limiting reactor at this moment, the microcomputer-based intelligent controller detects by zero sequence current mutual inductor has the high-frequency voltage signal generator that will be connected with Low ESR current limiting reactor secondary coil behind the electric current to devote oneself to work to system's injection high-frequency voltage signal, produce high-frequency current in a HF voltage of Low ESR current limiting reactor primary winding side induction and the fault that acts directly on system on mutually, this electric current flows among system's capacitance to earth and the fault loop stake resistance; Move along faulty line by the hand-held high-frequency signal receiver and to carry out the trouble spot and search, when leave certain some back received signal that of correspondence when dying down gradually by force be earth fault.
Above-mentioned single-phase ground fault positioning method for ground protective device of low-current system, the frequency of described high-frequency voltage signal generator are 100～400Hz.
Advantage of the present invention is:
1, adopt the Low ESR current limiting reactor to inject the method for high-frequency signal to system fault loop; be not subjected to the shunt influence of earth protective device; use original hand-held high-frequency signal receiver still can position, do not influence the low-impedance protection function of earth protective device under power frequency simultaneously again the trouble spot.
2, adopt the Low ESR current limiting reactor that has secondary coil owing to inject signal, because of the capacity big manyfold of its equipment current-carrying capacity than the primary voltage mutual inductor, the component that the high-frequency current signal of injection is flow on the faulty line increases greatly, compares the sensitivity of locating in the time of can improving high resistance ground greatly with former method.
When 3, another mutually earth fault takes place when system, has the function of limiting short-circuit current again.
Description of drawings
Fig. 1 is a system schematic of the present invention.
Embodiment:
As shown in the figure; the small current system earth protective device is made of microcomputer-based intelligent controller 1, phase-splitting isolating switch 2 and zero sequence current mutual inductor 5; described microcomputer-based intelligent controller 1 has the single-chip microcomputer of high-speed, high precision sampling for many CPU; the control end of phase-splitting isolating switch 2 is connected with the output terminal of microcomputer-based intelligent controller 1, microcomputer-based intelligent controller 1 be provided with three-phase voltage input end Ua, Ub, Uc, system line voltage input end U1 and residual voltage input end Un and dc supply input+KM ,-KM.Three phase-splitting isolating switch 2 one ends are connected with substation bus bar A, B, C, and the other end is connected with grounded screen 6 by the Low ESR current limiting reactor 3 with secondary coil, and described Low ESR current limiting reactor 3 has primary winding W1 and secondary coil W2.Secondary coil W at Low ESR current limiting reactor 3
2The K switch of side by cut-offfing by 1 control of microcomputer-based intelligent controller
1Be connected to high-frequency voltage signal generator 4.Microcomputer-based intelligent controller 1 real-time acquisition system line, phase voltage and residual voltage, changing judgement system according to system line, phase voltage and residual voltage has or not singlephase earth fault and ground connection separate, when taking place, singlephase earth fault provides the instruction of ground connection phase breaker closing, ground connection phase isolating switch is closed a floodgate fast, link to each other with grounded screen 6 by Low ESR current limiting reactor 3 mutually at 0.05 second internal fault, realize multiple grounding, thereby shift trouble spot place's ground current and extinguish place, trouble spot ground arc; This moment Low ESR current limiting reactor 3 primary winding W
1On have the system earth electric current to flow through, microcomputer-based intelligent controller 1 detects by zero sequence current mutual inductor 5 and makes K switch 1 closure after electric current is arranged, will with Low ESR current limiting reactor 3 secondary coil W
2The high-frequency voltage signal generator 4 that connects is devoted oneself to work, and is the high-frequency voltage signal of 100～400Hz to system's injected frequency, and at Low ESR current limiting reactor 3 primary winding W
1The fault that HF voltage of side induction, HF voltage act directly on system goes up the generation high-frequency current mutually, and this electric current flows among capacitance to earth-jXc of system and the fault loop stake resistance Rj; Move along faulty line by the hand-held high-frequency signal receiver and to carry out the trouble spot and search, when leave certain some back received signal that of correspondence when dying down gradually by force be earth fault.
