CN106921151A - A kind of D.C. magnetic biasing isolation earthed system based on capacitor - Google Patents
A kind of D.C. magnetic biasing isolation earthed system based on capacitor Download PDFInfo
- Publication number
- CN106921151A CN106921151A CN201710279489.4A CN201710279489A CN106921151A CN 106921151 A CN106921151 A CN 106921151A CN 201710279489 A CN201710279489 A CN 201710279489A CN 106921151 A CN106921151 A CN 106921151A
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- China
- Prior art keywords
- capacitor
- leading
- out terminal
- switch
- incoming cables
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
Abstract
Isolate earthed system, including capacitor C, disconnecting switch G1, electric discharge damper RL, high-speed eddy switch K0 and controllable silicon SCR the present invention relates to a kind of D.C. magnetic biasing based on capacitor；The end of incoming cables of the disconnecting switch G1 is connected with the neutral point of transformer, and the leading-out terminal of disconnecting switch G1 is connected with the end of incoming cables of capacitor C, the leading-out terminal ground connection of capacitor C；The controllable silicon SCR is in parallel with capacitor C；The end of incoming cables of the inlet wire terminating capacitor C of the electric discharge damper RL, the leading-out terminal of electric discharge damper RL is connected with the end of incoming cables of high-speed eddy switch K0, and the leading-out terminal of high-speed eddy switch K0 is connected with the leading-out terminal of capacitor C.The present invention has that security is higher, blocking efficiency is higher, and it is to effect on power system very little, it is ensured that transformer neutral point is small impedance earth.
Description
Technical field
The present invention relates to network transformer neutral point technical field, especially a kind of D.C. magnetic biasing isolation based on capacitor
Earthed system.
Background technology
As high pressure and extra-high voltage direct-current transmission technology are in the development of China, the DC engineering for putting into operation is increasing.
When DC transmission system uses the monopolar ground return method of operation, the grounded pole injection the earth of electric current, the shape in the soil of pole location
Into a constant direct current field, it is distributed in direct current and connects circumpolar AC Substation and power plant in different direct currents
In potential point, there is direct current potential difference between main electrical scheme earth mat in each station.If there is alternating current circuit to be connected between two stations, and two stations
Main transformer neutral point is directly grounded, then in two stations between main grounding grid will by main transformer neutral point, station equipment line,
Alternating current circuit between standing, resistance etc. form DC loop, cause DC current to flow through main transformer, through neutral point or through main transformer pressure
Device neutral point inflow transformer.When transformer occurs D.C. magnetic biasing, the exciting current harmonic of transformer will be sharply increased, iron
Heart saturation, temperature rise, noise and vibration increase, and higher hamonic wave is produced, the stable operation of harm transformer and power system.
The D.C. magnetic biasing isolating device that existing market is used all is to carry out direct shorted capacitor, this direct current by switch
Injury of the magnetic bias isolating device to capacitor is larger, reduces the normal service life of capacitor, influences D.C. magnetic biasing isolating device
Service life.
The content of the invention
It is an object of the invention to provide a kind of when the DC current of transformer neutral point exceedes setting value, system is immediately
D.C. magnetic biasing isolation earthed system is accessed, so as to suppress the direct current based on capacitor that DC current flows into main transformer neutral point
Magnetic bias isolates earthed system.
To achieve the above object, present invention employs following technical scheme：A kind of D.C. magnetic biasing isolation based on capacitor
Earthed system, including capacitor C, the disconnecting switch G1 for the isolation that has a power failure, the electric discharge resistance for capacitor C overvoltage repid discharges
Buddhist nun's device RL, the high-speed eddy switch K0 for quickly exiting capacitor C, and for the controllable silicon of quick protective condenser C
SCR；The end of incoming cables of the disconnecting switch G1 is connected with the neutral point of transformer, and the leading-out terminal of disconnecting switch G1 is with capacitor C's
End of incoming cables is connected, the leading-out terminal ground connection of capacitor C；The controllable silicon SCR is in parallel with capacitor C；The electric discharge damper RL
Inlet wire terminating capacitor C end of incoming cables, the end of incoming cables that the leading-out terminal of electric discharge damper RL switchs K0 with high-speed eddy is connected,
The leading-out terminal of high-speed eddy switch K0 is connected with the leading-out terminal of capacitor C.
