CN207612047U - 6-10kV isolated neutral systems inhibit the combined device of arc grounding over-voltage - Google Patents
6-10kV isolated neutral systems inhibit the combined device of arc grounding over-voltage Download PDFInfo
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- CN207612047U CN207612047U CN201721616640.0U CN201721616640U CN207612047U CN 207612047 U CN207612047 U CN 207612047U CN 201721616640 U CN201721616640 U CN 201721616640U CN 207612047 U CN207612047 U CN 207612047U
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- zero sequence
- sequence current
- power distribution
- distribution station
- arc
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Abstract
The utility model is a kind of 6 10kV isolated neutral systems inhibition combined device of arc grounding over-voltage, and arc-extinction device, arc-extinction device ground connection are installed on level-one power distribution station institute main line；Level-one power distribution station and two level power distribution station between electric power incoming line install casing Zero sequence current differential protection device; Zero sequence current differential protection device includes casing zero sequence current mutual inductor, relay protector, optical fiber; casing zero sequence current mutual inductor is mounted in electric power incoming line both ends; casing zero sequence current mutual inductor respectively connects relay protector, passes through fiber optic communication between relay protector；Fill apparatus for fast switching on two level power distribution station institute main line, two level power distribution station allot zero sequence power direction protector be installed on open circuit.Advantageous effect：Fault point is quickly cut off when isolated neutral system single-phase earthing to realize, and inhibits overvoltage by zero sequence power direction protection, Zero sequence current differential protection, arc-extinction device, apparatus for fast switching cooperation, while being ensured for electrically continuous reliable.
Description
Technical field
The utility model belongs to the breakdown judge of high-tension transmission equipment, protection equipment technical field, is related to power industry
Middle 6-10kV isolated neutral systems inhibit the processing unit of arc grounding over-voltage.
Background technology
It is using arc suppression coil, arc-extinction device, earthing wire-selecting that power industry 6-10kV tradition, which inhibits arc grounding over-voltage,
Device, protective relaying device come solve the problems, such as in isolated neutral system be grounded arc overvoltage and single-phase earthing, each device it is relatively only
It is vertical, and influence each other, occur the problem of different type in operational process, it has also become the persistent ailment of isolated neutral system safe operation.
Utility model content
The utility model is to solve above-mentioned technical barrier, proposes that a kind of 6-10kV isolated neutral systems inhibit arc grounding mistake
Voltage combination device.
The technical solution that the utility model is taken：A kind of 6-10kV isolated neutral systems inhibition arc grounding over-voltage combination
Type device installs arc-extinction device, arc-extinction device ground connection on level-one power distribution station institute main line；In level-one power distribution station institute's main line and two level
Electric power incoming line between power distribution station institute main line installs casing Zero sequence current differential protection device, Zero sequence current differential protection device packet
Casing zero sequence current mutual inductor, relay protector, optical fiber are included, casing zero sequence current mutual inductor is mounted in electric power incoming line both ends, casing
Zero sequence current mutual inductor respectively connects relay protector, passes through fiber optic communication between relay protector；It is led in two level power distribution station
Apparatus for fast switching is filled on line, allotting for two level power distribution station institute main line is equipped with zero sequence power direction protector on open circuit.
Further, the relay protector is also connected with master control platform.
The beneficial effects of the utility model：By zero sequence power direction protection, Zero sequence current differential protection, arc-extinction device,
Apparatus for fast switching cooperation quickly cuts off fault point to realize when isolated neutral system single-phase earthing, and inhibits overvoltage, protects simultaneously
Testimony is electrically continuous reliable.The utility model cuts off failure by zero-sequence current protection, matches to be formed with arc-extinction device and inhibited
The dual measure of voltage.
Description of the drawings
Fig. 1 is isolated neutral system normal operating mode schematic diagram；
Fig. 2 is method of operation schematic diagram after isolated neutral system electric power incoming line singlephase earth fault；
Fig. 3 is that isolated neutral system allots method of operation schematic diagram after open circuit singlephase earth fault；
1- level-ones power distribution station institute main line, 2- arc-extinction devices, 3- two levels power distribution station institute main line, 4- electric power incoming lines, 5- casings zero
Sequence current transformer, 6- relay protectors, 7- optical fiber, 8- apparatus for fast switching, 9- zero sequence power direction protectors.
