CN106992504A - Controllable zero-sequence current distribution earth fault isolating device - Google Patents

Controllable zero-sequence current distribution earth fault isolating device Download PDF

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Publication number
CN106992504A
CN106992504A CN201710205654.1A CN201710205654A CN106992504A CN 106992504 A CN106992504 A CN 106992504A CN 201710205654 A CN201710205654 A CN 201710205654A CN 106992504 A CN106992504 A CN 106992504A
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CN
China
Prior art keywords
earth fault
sequence current
electrically
terminal
switch
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.)
Withdrawn
Application number
CN201710205654.1A
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Chinese (zh)
Inventor
芮骏
余银钢
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Anhui Electric Technology Ltd By Share Ltd
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Anhui Electric Technology Ltd By Share Ltd
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Publication date
Application filed by Anhui Electric Technology Ltd By Share Ltd filed Critical Anhui Electric Technology Ltd By Share Ltd
Priority to CN201710205654.1A priority Critical patent/CN106992504A/en
Publication of CN106992504A publication Critical patent/CN106992504A/en
Withdrawn legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured

Abstract

The invention discloses a kind of controllable zero-sequence current distribution earth fault isolating device.It includes center station processor (6) and the point of failure indicator (3) being connected electrically, and the signal source electrically connected with bus (ABC), the input of center station processor (6) is electrically connected with the secondary side terminal of busbar voltage sensor (4), output end switchs the control end of (2) with three-phase synchronous operation and the control signal terminal (7) of on-pole switch is electrically connected, signal source is to be connected across after three-phase synchronous operation switch (2) is concatenated with impedance earth transformer (5) between bus terminal (1) and ground terminal (8), for when busbar voltage Sensor monitoring to singlephase earth fault, center station processor (6) is instantaneously after closure three-phase synchronous operation switch (2), send the control signal of excision singlephase earth fault branch road.It has high trouble point isolation rate, can be widely used in the singlephase earth fault isolation field of power system with neutral point nondirectly grounding system.

