CN103217627A - Earth fault positioning method of earth fault positioning system - Google Patents

Earth fault positioning method of earth fault positioning system Download PDF

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Publication number
CN103217627A
CN103217627A CN2013101039998A CN201310103999A CN103217627A CN 103217627 A CN103217627 A CN 103217627A CN 2013101039998 A CN2013101039998 A CN 2013101039998A CN 201310103999 A CN201310103999 A CN 201310103999A CN 103217627 A CN103217627 A CN 103217627A
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China
Prior art keywords
earth fault
fault
earth
computing machine
outlet
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Pending
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CN2013101039998A
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Chinese (zh)
Inventor
陈海昆
吴爱军
陈华霖
陈宇
连鸿波
孙雷
徐群
储吉峰
吴军生
张振
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SHANGHAI ZIHE COMMUNICATION TECHNOLOGY Co Ltd
State Grid Corp of China SGCC
Shanghai Municipal Electric Power Co
Original Assignee
SHANGHAI ZIHE COMMUNICATION TECHNOLOGY Co Ltd
State Grid Corp of China SGCC
Shanghai Municipal Electric Power Co
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Application filed by SHANGHAI ZIHE COMMUNICATION TECHNOLOGY Co Ltd, State Grid Corp of China SGCC, Shanghai Municipal Electric Power Co filed Critical SHANGHAI ZIHE COMMUNICATION TECHNOLOGY Co Ltd
Priority to CN2013101039998A priority Critical patent/CN103217627A/en
Publication of CN103217627A publication Critical patent/CN103217627A/en
Pending legal-status Critical Current

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Abstract

The invention discloses an earth fault positioning method of an earth fault positioning system. The earth fault positioning method comprises the following steps: performing fault line selection and informing a computer through earth line selection equipment; informing all fault indicators on an outgoing line with an earth fault to acquire even harmonic current by the computer; informing the earth line selection equipment to put in an even harmonic signal source by the computer; receiving the even harmonic current acquired by all the fault indicators on the outgoing line with earth fault by the computer; and realizing fault positioning by the computer according to all received even harmonic current. The positioning of an earth fault is more quickly, accurately and efficiently realized by matching with an earth fault positioning system in an earth fault positioning system for a power distribution network.

