CN206773117U - Line-selected earthing device - Google Patents
Line-selected earthing device Download PDFInfo
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- CN206773117U CN206773117U CN201720251991.XU CN201720251991U CN206773117U CN 206773117 U CN206773117 U CN 206773117U CN 201720251991 U CN201720251991 U CN 201720251991U CN 206773117 U CN206773117 U CN 206773117U
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- phase
- branch road
- controller
- current sensor
- kzq
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Abstract
The utility model discloses a kind of line-selected earthing device.It includes what bus terminal (A B C) concatenated between ground terminal (D)：Three-phase synchronous operation switchs (K3) and grounding transformer (B), split-phase Operation switch (K1), impedor (R1) and the second current sensor (CT2) and the phase-selecting switch (K2) for being parallel to impedor (R1) both ends, voltage sensor (PT), and the controller (KZQ) electrically connected with branch road zero sequence current sensor (CT3 CTn)；For after singlephase earth fault occurs, controller (KZQ) is first soft to close Sofe Switch branch road, after being closed again ground connection change branch road, according to the output of the second current sensor for≤1A to judge earth fault be transient single-phase earth fault when, disconnect Sofe Switch branch road and ground connection becomes branch road, otherwise after realizing route selection and positioning in conjunction with the differentiation exported to branch road zero sequence current sensor, disconnect ground connection and become branch road.It is extremely easy to processing and the route selection field that commercialization is widely used for earth fault.
Description
Technical field
A kind of line selection apparatus is the utility model is related to, especially a kind of line-selected earthing device.
Background technology
At present, power distribution network of the China based on neutral non-effective grounding mode has the advantage of power supply reliability height, mostly
Distribution system is supplied using this kind.Singlephase earth fault is failure common in which, and people are in order to determine the branch to break down
Road is simultaneously handled it in time, is made that unremitting effort, if Chinese utility model patent CN 202275132U were in 2012 years
A kind of pulse current route selection device for the applicant that June 13 was announced.The device by with the zero sequence current mutual inductor on branch road
The controller of secondary side electrical connection, the grounding transformer and igbt concatenated between bus and ground, and voltage
Transformer form, wherein, the gate pole of igbt electrically connects with the output end of controller, voltage transformer it is secondary
Side electrically connects with the input of controller；When singlephase earth fault occurs, controller can be obtained first by voltage transformer
Residual voltage during singlephase earth fault occurs, and therefore triggers igbt conducting, makes neutral point and failure
Branch road flows through stronger zero-sequence current, so that it is determined that go out be what branch road and it is therein what mutually there occurs earth fault.This dress
Though the branch road and phase that can quickly and accurately determine that earth fault occurs are put, but also there is shortcoming part, first, grasped in route selection
During work, strong transient current easily occurs, the not only insulation easily to each part in device produces impact injury, also easily
Secondary interference is produced to power distribution network；Secondly, for the frequent or longtime running of grounding transformer, larger nargin need to be left, is made
It is excessive into volume, increase the cost of manufacture；Finally, when permanent singlephase earth fault occurs, easily trouble point is made to restrike.
Utility model content
In place of the technical problems to be solved in the utility model is overcomes shortcoming of the prior art, there is provided one kind impact is small,
The line-selected earthing device that cost is low, is restriked without permanent singlephase earth fault.
To solve technical problem of the present utility model, used technical scheme is：Line-selected earthing device includes being serially connected with
Grounding transformer and voltage sensor between bus terminal and ground terminal, and it is electric with branch road zero sequence current sensor secondary side
The controller of connection, wherein, the secondary side of voltage sensor electrically connects with the input of controller, particularly,
The three-phase synchronous operation that its control terminal is electrically connected with the controller is serially connected between grounding transformer and the bus terminal
Switch；
Split-phase Operation switch, impedor and the second current sensor are serially connected between the bus terminal and ground terminal, its
In, the both ends of impedor are parallel with phase-selecting switch, the control terminal and controller of the split-phase Operation switch and phase-selecting switch it is defeated
Go out end electrical connection, the secondary side of second current sensor electrically connects with the input of controller, for working as voltage sensor
Monitor after singlephase earth fault occurs, controller first closes the failure phase contact in split-phase Operation switch, is closed again phase selection and opens
Close and three-phase synchronous operation switch, afterwards, according to the output of the second current sensor, to be disconnected during≤1A in split-phase Operation switch
Failure phase contact, phase-selecting switch and three-phase synchronous operation switch, otherwise combine branch road zero sequence current sensor output is sentenced
Route selection and positioning are not realized, and disconnect three-phase synchronous operation switch.
Further improvement as line-selected earthing device：
Preferably, the neutral point of grounding transformer is with concatenating current-limiting resistors and secondary side and controller between ground terminal
Input electrical connection the first current sensor；For by the output of the first current sensor and branch road zero sequence current sensor
The differentiation of output is compared, further to ensure the accuracy of route selection and positioning.
