CN106896295A - Controllable zero-sequence current distribution earth fault positioning device - Google Patents
Controllable zero-sequence current distribution earth fault positioning device Download PDFInfo
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- CN106896295A CN106896295A CN201710205697.XA CN201710205697A CN106896295A CN 106896295 A CN106896295 A CN 106896295A CN 201710205697 A CN201710205697 A CN 201710205697A CN 106896295 A CN106896295 A CN 106896295A
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- Prior art keywords
- earth fault
- sequence current
- current distribution
- positioning device
- synchronous operation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
Abstract
The invention discloses a kind of controllable zero-sequence current distribution earth fault positioning 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), particularly the input of center station processor (6) is electrically connected with the secondary side terminal of busbar voltage sensor (4), output end is electrically connected with the control end of three-phase synchronous operation switch (2), signal source is connected across between bus terminal (1) and ground terminal (7) after being connected in series for three-phase synchronous operation switch (2) and impedance earth transformer (5), for after busbar voltage Sensor monitoring is to generation singlephase earth fault, instantaneously closure three-phase synchronous operation switchs (2) to center station processor (6).It has high fault location accuracy rate, can be widely used in the singlephase earth fault zone location field of power system with neutral point nondirectly grounding system.
Description
Technical field
The present invention relates to a kind of fault locator, especially a kind of controllable zero-sequence current distribution Earth design dress
Put.
Background technology
In the network system that the 3-66kV neutral points of China are not directly grounded, it is most common that singlephase earth fault occurs
A kind of failure.When there is singlephase earth fault, need in time find fault branch and it is processed, otherwise, easily trigger
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 flows through this circuit to special pulse frequency signal altogether, failure probe detection is injected in circuit
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：Be only capable of being accurately positioned low-impedance singlephase earth fault, thus when power network system
Zero-sequence current in system is than larger, and the signal characteristic of the point of failure indicator collection on fault branch is obvious --- accurate positioning；
However, when there is the singlephase earth fault of middle impedance or high impedance, it is special because the zero-sequence current of network system itself is very small
The amount of levying is not obvious, so as to cause to position exactly.
The content of the invention
The technical problem to be solved in the present invention is to overcome weak point of the prior art, there is provided it is a kind of it is rational in infrastructure, can
It is accurately positioned the controllable zero-sequence current distribution earth fault positioning device of fault zone.
To solve technical problem of the invention, the technical scheme for being used is for controllable zero-sequence current distribution earth fault is determined
Position device includes center station processor and the point of failure indicator being connected electrically, and the signal source electrically connected with bus, 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 electrical connection of synchronous operation switch；
The signal source is to be connected across bus terminal after three-phase synchronous operation switch is connected with impedance earth transformer series
With between ground terminal, for after busbar voltage Sensor monitoring is to generation singlephase earth fault, center station processor instantaneously to be closed
Close three-phase synchronous operation switch.
As the further improvement of controllable zero-sequence current distribution earth fault positioning device：
Preferably, the time of instantaneous closure 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 using such structure, as long as there is 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, and 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, drastically increases the accuracy rate of positioning.So that the present apparatus can be widely used in power system with neutral point nondirectly grounding system
Singlephase earth fault zone location field.
Brief description of the drawings
Fig. 1 is a kind of basic circuit structure schematic diagram of the invention.
Specific embodiment
Preferred embodiment of the 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 positioning 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；Wherein, center station processor 6 is Digital Signal Processing
Device (or comparator, or single-chip microcomputer, or microcomputer), it is dedicated radio link between point of failure indicator 3.
Bus end is connected across after being connected in series with impedance earth transformer 5 as the three-phase synchronous operation switch 2 of signal source
Between son 1 and ground terminal 7.
When using, only the bus terminal 1 of the present apparatus and ground terminal 7 need to be respectively connected to the confession that neutral point is not directly grounded
In distribution network system；Three terminals in bus terminal 1 therein A phases respectively with bus ABC, B phases and C are electrically connected.
