CN207424166U - Distributed line-selected earthing device - Google Patents
Distributed line-selected earthing device Download PDFInfo
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- CN207424166U CN207424166U CN201721346152.2U CN201721346152U CN207424166U CN 207424166 U CN207424166 U CN 207424166U CN 201721346152 U CN201721346152 U CN 201721346152U CN 207424166 U CN207424166 U CN 207424166U
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- photoelectric converter
- voltage
- sensor
- current
- electrically connected
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Abstract
The utility model discloses a kind of distributed line-selected earthing devices.It includes first line of a couplet busbar (1),The voltage sensor (PT1 PTn) that the two level busbar (21 2n) of second line of a couplet branch (31 3n) bridges between ground,The current sensor (CT1 CTn) concatenated in the circuit of branch (31 3n),And the monitoring part (8) being electrically connected with voltage sensor (PT1 PTn) and current sensor (CT1 CTn),The output terminal of voltage sensor (PT1 PTn) is electrically connected with voltage photoelectric converter (41 4n),The output terminal of current sensor (CT1 CTn) is electrically connected with electric current photoelectric converter (51 5n),The input/output terminal of monitoring part (8) is electrically connected with photoelectric converter (7),Photoelectric converter (7) is connected through optical fiber (6) with voltage photoelectric converter (41 4n) and electric current photoelectric converter (51 5n) respectively.It can be used for the accurate route selection to singlephase earth fault in the system that 3 66kV neutral points are not directly grounded.
Description
Technical field
The utility model is related to a kind of line-selected earthing device, especially a kind of distributed line-selected earthing device.
Background technology
In the power supply-distribution system not being directly grounded in the 3-66kV neutral points in China, singlephase earth fault is a kind of common
Failure.At present, people are to handle this kind of failure in time, often configure in systems mainly by first line of a couplet busbar, second line of a couplet branch
Two level busbar is connected to voltage sensor with ground span, and current sensor and and voltage sensor are serially connected in the circuit of branch
With the earth fault line selection device for low current of the monitoring part composition of current sensor electrical connection；During route selection, mostly using power side
To, selection methods such as wavelet algorithm, transient method, also have in the variant projects of location of arc suppression coil parallel medium resistance.Though this device
Route selection can be carried out to singlephase earth fault, but also there is shortcomings：When earth fault occurs for system, because of the mistake of its generation
Voltge surge and strong electromagnetic are very big, and the electric signal, monitoring part easily to voltage sensor and current sensor output are defeated
The electric signal for entering output generates greatly interference, particularly multistage busbar and branch be more and the system of distribution distance farther out in,
The electric signal of transmission is not only vulnerable to the interference of strong electromagnetic due to communication cable is longer, and signal is also easily decayed, and communication cable is to passing
The frequency of defeated signal is more restricted, ultimately results in route selection and larger deviation occurs --- the accuracy rate of route selection is low, earthing position without
Method judges in time.
Utility model content
The technical problems to be solved in the utility model provides a kind of anti-interference energy to overcome shortcoming of the prior art
The distributed line-selected earthing device that power is strong, transmitting range is remote and transmission frequency is high, data volume is big.
The technical issues of to solve the utility model, used technical solution is that distributed line-selected earthing device includes
The two level busbar of first line of a couplet busbar, second line of a couplet branch, the voltage sensor bridged between two level busbar and ground, the company of series connection in the circuit of branch
The current sensor connect and the monitoring part being electrically connected with voltage sensor and current sensor, particularly：
The output terminal of the voltage sensor is electrically connected with voltage photoelectric converter；
The output terminal of the current sensor is electrically connected with electric current photoelectric converter；
The input/output terminal of the monitoring part is electrically connected with photoelectric converter；
The photoelectric converter is connected through optical fiber with voltage photoelectric converter and electric current photoelectric converter respectively.
As being further improved for distributed line-selected earthing device：
Preferably, voltage sensor is electromagnetic potential transformer or resitstance voltage divider or capacitive divider or capacitance
Formula voltage transformer or Hall voltage sensor.
Preferably, current sensor is electromagnetic current transducer or current divider or electronic current mutual inductor or light
Fiber current sensor.
Preferably, monitoring part is comparator or microcontroller or digital signal processor or microcomputer.
Preferably, voltage photoelectric converter, electric current photoelectric converter and photoelectric converter be single mode optical fiber transceiver or
Multimode fibre transceiver.
It is compared with the advantageous effect of the prior art：
After such structure, weaker electric signal involved in the utility model both will not mistake in by power supply-distribution system
The impact of voltage and the interference of strong electromagnetic, and be not easy to decay, also there is that the band of transmission is wide, fireballing feature, make it easily
To the accurate route selection of singlephase earth fault in the system not being directly grounded in 3-66kV neutral points in widely commercial applications.