Preferably, it is serially connected with bus between three-phase synchronous operation switch, split-phase Operation switch, voltage sensor and bus terminal
Disconnecting switch.
Preferably, it is serially connected with branch road disconnecting switch between branch road zero sequence current sensor and branch road bus terminal.
Preferably, voltage sensor is resitstance voltage divider, or capacitive divider, or electromagnetic potential transformer, or electric capacity
Formula voltage transformer, or Hall voltage sensor.
Preferably, the first current sensor, the second current sensor are current divider, or electromagnetic current transducer, or electricity
Type current transformer, or fibre optic current sensor.
Preferably, impedor is Tandem devices more than one or both of resistor, inductor, capacitor.
Preferably, controller is microcomputer, or single-chip microcomputer, or digital signal processor.
It is relative to the beneficial effect of prior art：
After such structure, during earth fault and route selection operation occurs, both due to being operated out by split-phase
The presence for the Sofe Switch branch road that pass, impedor, phase-selecting switch and the second current sensor form and in advance action, and avoid strong
Strong transient current occurs, and has prevented the impact to device and the secondary interference to power distribution network；Reason three-phase synchronous operation is opened again
Close and the ground connection of grounding transformer composition becomes branch road and only operates in processing transient single-phase earth fault and permanent single-phase earthing
The process of failure line selection, grounding transformer therein is in idle state at other times, therefore can greatly reduce its volume
It is to provide metallic earthing, Du by Sofe Switch branch road due also to when permanent singlephase earth fault occurs with the cost of manufacture
The possibility that trouble point is restriked absolutely；More because in the soft closing course of Sofe Switch branch road, if there is the defeated of the second current sensor
Go out to be more than the situation of the capacitance current of distribution network system, you can be judged that there is phase selection mistake, single-phase earthing event can be re-started
The phase selection of barrier, the risk that line to line fault is grounded caused by phase selection mistake is efficiently avoid, makes it have single-phase earthing
The fault-tolerant and error correcting capability of Fault Phase Selection；So that the present apparatus is extremely easy to the processing and choosing that commercialization is widely used for earth fault
Line field.
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 line-selected earthing device is as follows：
Between bus terminal A-B-C and ground terminal D three branch roads are serially connected with through bus isolating switch A0：Ground connection change branch road,
Sofe Switch branch road and voltage detecting branch road.Wherein,
Ground connection becomes three-phase synchronous operation switch K3, grounding transformer B, the electricity of current-limiting resistor R2 and first of branch route concatenation
Flow sensor CT1 is formed；Three-phase synchronous operation switch K3 therein control terminal electrically connects with controller KZQ, and the first electric current passes
Sensor CT1 secondary side electrically connects with controller KZQ input.
Split-phase Operation switch K1, the impedor R1 and the second current sensor CT2 of Sofe Switch branch route concatenation, and impedance
Device R1 both ends are connected in parallel phase-selecting switch K2 compositions；Split-phase Operation switch K1 and phase-selecting switch K2 therein control terminal with
Controller KZQ output end electrical connection, the second current sensor CT2 secondary side electrically connect with controller KZQ input.
Voltage detecting branch road is the voltage sensor PT that its secondary side electrically connects with controller KZQ input.
Secondary sides of the controller KZQ also with branch road zero sequence current sensor CT3-CTn electrically connects；Branch road zero-sequence current senses
Branch road disconnecting switch A1-An is serially connected between device CT3-CTn and branch road bus terminal ZA-ZB-ZC.
Voltage sensor PT in above-mentioned each branch road is electromagnetic potential transformer (or resitstance voltage divider, or capacitance partial pressure
Device, or capacitance type potential transformer, or Hall voltage sensor), the first current sensor CT1, the second current sensor CT2 are
Electromagnetic current transducer (or current divider, or electronic current mutual inductor, or fibre optic current sensor), impedor R1 is resistance
Device (one or both of resistor, inductor, capacitor more than Tandem devices), controller KZQ be microcomputer (or
Single-chip microcomputer, or digital signal processor).
In use, only need to be by bus terminal A-B-C, the ground terminal D of the present apparatus and ZA-ZB-ZC points of branch road bus terminal
Jie Ru not be in the distribution network system that is not directly grounded of neutral point.
After the voltage sensor PT of the present apparatus monitors to occur singlephase earth fault, controller KZQ first closes split-phase behaviour
Make the failure phase contact in switch K1, be delayed after 250 (can be 200-300) ms, then simultaneously (or successively) closure phase-selecting switch K2
K3 is switched with three-phase synchronous operation；To make earth fault mutually be directly grounded being effectively reduced on the basis of transient current intensity,
So as to reliably extinguish electric arc.Afterwards, controller KZQ according to the second current sensor CT2 output come to singlephase earth fault
It is that transient single-phase earth fault or permanent singlephase earth fault are judged：For≤1A when (instantaneity single-phase earthing therefore
Barrier) disconnect failure phase contact, phase-selecting switch K2 and three-phase synchronous operation switch K3 in split-phase Operation switch K1, complete ground connection therefore
The processing of barrier；Otherwise (permanent singlephase earth fault) it is real to combine the differentiation to branch road zero sequence current sensor CT3-CTn outputs
Existing route selection and positioning, and three-phase synchronous operation switch K3 is disconnected, turn by Sofe Switch branch road offer metallicity single-phase earthing without electricity
Arc safe operation state, to be safely continuously customer power supply for a period of time.