The end of incoming cables of the controllable silicon SCR is connected with the end of incoming cables of capacitor C, leading-out terminal and the capacitor C of controllable silicon SCR
Leading-out terminal be connected, the controllable silicon SCR controls it to cut-off by the controller in power distribution cabinet.
The electric discharge damper RL is in parallel and is constituted by inductance L and resistance R.
The disconnecting switch G1 is connected with the operating mechanism in power distribution cabinet, by artificial control disconnecting switch G1
Cut-off.
The high-speed eddy switch K0 is vacuum extinction breaker, and high-speed eddy switchs K0 by power distribution cabinet
Controller control it to cut-off.
As shown from the above technical solution, the present invention has that security is higher, blocking efficiency higher, stable and reliable operation, makes
The advantages of using long lifespan, and to effect on power system very little, it is ensured that transformer neutral point is small impedance earth.
Brief description of the drawings
Fig. 1 is electrical schematic diagram of the invention.
Specific embodiment
As shown in figure 1, it is a kind of based on capacitor D.C. magnetic biasing isolation earthed system, including capacitor C, for have a power failure every
From disconnecting switch G1, for capacitor C overvoltage repid discharge electric discharge damper RL, the height for quickly exiting capacitor C
Speed vortex switch K0, and for the controllable silicon SCR of quick protective condenser C；The end of incoming cables of the disconnecting switch G1 and transformation
The neutral point connection of device, the leading-out terminal of disconnecting switch G1 is connected with the end of incoming cables of capacitor C, the leading-out terminal ground connection of capacitor C；
The controllable silicon SCR is in parallel with capacitor C；The end of incoming cables of the inlet wire terminating capacitor C of the electric discharge damper RL, electric discharge damping
The leading-out terminal of device RL is connected with the end of incoming cables of high-speed eddy switch K0, and the leading-out terminal of high-speed eddy switch K0 is with capacitor C's
Leading-out terminal is connected.
As shown in figure 1, the end of incoming cables of the controllable silicon SCR is connected with the end of incoming cables of capacitor C, the outlet of controllable silicon SCR
End is connected with the leading-out terminal of capacitor C, and the controllable silicon SCR controls it to cut-off by the controller in power distribution cabinet.Institute
Electric discharge damper RL is stated to be in parallel and constituted by inductance L and resistance R.The disconnecting switch G1 and the operation machine being arranged in power distribution cabinet
Structure is connected, by cut-offfing for artificial control disconnecting switch G1.The high-speed eddy switch K0 is vacuum extinction breaker, at a high speed
Vortex switch K0 controls it to cut-off by the controller in power distribution cabinet.
Operation principle of the invention is as follows：When transformer neutral point DC current exceedes setting value, high-speed eddy switch
Separating brake, i.e. system immediately access capacitor D.C. magnetic biasing isolation earthed system to K0 immediately, play suppression DC current and flow into main transformer
The effect of depressor neutral point；
Under device is in running order, during line failure, when transformer neutral point alternating current exceedes setting value, system
Middle controller sends reclosing command to controllable silicon SCR and high-speed eddy switch K0 immediately, and controllable silicon SCR is in 200us by electric capacity
Device C short circuits, high-speed eddy switchs K0 in 2ms by capacitor C short circuits, after high-speed eddy switch K0 closes a floodgate, by high-speed eddy
Switch K0 continues shorted capacitor C, realizes the duplicate protection of capacitor C；The double of K0 are switched by controllable silicon SCR and high-speed eddy
Protect again, can effectively prevent capacitor C from being damaged due to overvoltage；
After capacitor C is protected, electric discharge damper RL is used to limit the discharge impact electric current to capacitor C, prevents capacitor C
Damaged due to excessively stream；After capacitor C is shorted, transformer neutral point switchs to be directly grounded state immediately, to suppress electric capacity
Transient voltage on device C, capacitor C puts into operation again after failture evacuation.
In sum, the present invention has that security is higher, blocking efficiency is higher, and it can be protected to effect on power system very little
Card transformer neutral point is small impedance earth.