Claims (2)
1. single-phase ground fault positioning method for ground protective device of low-current system, it is characterized in that: by microcomputer-based intelligent controller real-time acquisition system line, phase voltage and residual voltage and according to system line, phase voltage and residual voltage change judgement system and have or not singlephase earth fault and ground connection separate, when taking place, singlephase earth fault provides the instruction of ground connection phase breaker closing, it is characterized in that: link to each other with grounded screen by the Low ESR current limiting reactor that has secondary coil behind the ground connection phase breaker closing, realize multiple grounding, thereby shift trouble spot place's ground current and extinguish place, trouble spot ground arc; There is the system earth electric current to flow through on the primary winding of Low ESR current limiting reactor at this moment, the microcomputer-based intelligent controller detects by zero sequence current mutual inductor has the high frequency signal generator that will be connected with Low ESR current limiting reactor secondary coil behind the electric current to devote oneself to work, inject high-frequency voltage signal to system, produce high-frequency current in a HF voltage of Low ESR current limiting reactor primary winding side induction and the fault that acts directly on system on mutually, this electric current flows among system's capacitance to earth and the fault loop stake resistance; Move along faulty line by the hand-held high-frequency signal receiver and to carry out the trouble spot and search, when leave certain some back received signal that of correspondence when dying down gradually by force be earth fault.
2. single-phase ground fault positioning method for ground protective device of low-current system according to claim 1 is characterized in that: the frequency of described high-frequency voltage signal generator is 100～400Hz.
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| CN2009102207180A CN101726692B (en) | 2009-12-14 | 2009-12-14 | Single-phase ground fault positioning method for ground protective device of low-current system |
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| CN2009102207180A CN101726692B (en) | 2009-12-14 | 2009-12-14 | Single-phase ground fault positioning method for ground protective device of low-current system |
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| CN101726692A true CN101726692A (en) | 2010-06-09 |
| CN101726692B CN101726692B (en) | 2012-07-04 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102455399A (en) * | 2010-10-18 | 2012-05-16 | 黄洪全 | Tracking and locating device for earth fault of overhead line |
| CN103529357A (en) * | 2013-08-02 | 2014-01-22 | 吉林省电力有限公司长春供电公司 | Method for determining section of single-phase ground fault of 10kV power distribution system |
| CN106054030A (en) * | 2016-08-17 | 2016-10-26 | 积成电子股份有限公司 | Master station centralized type small-current grounding fault positioning method based on reactive load injection |
| CN106054031A (en) * | 2016-08-17 | 2016-10-26 | 积成电子股份有限公司 | Main station centralized low-current earth fault positioning method based on resistor load injection |
| CN106556774A (en) * | 2015-09-25 | 2017-04-05 | 浙江科畅电子有限公司 | Overhead transmission line grounding fault searching instrument |
| CN107153153A (en) * | 2016-03-02 | 2017-09-12 | 费希尔-罗斯蒙特系统公司 | Communication line failure is controlled from the detection of hand-held maintenance tool and position fixing process |
| CN107290629A (en) * | 2017-07-12 | 2017-10-24 | 国网青海省电力公司海南供电公司 | A kind of 10KV low-voltage networks Earth design method |
| CN107340416A (en) * | 2017-08-28 | 2017-11-10 | 国网江西省电力公司电力科学研究院 | A kind of distribution network failure indicator LC tunings are outer to apply signal source |
| CN107462811A (en) * | 2017-08-16 | 2017-12-12 | 杭州零尔电力科技有限公司 | A kind of method positioned using RS fractal dimensions to the trouble point in low current grounding |
| CN110865279A (en) * | 2019-12-10 | 2020-03-06 | 苏州银蕨电力科技有限公司 | Single-phase earth fault positioning method based on neutral point earth current starting |
| CN111537835A (en) * | 2020-04-26 | 2020-08-14 | 伟宸科技（武汉）有限公司 | Small current grounding searching mode and device |
| CN112485714A (en) * | 2020-11-30 | 2021-03-12 | 云南电网有限责任公司电力科学研究院 | High-sensitivity ground fault detection and identification method and device |
