CN206640300U - Controllable zero-sequence current distribution earth fault isolating device - Google Patents
Controllable zero-sequence current distribution earth fault isolating device Download PDFInfo
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- CN206640300U CN206640300U CN201720330024.2U CN201720330024U CN206640300U CN 206640300 U CN206640300 U CN 206640300U CN 201720330024 U CN201720330024 U CN 201720330024U CN 206640300 U CN206640300 U CN 206640300U
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- earth fault
- terminal
- sequence current
- current distribution
- center station
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Abstract
The utility model 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) electrically connects with the secondary side terminal of busbar voltage sensor (4), output end electrically connects with the control terminal of three-phase synchronous operation switch (2) and the control signal terminal (7) of on-pole switch, signal source is to be connected across after three-phase synchronous operation switch (2) concatenates 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
Technical field
A kind of fault isolation device is the utility model is related to, especially a kind of controllable zero-sequence current distribution earth fault isolation
Device.
Background technology
In the network system that the 3-66kV neutral points in China are not directly grounded, it is most common that singlephase earth fault, which occurs,
A kind of failure.When singlephase earth fault occurs, fault branch need to be found in time and it is handled, otherwise, easily triggered
Big supplies safe distribution of electric power accident.At present, people are made that various effort, such as a kind of entitled " base to obtain abort situation as early as possible
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 referred in this article is mainly largely 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 bigger, and the signal characteristic of the point of failure indicator collection on fault branch is obvious --- positioning
Accurately, however, when the singlephase earth fault of middle impedance or high impedance occurs, due to network system itself zero-sequence current very
It is small, characteristic quantity unobvious, so as to cause to position exactly；Secondly, it is impossible in time by Fault Isolation, so as to avoid accident
Further expansion.
Utility model content
The technical problems to be solved in the utility model is to overcome weak point of the prior art, there is provided a kind of structure is closed
Reason, can accurate isolated fault point controllable zero-sequence current distribution earth fault isolating device.
To solve technical problem of the present utility model, used technical scheme is controllable zero-sequence current distribution ground connection event
Barrier isolating device includes center station processor and the point of failure indicator being connected electrically, and the signal electrically connected with bus
Source, particularly：
The input of the center station processor electrically connects with the secondary side terminal of busbar voltage sensor, output end and three-phase
The control terminal 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 singlephase earth fault, center station processor occurs
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.
Further improvement as 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.
It is relative to the beneficial effect of prior art：
After such structure, if occur singlephase earth fault, with three-phase synchronous operation switch instantaneous closure,
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, produces a characteristic quantity obviously zero sequence electricity therefrom
Stream, it is ensured that the accuracy of localization of fault；On this basis, center station processor is cut to what the on-pole switch of trouble point was 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 utility model.
Embodiment
Preferred embodiment of the present utility model 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 electrically connect with the control terminal of three-phase synchronous operation switch 2 and the control signal terminal 7 of on-pole switch；Wherein, in
Center station processor 6 is comparator (or comparison circuit, or digital signal processor, or single-chip microcomputer, or microcomputer), itself and therefore
It is dedicated radio link between barrier point indicator 3.
Three-phase synchronous operation switch 2 as signal source is connected across bus end after being connected in series with impedance earth transformer 5
Between son 1 and ground terminal 8.
In use, the bus terminal 1 of the present apparatus and ground terminal 8 need to be only respectively connected to 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 perceives generation single-phase earthing by the secondary side terminal 4 of busbar voltage sensor
Failure, just instantaneously 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
After point indicator 3 perceives and its accurate position is reported and submitted into center station processor 6 simultaneously, 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 be to controllable zero-sequence current distribution earth fault isolation dress of the present utility model
Put and carry out various changes and modification without departing from spirit and scope of the present utility model.So, if to it is of the present utility model this
A little modifications and variations belong within the scope of the utility model claims and its equivalent technologies, then the utility model is also intended to wrap
Including these changes and modification.
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) electrically connects with the secondary side terminal of busbar voltage sensor (4), output end and three
The control terminal 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) instantaneously after 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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720330024.2U CN206640300U (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 |
|---|---|---|---|
| CN201720330024.2U CN206640300U (en) | 2017-03-31 | 2017-03-31 | Controllable zero-sequence current distribution earth fault isolating device |
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| CN206640300U true CN206640300U (en) | 2017-11-14 |
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| CN201720330024.2U Active CN206640300U (en) | 2017-03-31 | 2017-03-31 | Controllable zero-sequence current distribution earth fault isolating device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106992504A (en) * | 2017-03-31 | 2017-07-28 | 安徽天电气技术股份有限公司 | Controllable zero-sequence current distribution earth fault isolating device |
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2017
- 2017-03-31 CN CN201720330024.2U patent/CN206640300U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106992504A (en) * | 2017-03-31 | 2017-07-28 | 安徽天电气技术股份有限公司 | Controllable zero-sequence current distribution earth fault isolating device |
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