When the center station processor 6 of the present apparatus perceives generation single-phase earthing by the secondary side terminal 4 of busbar voltage sensor
After failure, just instantaneous closure three-phase synchronous operation switchs 2 immediately, wherein, the time of instantaneous closure is≤10s；So as in neutrality
A very big zero-sequence current is produced in the network system that point is not directly grounded, and then by the event at generation singlephase earth fault
Barrier point indicator 3 perceives and its accurate position is reported and submitted into center station processor 6 simultaneously, realizes the real-time accurate fixed of failure
Position.
Obviously, those skilled in the art can enter to controllable zero-sequence current distribution earth fault positioning device of the 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 of the invention and modification
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 positioning 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 electrical connection of phase same period Operation switch (2)；
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 (7), for after busbar voltage Sensor monitoring is to generation singlephase earth fault, central station to be processed
Instantaneously closure three-phase synchronous operation switchs (2) to device (6).
2. controllable zero-sequence current distribution earth fault positioning device according to claim 1, it is characterized in that instantaneous closure
Time is≤10s.
3. controllable zero-sequence current distribution earth fault positioning device according to claim 1, it is characterized in that central station is processed
Device (6) is comparator, or digital signal processor, or single-chip microcomputer, or microcomputer.
4. controllable zero-sequence current distribution earth fault positioning device according to claim 1, it is characterized in that central station is processed
It is dedicated radio link between device (6) and point of failure indicator (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710205697.XA CN106896295A (en) | 2017-03-31 | 2017-03-31 | Controllable zero-sequence current distribution earth fault positioning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710205697.XA CN106896295A (en) | 2017-03-31 | 2017-03-31 | Controllable zero-sequence current distribution earth fault positioning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106896295A true CN106896295A (en) | 2017-06-27 |
Family
ID=59193477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710205697.XA Withdrawn CN106896295A (en) | 2017-03-31 | 2017-03-31 | Controllable zero-sequence current distribution earth fault positioning device |
Country Status (1)
| Country | Link |
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| CN (1) | CN106896295A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107247217A (en) * | 2017-07-19 | 2017-10-13 | 云南电网有限责任公司电力科学研究院 | A kind of distribution network fault positioning device |
| CN107918079A (en) * | 2017-11-17 | 2018-04-17 | 云南电网有限责任公司电力科学研究院 | A kind of one-phase earthing failure in electric distribution network localization method and system based on frequency sweep injection |
| CN109188167A (en) * | 2018-08-28 | 2019-01-11 | 厦门科华恒盛股份有限公司 | Ground fault detection device and method |
| CN109188166A (en) * | 2018-08-28 | 2019-01-11 | 厦门科华恒盛股份有限公司 | Ground fault detection device and method |
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| 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 |
| CN206696374U (en) * | 2017-03-31 | 2017-12-01 | 安徽一天电气技术股份有限公司 | Controllable zero-sequence current distribution earth fault positioning device |
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2017
- 2017-03-31 CN CN201710205697.XA patent/CN106896295A/en not_active Withdrawn
Patent Citations (6)
| 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 |
| CN206696374U (en) * | 2017-03-31 | 2017-12-01 | 安徽一天电气技术股份有限公司 | Controllable zero-sequence current distribution earth fault positioning device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107247217A (en) * | 2017-07-19 | 2017-10-13 | 云南电网有限责任公司电力科学研究院 | A kind of distribution network fault positioning device |
| CN107918079A (en) * | 2017-11-17 | 2018-04-17 | 云南电网有限责任公司电力科学研究院 | A kind of one-phase earthing failure in electric distribution network localization method and system based on frequency sweep injection |
| CN109188167A (en) * | 2018-08-28 | 2019-01-11 | 厦门科华恒盛股份有限公司 | Ground fault detection device and method |
| CN109188166A (en) * | 2018-08-28 | 2019-01-11 | 厦门科华恒盛股份有限公司 | Ground fault detection device and method |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20170627 |
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| WW01 | Invention patent application withdrawn after publication |