Obviously, those skilled in the art can carry out various changes and modification to line-selected earthing device of the present utility model
Without departing from spirit and scope of the present utility model.So, if belonging to this reality to these modifications and variations of the present utility model
Within the scope of new claim and its equivalent technologies, then the utility model is also intended to exist comprising these changes and modification
It is interior.
Claims (8)
1. a kind of line-selected earthing device, including the grounding transformer being serially connected between bus terminal (A-B-C) and ground terminal (D)
And voltage sensor (PT), and the controller electrically connected with branch road zero sequence current sensor (CT3-CTn) secondary side (B)
(KZQ), wherein, the secondary side of voltage sensor (PT) electrically connects with the input of controller (KZQ), it is characterised in that：
The grounding transformer (B) electrically connected with being serially connected with its control terminal between bus terminal (A-B-C) with controller (KZQ) three
Phase same period Operation switch (K3)；
Split-phase Operation switch (K1), impedor (R1) and second are serially connected between the bus terminal (A-B-C) and ground terminal (D)
Current sensor (CT2), wherein, the both ends of impedor (R1) are parallel with phase-selecting switch (K2), the split-phase Operation switch (K1)
Electrically connected with the control terminal of phase-selecting switch (K2) with the output end of controller (KZQ), the two of second current sensor (CT2)
Secondary side electrically connects with the input of controller (KZQ), for when voltage sensor (PT) monitor occur singlephase earth fault after,
Controller (KZQ) first closes the failure phase contact in split-phase Operation switch (K1), is closed again phase-selecting switch (K2) and the three-phase same period
Operation switch (K3), afterwards, according to the second current sensor (CT2) output, to disconnect split-phase Operation switch (K1) during≤1A
In failure phase contact, phase-selecting switch (K2) and three-phase synchronous operation switch (K3), otherwise combine to branch road zero-sequence current sense
Route selection and positioning are realized in the differentiation of device (CT3-CTn) output, and disconnect three-phase synchronous operation switch (K3).
2. line-selected earthing device according to claim 1, it is characterized in that the neutral point and ground terminal of grounding transformer (B)
(D) the first current sensor that current-limiting resistors (R2) and secondary side electrically connect with the input of controller (KZQ) is concatenated between
(CT1)。
3. line-selected earthing device according to claim 1, it is characterized in that the operation of three-phase synchronous operation switch (K3), split-phase is opened
Bus isolating switch (A0) is serially connected between pass (K1), voltage sensor (PT) and bus terminal (A-B-C).
4. line-selected earthing device according to claim 1, it is characterized in that branch road zero sequence current sensor (CT3-CTn) and branch
Branch road disconnecting switch (A1-An) is serially connected between road bus terminal (ZA-ZB-ZC).
5. line-selected earthing device according to claim 1, it is characterized in that voltage sensor (PT) is resitstance voltage divider, or electricity
Hold divider, or electromagnetic potential transformer, or capacitance type potential transformer, or Hall voltage sensor.
6. line-selected earthing device according to claim 1, it is characterized in that the first current sensor (CT1), the second electric current pass
Sensor (CT2) is current divider, or electromagnetic current transducer, or electronic current mutual inductor, or fibre optic current sensor.
7. line-selected earthing device according to claim 1, it is characterized in that impedor (R1) is resistor, inductor, electric capacity
Tandem devices more than one or both of device.
8. line-selected earthing device according to claim 1, it is characterized in that controller (KZQ) is microcomputer, or monolithic
Machine, or digital signal processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720251991.XU CN206773117U (en) | 2017-03-13 | 2017-03-13 | Line-selected earthing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720251991.XU CN206773117U (en) | 2017-03-13 | 2017-03-13 | Line-selected earthing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206773117U true CN206773117U (en) | 2017-12-19 |
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ID=60631978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720251991.XU Active CN206773117U (en) | 2017-03-13 | 2017-03-13 | Line-selected earthing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109462220A (en) * | 2018-12-07 | 2019-03-12 | 贵州电网有限责任公司 | A kind of pro-active intervention formula extinguishing arc selection method counted and phase selection fails |
-
2017
- 2017-03-13 CN CN201720251991.XU patent/CN206773117U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109462220A (en) * | 2018-12-07 | 2019-03-12 | 贵州电网有限责任公司 | A kind of pro-active intervention formula extinguishing arc selection method counted and phase selection fails |
| CN109462220B (en) * | 2018-12-07 | 2019-12-31 | 贵州电网有限责任公司 | Active intervention type arc extinction and line selection method considering phase selection failure |
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