Description

Controllable zero-sequence current distribution earth fault isolating device
Technical field
The present invention relates to a kind of fault isolation device, especially a kind of controllable zero-sequence current distribution earth fault isolation dress Put.
Background technology
In the network system that the 3-66kV neutral points of China are not directly grounded, it is most common to occur singlephase earth fault A kind of failure.When occurring singlephase earth fault, fault branch need to be found in time and it is handled, otherwise, easily triggered Big confession safe distribution of electric power accident.At present, people are made that various effort to obtain abort situation as early as possible, such as a kind of entitled " base In the auto fault locating system for distribution feeders of fault detector ",《Power equipment》In October, 2005 the 10th phase 66-67 of volume 6 The article of page.The fault location system that is referred in this article is main substantial amounts of to be installed on each lines branch by what is electrically connected with central station Failure probe on the branch line at place, and the signal source composition electrically connected with power network bus;When any point occurs on circuit During singlephase earth fault, signal source injects special pulse frequency signal altogether into circuit, and this circuit is flowed through in failure probe detection The wireless messages of fault location are sent during signal specific to central station.Though this fault location system can enter to singlephase earth fault Row positioning, but there are still weak point, first, is only capable of being accurately positioned low-impedance singlephase earth fault, therefore when Zero-sequence current in network system is than larger, and the signal characteristic of the point of failure indicator collection on fault branch is obvious --- positioning Accurately, however, when occurring the singlephase earth fault of middle impedance or high impedance, due to network system itself zero-sequence current very Small, characteristic quantity is not obvious, so as to cause to position exactly;Secondly, it is impossible in time by Fault Isolation, so as to avoid accident Further expansion.
The content of the invention
The technical problem to be solved in the present invention for overcome weak point of the prior art there is provided one kind it is rational in infrastructure, can The controllable zero-sequence current distribution earth fault isolating device of accurate isolated fault point.
To solve the technical problem of the present invention, the technical scheme used for, controllable zero-sequence current distribution earth fault every Include center station processor and the point of failure indicator being connected electrically, and the signal source electrically connected with bus from device, it is special It is not:
The input of the center station processor is electrically connected with the secondary side terminal of busbar voltage sensor, output end and three-phase The control end of synchronous operation switch and the control signal terminal electrical connection of on-pole switch;
The signal source is to be connected across bus terminal after three-phase synchronous operation switch is connected with impedance earth transformer series Between ground terminal, for instantaneously being closed when busbar voltage Sensor monitoring to occurring singlephase earth fault, center station processor After three-phase synchronous operation switch, the control signal terminal through on-pole switch sends the control letter of excision singlephase earth fault branch road Number.
It is used as the further improvement of controllable zero-sequence current distribution earth fault isolating device:
Preferably, the time instantaneously closed is≤10s.
Preferably, center station processor is comparator, or digital signal processor, or single-chip microcomputer, or microcomputer.
Preferably, it is dedicated radio link between center station processor and point of failure indicator.
Beneficial effect relative to prior art is:
After such structure, as long as occurring singlephase earth fault, with the instantaneous closure that three-phase synchronous operation is switched, Impedance earth transformer is instantaneously put into, and instantaneously changes the earthing mode of network system, neutral point is not directly grounded Network system instantaneously changes into resistance grounded system in neutral point, and a characteristic quantity obviously zero sequence electricity is produced therefrom Stream, it is ensured that the accuracy of localization of fault;On this basis, center station processor is to cutting that the on-pole switch of trouble point is sent Except signal has very strong positioning specific aim, trouble point is set to be isolated in time.So that the present apparatus can be widely used in The singlephase earth fault isolation field of power system with neutral point nondirectly grounding system.
Brief description of the drawings
Fig. 1 is a kind of basic circuit structure schematic diagram of the present invention.
Embodiment
The preferred embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.
Referring to Fig. 1, the composition of controllable zero-sequence current distribution earth fault isolating device is as follows:
The input of center station processor 6 is electric with point of failure indicator 3, the secondary side terminal 4 of busbar voltage sensor respectively Connection, output end are electrically connected with the control end of three-phase synchronous operation switch 2 and the control signal terminal 7 of on-pole switch;Wherein, in Center station processor 6 is digital signal processor (or comparator, or single-chip microcomputer, or microcomputer), itself and point of failure indicator 3 Between be dedicated radio link.
Bus end is connected across after being connected in series as the three-phase synchronous operation switch 2 of signal source with impedance earth transformer 5 Between son 1 and ground terminal 8.
In use, only the bus terminal 1 and ground terminal 8 of the present apparatus need to be respectively connected into the confession that neutral point is not directly grounded In distribution network system;A phase, B phase and C of three terminals respectively with bus ABC in bus terminal 1 therein is electrically connected.
When the center station processor 6 of the present apparatus by the secondary side terminal 4 of busbar voltage sensor perceives generation single-phase earthing Failure, just instantaneous closure three-phase synchronous operation switchs 2 immediately, wherein, the time instantaneously closed is≤10s;So as in neutral point A very big zero-sequence current is produced in the network system not being directly grounded, and then by the failure at generation singlephase earth fault Point indicator 3 is perceived and while its accurate position is reported and submitted after center station processor 6, center station processor 6 on post through opening The control signal terminal 7 of pass sends the control signal of excision singlephase earth fault branch road to the on-pole switch of fault point, realizes The real-time accurate isolation of trouble point.
Obviously, those skilled in the art can enter to the controllable zero-sequence current distribution earth fault isolating device of the present invention The various changes of row and modification are without departing from the spirit and scope of the present invention.So, if to these modifications and variations of the present invention Belong within the scope of the claims in the present invention and its equivalent technologies, then the present invention is also intended to exist comprising these changes and modification It is interior.