Description

A kind of earth fault localization method of earth fault positioning system
Technical field
The present invention relates to localization of fault, relate in particular to a kind of earth fault localization method of earth fault positioning system.
Background technology
Statistics shows that 70% fault is caused by ground connection in the 10kV distribution network failure, so be very important for the accurate judgement of earth fault and location to the development of following electrical network.At present, for the route selection problem of earth fault, though no problem substantially for system with effectively earthed neutral, but for system with non-effectively earthed neutral, its feasibility is little desirable in actual applications, and especially for the system of grounding through arc, the difficulty of route selection is bigger.For determining of grounding fault point position, subject matter is: the electronic type fault detector is constructing communication network how, and for non-effectively earthed system, adopts what kind of signal injection method to position.Therefore, the applicant in submitting on the same day of the application " a kind of earth fault positioning system that is used for power distribution network " patented claim by name.
This earth fault positioning system concrete structure as shown in Figure 1, comprise that earthing wire-selecting equipment 201, computing machine 202, some concentrators 203, distribution are installed in each outlet (1#, 2#...n#, n 〉=2 and be positive integer) on some fault detectors 204 and the even harmonics signal source 205 that connects neutral point 102, wherein:
Even harmonics signal source 205 comprises arc suppression coil L, K switch, resistance R, diode D and signal source (not shown), the plus earth of diode D, and receive the signal that described signal source (not shown) sends;
Earthing wire-selecting equipment 201 connection buss 101 and even harmonics signal source 205;
Each fault detector 204 is subordinated to a concentrator 203, this fault detector 204 or direct wireless connections are in this concentrator 203, and perhaps the mode with wireless cascade is connected in this concentrator 203 indirectly by other fault detectors 204 that are subordinated to this concentrator 203;
Computing machine 202 connects earthing wire-selecting equipment 201 by Ethernet, simultaneously by each concentrator 203 of GPRS network (not shown) wireless connections.
This earth fault positioning system can be carried out effective localization of fault to neutral point effective grounding and non-effectively earthed system.Yet, for make localization of fault quick more, accurately, efficient, need design a kind of with the supporting earth fault localization method of this earth fault positioning system.
Summary of the invention
The object of the present invention is to provide a kind of earth fault localization method that matches with " a kind of earth fault positioning system that is used for power distribution network " earth fault positioning system, thereby make the earth fault location quick more, accurate and efficient.
The technical scheme that realizes above-mentioned purpose is:
A kind of earth fault localization method of earth fault positioning system, described earth fault positioning system comprise even harmonics signal source, connection bus and the earthing wire-selecting equipment in described even harmonics signal source, some concentrators, computing machine and the some fault detectors that connects neutral point; Described computing machine connects described earthing wire-selecting equipment and passes through each concentrator of GPRS network wireless connections by Ethernet; Described each fault detector distributes and is installed in each bar outlet of drawing from bus; Each fault detector is subordinated to a concentrator, or directly wireless connections or are connected in this concentrator in the mode of wireless cascade by the fault detector that other are subordinated to this concentrator indirectly in this concentrator,
Described earth fault localization method comprises the following steps:
Step S1, described earthing wire-selecting equipment is gathered residual voltage and zero-sequence current from described bus, judges the outlet that earth fault takes place, and notifies described computing machine by Ethernet;
Step S2, described computing machine are successively by all concentrators in the outlet of GPRS network and described generation earth fault, and all fault detectors in the outlet of notice generation earth fault are gathered even-order harmonic electric currents;
Step S3, described computing machine notifies described earthing wire-selecting equipment to drop into described even harmonics signal source by Ethernet;
Step S4, described computing machine receive the even-order harmonic electric current that all fault detectors in the outlet that earth fault takes place are gathered successively by all concentrators and GPRS network in the outlet of described generation earth fault;
Step S5, described computing machine by judging the separation of even-order harmonic amplitude, judge the both sides fault detector of earth fault nidus according to all even-order harmonic electric currents that receive, and realize localization of fault.
The earth fault localization method of above-mentioned earth fault positioning system, wherein, described even harmonics signal source comprises arc suppression coil, switch, resistance and diode, wherein: described arc suppression coil one end connects described neutral point, other end ground connection; Described switch connects described neutral point and resistance; Described resistance connects the negative pole of described diode, the plus earth of described diode; Described earthing wire-selecting equipment connects described switch, by controlling the closure of this switch, realizes the input in described even harmonics signal source.
The invention has the beneficial effects as follows: the present invention is by the rational and effective arrangements of steps, match with " a kind of earth fault positioning system that is used for power distribution network " earth fault positioning system, thereby make the earth fault positioning system be grounded failure location more fast, accurately and efficiently.
Description of drawings
Fig. 1 is the structural representation of earth fault positioning system;
Fig. 2 is the process flow diagram of earth fault localization method of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
See also Fig. 2, earth fault localization method of the present invention, based on earth fault positioning system shown in Figure 1,
After earth fault took place, earth fault localization method of the present invention comprised the following steps:
Step S1, earthing wire-selecting equipment 201 is gathered residual voltage and zero-sequence current from bus 101, judge the outlet that earth fault takes place (1# or 2# or ... n#), by Ethernet notice computing machine 202 take place earth faults outlet (1# or 2# or ... n#);
Step S2, computing machine 202 successively by the GPRS network (not shown) and take place earth fault outlet (1# or 2# or ... all concentrators 203 n#), notice take place earth fault outlet (1# or 2# or ... all fault detectors 204 n#) are gathered even-order harmonic electric currents;
Step S3, computing machine 202 drops into even harmonics signal source 205 by Ethernet notice earthing wire-selecting equipment 201, and promptly the closure of gauge tap K realizes the input in even harmonics signal source 205;
Step S4, computing machine 202 outlet by earth fault takes place successively (1# or 2# or ... n#) go up all concentrator 203 and GPRS network, receive outlet that earth fault takes place (1# or 2# or ... the even-order harmonic electric current that all fault detectors 204 n#) are gathered;
Step S5, computing machine 202, judge earth fault and occur between which two fault detector 204 by judging the separation of even-order harmonic amplitude according to all even-order harmonic electric currents that receive, and realize localization of fault.
The earth fault positioning system of the present invention's coupling " a kind of earth fault positioning system that is used for power distribution network " is grounded failure location more fast, accurately and efficiently.
Above embodiment is only for the usefulness that the present invention is described, but not limitation of the present invention, person skilled in the relevant technique, under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or modification, therefore all technical schemes that are equal to also should belong to category of the present invention, should be limited by each claim.