Description of the drawings
Fig. 1 is a kind of basic structure circuit diagram of the utility model.
Specific embodiment
The preferred embodiment of the utility model is described in further detail below in conjunction with the accompanying drawings.
Referring to Fig. 1, the composition of distributed line-selected earthing device is as follows：
Two level busbar (21-2n) first line of a couplet busbar 1, second line of a couplet branch (31-3n).
Two level busbar (21-2n) is connected to voltage sensor (PT1-PTn) with ground span, voltage sensor (PT1-PTn)
Output terminal is electrically connected with voltage photoelectric converter (41-4n)；Wherein, voltage sensor (PT1-PTn) is electromagnetic potential mutual inductance
Device (or resitstance voltage divider or capacitive divider or capacitance type potential transformer or Hall voltage sensor), voltage photoelectricity turn
Parallel operation (41-4n) is single mode optical fiber transceiver (or multimode fibre transceiver).
Current sensor (CT1-CTn), current sensor (CT1-CTn) are connected in series in the circuit of branch (31-3n)
Output terminal be electrically connected with electric current photoelectric converter (51-5n)；Wherein, current sensor (CT1-CTn) is mutual for electromagnetic type electric current
Sensor (or current divider or electronic current mutual inductor or fibre optic current sensor), electric current photoelectric converter (51-5n) are single
Mode fiber transceiver (or multimode fibre transceiver).
The input/output terminal of monitoring part 8 is electrically connected with photoelectric converter 7；Wherein, monitoring part 8 is microcomputer
(or comparator or microcontroller or digital signal processor), photoelectric converter 7 for single mode optical fiber transceiver (or multimode fibre receive
Send out device).
Photoelectric converter 7 through optical fiber 6 respectively with voltage photoelectric converter (41-4n) and electric current photoelectric converter (51-5n)
Connection.
In use, the electricity of each component need to be only selected applied to the voltage class in electric system according to the utility model
Gas parameter.
Obviously, those skilled in the art can carry out various changes to the distributed line-selected earthing device of the utility model
With modification without departing from the spirit and scope of the utility model.If in this way, these modifications and variations categories to the utility model
Within the scope of the utility model claims and its equivalent technologies, then the utility model is also intended to comprising these changes and becomes
Including type.
Claims (5)
1. a kind of distribution line-selected earthing device, the two level busbar (21- including first line of a couplet busbar (1), second line of a couplet branch (31-3n)
2n), the voltage sensor (PT1-PTn) that two level busbar (21-2n) bridges between ground, the company of series connection in the circuit of branch (31-3n)
It the current sensor (CT1-CTn) that connects and is electrically connected with voltage sensor (PT1-PTn) and current sensor (CT1-CTn)
Monitoring part (8), it is characterised in that：
The output terminal of the voltage sensor (PT1-PTn) is electrically connected with voltage photoelectric converter (41-4n)；
The output terminal of the current sensor (CT1-CTn) is electrically connected with electric current photoelectric converter (51-5n)；
The input/output terminal of the monitoring part (8) is electrically connected with photoelectric converter (7)；
The photoelectric converter (7) through optical fiber (6) respectively with voltage photoelectric converter (41-4n) and electric current photoelectric converter (51-
5n) connect.
2. distribution line-selected earthing device according to claim 1, it is characterized in that voltage sensor (PT1-PTn) is electromagnetism
Formula voltage transformer or resitstance voltage divider or capacitive divider or capacitance type potential transformer or Hall voltage sensor.
3. distribution line-selected earthing device according to claim 1, it is characterized in that current sensor (CT1-CTn) is electromagnetism
Formula current transformer or current divider or electronic current mutual inductor or fibre optic current sensor.
4. distribution line-selected earthing device according to claim 1, it is characterized in that monitoring part (8) is comparator or single
Piece machine or digital signal processor or microcomputer.
5. distribution line-selected earthing device according to claim 1, it is characterized in that voltage photoelectric converter (41-4n), electricity
Streamer electric transducer (51-5n) and photoelectric converter (7) are single mode optical fiber transceiver or multimode fibre transceiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721346152.2U CN207424166U (en) | 2017-10-16 | 2017-10-16 | Distributed line-selected earthing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721346152.2U CN207424166U (en) | 2017-10-16 | 2017-10-16 | Distributed line-selected earthing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207424166U true CN207424166U (en) | 2018-05-29 |
Family
ID=62311903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721346152.2U Active CN207424166U (en) | 2017-10-16 | 2017-10-16 | Distributed line-selected earthing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207424166U (en) |
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2017
- 2017-10-16 CN CN201721346152.2U patent/CN207424166U/en active Active
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