Specific implementation mode
Such as figure, a kind of 6-10kV isolated neutral systems inhibition combined device of arc grounding over-voltage, in level-one power distribution station institute
Arc-extinction device 2 is installed, arc-extinction device 2 is grounded, real-time collection voltages on main line 1；In level-one power distribution station institute main line 1 and two level distribution
The electric power incoming line 4 stood between institute's main line 3 installs casing Zero sequence current differential protection device, and Zero sequence current differential protection device includes
Casing zero sequence current mutual inductor 5, relay protector 6, optical fiber 7, casing zero sequence current mutual inductor 5 are mounted in 4 both ends of electric power incoming line, set
Pipe zero sequence current mutual inductor 5 respectively connects relay protector 6, is communicated by optical fiber 7 between relay protector 6, what both ends measured
Electric current is compared, if there is difference, is started Zero sequence current differential protection, is cut off faulty line；In two level power distribution station institute main line 3
Upper dress apparatus for fast switching 8, allotting for two level power distribution station institute main line 3 are equipped with zero sequence power direction protector 9 on open circuit.It is described
Relay protector 6 is also connected with master control platform, the variation of master control platform record current.
The engagement process of a component part of the device：First with zero sequence power direction in 6-10kV isolated neutral systems
Protector, the excision of casing Zero sequence current differential protection device find singlephase earth fault, secondly disappear using using arc-extinction device
Except arc overvoltage, relay protector cooperates with arc-extinction device, realizes that 6-10kV isolated neutral systems inhibit arc grounding mistake
Voltage and excision（Or it finds）Fault point ensures power distribution system secure continuous service.
Earth-free distribution system when Fig. 1 is normal operation.Fig. 2 is to be run after one singlephase earth fault of electric power incoming line is cut off
Mode, what virtual coil was irised out is the electric power incoming line of tripping, and faulty line, fault wire are cut off by Zero sequence current differential protection device
Road is tripped, and busbar breaker is closed in the power supply rapid switching device action of two level power distribution station institute, ensures that secondary station supplies electrically continuous, level-one
Institute's arc-extinction device of standing lags behind the Zero sequence current differential protection of Zero sequence current differential protection device, is not released in system single-phase earthing
When form metallic earthing and inhibit arc overvoltage.After Fig. 3 allots open circuit singlephase earth fault excision by two level power distribution station
The method of operation, what virtual coil was irised out be tripping allot open circuit, pass through zero sequence power direction protector excision faulty line, failure
Line tripping, arc-extinction device lag behind zero-sequence current directional power protection, and metallicity is formed when system single-phase earthing does not release
It is grounded to inhibit arc overvoltage.The utility model cuts off failure by zero sequence power direction protector, matches with arc-extinction device
Close the dual measure for being formed and inhibiting overvoltage.
Claims (2)
1. a kind of 6-10kV isolated neutral systems inhibit the combined device of arc grounding over-voltage, it is characterized in that：In level-one power distribution station
Institute's main line（1）Upper installation arc-extinction device（2）, arc-extinction device（2）Ground connection；In level-one power distribution station institute main line（1）With two level power distribution station
Institute's main line（3）Between electric power incoming line（4）Casing Zero sequence current differential protection device, Zero sequence current differential protection device packet are installed
Include casing zero sequence current mutual inductor（5）, relay protector（6）, optical fiber（7）, casing zero sequence current mutual inductor（5）Mounted in power supply into
Line（4）Both ends, casing zero sequence current mutual inductor（5）Respectively connection relay protector（6）, relay protector（6）Between pass through light
It is fine（7）Communication；In two level power distribution station institute main line（3）Upper dress apparatus for fast switching（8）, two level power distribution station institute main line（3）Allot
Zero sequence power direction protector is installed on open circuit（9）.
2. a kind of 6-10kV isolated neutral systems according to claim 1 inhibit the combined device of arc grounding over-voltage,
It is characterized in：The relay protector（6）Also connected with master control platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721616640.0U CN207612047U (en) | 2017-11-28 | 2017-11-28 | 6-10kV isolated neutral systems inhibit the combined device of arc grounding over-voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721616640.0U CN207612047U (en) | 2017-11-28 | 2017-11-28 | 6-10kV isolated neutral systems inhibit the combined device of arc grounding over-voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207612047U true CN207612047U (en) | 2018-07-13 |
Family
ID=62796272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721616640.0U Expired - Fee Related CN207612047U (en) | 2017-11-28 | 2017-11-28 | 6-10kV isolated neutral systems inhibit the combined device of arc grounding over-voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207612047U (en) |
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2017
- 2017-11-28 CN CN201721616640.0U patent/CN207612047U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180713 Termination date: 20181128 |