Claims (2)

1. the earth fault localization method of an earth fault positioning system, described earth fault positioning system comprises even harmonics signal source, connection bus and the earthing wire-selecting equipment in described even harmonics signal source, some concentrators, computing machine and the some fault detectors that connects neutral point; Described computing machine connects described earthing wire-selecting equipment and passes through each concentrator of GPRS network wireless connections by Ethernet; Described each fault detector distributes and is installed in each bar outlet of drawing from bus; Each fault detector is subordinated to a concentrator, or directly wireless connections or are connected in this concentrator in the mode of wireless cascade by the fault detector that other are subordinated to this concentrator indirectly in this concentrator, it is characterized in that,
Described earth fault localization method comprises the following steps:
Step S1, described earthing wire-selecting equipment is gathered residual voltage and zero-sequence current from described bus, judges the outlet that earth fault takes place, and notifies described computing machine by Ethernet;
Step S2, described computing machine are successively by all concentrators in the outlet of GPRS network and described generation earth fault, and all fault detectors in the outlet of notice generation earth fault are gathered even-order harmonic electric currents;
Step S3, described computing machine notifies described earthing wire-selecting equipment to drop into described even harmonics signal source by Ethernet;
Step S4, described computing machine receive the even-order harmonic electric current that all fault detectors in the outlet that earth fault takes place are gathered successively by all concentrators and GPRS network in the outlet of described generation earth fault;
Step S5, described computing machine by judging the separation of even-order harmonic amplitude, judge the both sides fault detector of earth fault nidus according to all even-order harmonic electric currents that receive, and realize localization of fault.
2. the earth fault localization method of earth fault positioning system according to claim 1, it is characterized in that, described even harmonics signal source comprises arc suppression coil, switch, resistance and diode, and wherein: described arc suppression coil one end connects described neutral point, other end ground connection; Described switch connects described neutral point and resistance; Described resistance connects the negative pole of described diode, the plus earth of described diode; Described earthing wire-selecting equipment connects described switch, by controlling the closure of this switch, realizes the input in described even harmonics signal source.
CN2013101039998A 2013-03-28 2013-03-28 Earth fault positioning method of earth fault positioning system Pending CN103217627A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103454561A (en) * 2013-09-12 2013-12-18 国家电网公司 Single-phase earth fault positioning method of power distribution network
CN104730413A (en) * 2014-12-11 2015-06-24 广西星宇智能电气有限公司 Power distribution network line single-phase grounding distribution type positioning method and system thereof
CN104914352A (en) * 2015-05-07 2015-09-16 国家电网公司 NUGS single-phase grounding fault location method based on harmonic difference distinguishing
CN105093068A (en) * 2015-08-31 2015-11-25 国家电网公司 Undercurrent single-phase earth fault line selection and positioning apparatus
CN109995548A (en) * 2017-12-29 2019-07-09 深圳市优必选科技有限公司 Device management method and system, data transmission method and system and terminal device

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CN102565626A (en) * 2012-01-12 2012-07-11 保定供电公司 On-line positioning method and system of section with low-current ground faults
CN102937675A (en) * 2012-10-22 2013-02-20 江苏省电力公司常州供电公司 Real-time data collecting and fault positioning system of power distribution network and working method thereof

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JP2002140123A (en) * 2000-10-30 2002-05-17 Canon Inc Electric power converter and control method therefor, and generating set
CN101551432A (en) * 2009-05-07 2009-10-07 江苏省电力公司常州供电公司 Power distribution network fault positioning method
CN102565626A (en) * 2012-01-12 2012-07-11 保定供电公司 On-line positioning method and system of section with low-current ground faults
CN102937675A (en) * 2012-10-22 2013-02-20 江苏省电力公司常州供电公司 Real-time data collecting and fault positioning system of power distribution network and working method thereof

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103454561A (en) * 2013-09-12 2013-12-18 国家电网公司 Single-phase earth fault positioning method of power distribution network
CN103454561B (en) * 2013-09-12 2015-11-18 国家电网公司 A kind of one-phase earthing failure in electric distribution network localization method
CN104730413A (en) * 2014-12-11 2015-06-24 广西星宇智能电气有限公司 Power distribution network line single-phase grounding distribution type positioning method and system thereof
CN104914352A (en) * 2015-05-07 2015-09-16 国家电网公司 NUGS single-phase grounding fault location method based on harmonic difference distinguishing
CN104914352B (en) * 2015-05-07 2017-09-29 国家电网公司 A kind of NUGS method for locating single-phase ground fault differentiated based on harmonic wave difference
CN105093068A (en) * 2015-08-31 2015-11-25 国家电网公司 Undercurrent single-phase earth fault line selection and positioning apparatus
CN109995548A (en) * 2017-12-29 2019-07-09 深圳市优必选科技有限公司 Device management method and system, data transmission method and system and terminal device
CN109995548B (en) * 2017-12-29 2022-05-10 深圳市优必选科技有限公司 Device management method and system, data transmission method and system and terminal device

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Application publication date: 20130724