| CN113419139A (en) * | 2021-07-30 | 2021-09-21 | 广东电网有限责任公司 | High-resistance grounding fault positioning method and related device for small-resistance grounding system |
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| CN100386637C (en) * | 2005-01-12 | 2008-05-07 | 杭州佳和电气有限公司 | Fault line selection method for single-phase-to-ground fault in small ground current distribution network |
| CN101452038B (en) * | 2007-11-29 | 2012-01-25 | 上海蓝瑞软件技术有限公司 | Low current neutral grounding electric network single-phase earth fault diagnostic method |
| CN101325332B (en) * | 2008-07-30 | 2010-06-09 | 北京四方继保自动化股份有限公司 | Method for implementing element for measuring earthing distance without relevance to load current and ground resistance |
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| CN102455399A (en) * | 2010-10-18 | 2012-05-16 | 黄洪全 | Tracking and locating device for earth fault of overhead line |
| CN102455399B (en) * | 2010-10-18 | 2015-12-16 | 黄洪全 | Overhead transmission line earth fault seeks track locating device |
| CN103529357A (en) * | 2013-08-02 | 2014-01-22 | 吉林省电力有限公司长春供电公司 | Method for determining section of single-phase ground fault of 10kV power distribution system |
| CN106556774A (en) * | 2015-09-25 | 2017-04-05 | 浙江科畅电子有限公司 | Overhead transmission line grounding fault searching instrument |
| CN107153153A (en) * | 2016-03-02 | 2017-09-12 | 费希尔-罗斯蒙特系统公司 | Communication line failure is controlled from the detection of hand-held maintenance tool and position fixing process |
| US11368384B2 (en) | 2016-03-02 | 2022-06-21 | Fisher-Rosemount Systems, Inc. | Detecting and locating process control communication line faults from a handheld maintenance tool |
| CN106054030A (en) * | 2016-08-17 | 2016-10-26 | 积成电子股份有限公司 | Master station centralized type small-current grounding fault positioning method based on reactive load injection |
| CN106054031A (en) * | 2016-08-17 | 2016-10-26 | 积成电子股份有限公司 | Main station centralized low-current earth fault positioning method based on resistor load injection |
| CN107290629B (en) * | 2017-07-12 | 2020-09-01 | 国网青海省电力公司海南供电公司 | 10KV low-voltage distribution network ground fault positioning method |
| CN107290629A (en) * | 2017-07-12 | 2017-10-24 | 国网青海省电力公司海南供电公司 | A kind of 10KV low-voltage networks Earth design method |
| CN107462811A (en) * | 2017-08-16 | 2017-12-12 | 杭州零尔电力科技有限公司 | A kind of method positioned using RS fractal dimensions to the trouble point in low current grounding |
| CN107340416A (en) * | 2017-08-28 | 2017-11-10 | 国网江西省电力公司电力科学研究院 | A kind of distribution network failure indicator LC tunings are outer to apply signal source |
| CN110865279A (en) * | 2019-12-10 | 2020-03-06 | 苏州银蕨电力科技有限公司 | Single-phase earth fault positioning method based on neutral point earth current starting |
| CN111537835A (en) * | 2020-04-26 | 2020-08-14 | 伟宸科技（武汉）有限公司 | Small current grounding searching mode and device |
| CN111537835B (en) * | 2020-04-26 | 2022-07-26 | 伟宸科技（武汉）有限公司 | Small current grounding searching mode and device |
| CN112485714A (en) * | 2020-11-30 | 2021-03-12 | 云南电网有限责任公司电力科学研究院 | High-sensitivity ground fault detection and identification method and device |
| CN112485714B (en) * | 2020-11-30 | 2022-08-19 | 云南电网有限责任公司电力科学研究院 | High-sensitivity ground fault detection and identification method and device |
| CN113419139A (en) * | 2021-07-30 | 2021-09-21 | 广东电网有限责任公司 | High-resistance grounding fault positioning method and related device for small-resistance grounding system |
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Owner name: STATE ELECTRIC NET CROP. Effective date: 20121011 |
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Effective date of registration: 20121011 Address after: 121000 Guta District, Liaoning, Jiefang Road No. three, No. 9, No. Patentee after: Jinzhou Power Supply Company of Liaoning Electric Power Co., Ltd. Patentee after: State Grid Corporation of China Address before: 121000 Guta District, Liaoning, Jiefang Road No. three, No. 9, No. Patentee before: Jinzhou Power Supply Company of Liaoning Electric Power Co., Ltd. |
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Inventor after: Zhang Wenhui Inventor after: Huang Gang Inventor after: Li Yanlong Inventor after: Zhang Zhonglin Inventor before: Zhang Wenhui Inventor before: Huang Gang |
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Free format text: CORRECT: INVENTOR; FROM: ZHANG WENHUI HUANG GANG TO: ZHANG WENHUI HUANG GANG LI YANLONG ZHANG ZHONGLIN |