Claims (4)

1. a kind of controllable zero-sequence current distribution earth fault isolating device, including center station processor (6) and it is connected electrically Point of failure indicator (3), and the signal source electrically connected with bus (ABC), it is characterised in that:
The input of the center station processor (6) is electrically connected with the secondary side terminal of busbar voltage sensor (4), output end and three The control end of phase same period Operation switch (2) and control signal terminal (7) electrical connection of on-pole switch;
The signal source is to be connected across bus end after three-phase synchronous operation switch (2) is connected in series with impedance earth transformer (5) Between sub (1) and ground terminal (8), for when busbar voltage Sensor monitoring to generation singlephase earth fault, center station processor (6) after instantaneous closure three-phase synchronous operation switch (2), the control signal terminal (7) through on-pole switch sends excision single-phase earthing The control signal of fault branch.
2. controllable zero-sequence current distribution earth fault isolating device according to claim 1, it is characterized in that instantaneously close Time is≤10s.
3. controllable zero-sequence current distribution earth fault isolating device according to claim 1, it is characterized in that central station is handled Device (6) is comparator, or digital signal processor, or single-chip microcomputer, or microcomputer.
4. controllable zero-sequence current distribution earth fault isolating device according to claim 1, it is characterized in that central station is handled It is dedicated radio link between device (6) and point of failure indicator (3).
CN201710205654.1A 2017-03-31 2017-03-31 Controllable zero-sequence current distribution earth fault isolating device Withdrawn CN106992504A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710205654.1A CN106992504A (en) 2017-03-31 2017-03-31 Controllable zero-sequence current distribution earth fault isolating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710205654.1A CN106992504A (en) 2017-03-31 2017-03-31 Controllable zero-sequence current distribution earth fault isolating device

Publications (1)

Publication Number Publication Date
CN106992504A true CN106992504A (en) 2017-07-28

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CN201710205654.1A Withdrawn CN106992504A (en) 2017-03-31 2017-03-31 Controllable zero-sequence current distribution earth fault isolating device

Country Status (1)

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CN (1) CN106992504A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100321838A1 (en) * 2009-06-18 2010-12-23 General Electric Company Arc flash detection system
CN103176109A (en) * 2013-03-28 2013-06-26 国家电网公司 Earth fault locating system for power distribution network
CN104251959A (en) * 2014-09-18 2014-12-31 云南电网公司电力科学研究院 Method and device for positioning and detecting single-phase grounding fault of power distribution grid
CN104518506A (en) * 2014-11-24 2015-04-15 安徽泰瑞通达机电设备有限公司 Arc suppresser allowing distinguishing of intra-station arc grounding, extra-station grounding and motor stator arc grounding
CN105093061A (en) * 2015-06-11 2015-11-25 江苏安方电力科技有限公司 Power distribution network line fault on-line monitoring and alarming system
CN206640300U (en) * 2017-03-31 2017-11-14 安徽一天电气技术股份有限公司 Controllable zero-sequence current distribution earth fault isolating device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100321838A1 (en) * 2009-06-18 2010-12-23 General Electric Company Arc flash detection system
CN103176109A (en) * 2013-03-28 2013-06-26 国家电网公司 Earth fault locating system for power distribution network
CN104251959A (en) * 2014-09-18 2014-12-31 云南电网公司电力科学研究院 Method and device for positioning and detecting single-phase grounding fault of power distribution grid
CN104518506A (en) * 2014-11-24 2015-04-15 安徽泰瑞通达机电设备有限公司 Arc suppresser allowing distinguishing of intra-station arc grounding, extra-station grounding and motor stator arc grounding
CN105093061A (en) * 2015-06-11 2015-11-25 江苏安方电力科技有限公司 Power distribution network line fault on-line monitoring and alarming system
CN206640300U (en) * 2017-03-31 2017-11-14 安徽一天电气技术股份有限公司 Controllable zero-sequence current distribution earth fault isolating device

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Application publication date: 20170728