Claims (5)
1. a kind of D.C. magnetic biasing based on capacitor isolates earthed system, it is characterised in that：Including capacitor C, for have a power failure every
From disconnecting switch G1, for capacitor C overvoltage repid discharge electric discharge damper RL, the height for quickly exiting capacitor C
Speed vortex switch K0, and for the controllable silicon SCR of quick protective condenser C；The end of incoming cables of the disconnecting switch G1 and transformation
The neutral point connection of device, the leading-out terminal of disconnecting switch G1 is connected with the end of incoming cables of capacitor C, the leading-out terminal ground connection of capacitor C；
The controllable silicon SCR is in parallel with capacitor C；The end of incoming cables of the inlet wire terminating capacitor C of the electric discharge damper RL, electric discharge damping
The leading-out terminal of device RL is connected with the end of incoming cables of high-speed eddy switch K0, and the leading-out terminal of high-speed eddy switch K0 is with capacitor C's
Leading-out terminal is connected.
2. the D.C. magnetic biasing based on capacitor according to claim 1 isolates earthed system, it is characterised in that：It is described controllable
The end of incoming cables of silicon SCR is connected with the end of incoming cables of capacitor C, and the leading-out terminal of controllable silicon SCR is connected with the leading-out terminal of capacitor C, institute
State controllable silicon SCR controls it to cut-off by the controller in power distribution cabinet.
3. the D.C. magnetic biasing based on capacitor according to claim 1 isolates earthed system, it is characterised in that：The electric discharge
Damper RL is in parallel and is constituted by inductance L and resistance R.
4. the D.C. magnetic biasing based on capacitor according to claim 1 isolates earthed system, it is characterised in that：The isolation
Switch G1 is connected with the operating mechanism in power distribution cabinet, by cut-offfing for artificial control disconnecting switch G1.
5. the D.C. magnetic biasing based on capacitor according to claim 1 isolates earthed system, it is characterised in that：The high speed
Vortex switch K0 is vacuum extinction breaker, and high-speed eddy switch K0 controls it to open by the controller in power distribution cabinet
It is disconnected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710279489.4A CN106921151A (en) | 2017-04-25 | 2017-04-25 | A kind of D.C. magnetic biasing isolation earthed system based on capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710279489.4A CN106921151A (en) | 2017-04-25 | 2017-04-25 | A kind of D.C. magnetic biasing isolation earthed system based on capacitor |
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| Publication Number | Publication Date |
|---|---|
| CN106921151A true CN106921151A (en) | 2017-07-04 |
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ID=59567511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710279489.4A Pending CN106921151A (en) | 2017-04-25 | 2017-04-25 | A kind of D.C. magnetic biasing isolation earthed system based on capacitor |
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| CN (1) | CN106921151A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508269A (en) * | 2017-09-06 | 2017-12-22 | 安徽徽电科技股份有限公司 | A kind of transformer neutral point DC magnetic biasing earthing or grounding means |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1967957A (en) * | 2006-11-24 | 2007-05-23 | 华中科技大学 | Direct current current-limiting device of neutral point of grounding transformer |
| CN103683194A (en) * | 2013-12-17 | 2014-03-26 | 国家电网公司 | Transformer neutral point direct current suppression device |
| CN106099938A (en) * | 2016-06-24 | 2016-11-09 | 安徽尚途电力保护设备有限公司 | A kind of high-voltage fence series compensation device |
| CN205724858U (en) * | 2016-06-16 | 2016-11-23 | 安徽徽电科技股份有限公司 | A kind of series resonance bus residual voltage holding means |
| CN206759044U (en) * | 2017-04-25 | 2017-12-15 | 安徽伊格瑞德电气设备有限公司 | A kind of D.C. magnetic biasing isolation earthed system based on capacitor |
-
2017
- 2017-04-25 CN CN201710279489.4A patent/CN106921151A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1967957A (en) * | 2006-11-24 | 2007-05-23 | 华中科技大学 | Direct current current-limiting device of neutral point of grounding transformer |
| CN103683194A (en) * | 2013-12-17 | 2014-03-26 | 国家电网公司 | Transformer neutral point direct current suppression device |
| CN205724858U (en) * | 2016-06-16 | 2016-11-23 | 安徽徽电科技股份有限公司 | A kind of series resonance bus residual voltage holding means |
| CN106099938A (en) * | 2016-06-24 | 2016-11-09 | 安徽尚途电力保护设备有限公司 | A kind of high-voltage fence series compensation device |
| CN206759044U (en) * | 2017-04-25 | 2017-12-15 | 安徽伊格瑞德电气设备有限公司 | A kind of D.C. magnetic biasing isolation earthed system based on capacitor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508269A (en) * | 2017-09-06 | 2017-12-22 | 安徽徽电科技股份有限公司 | A kind of transformer neutral point DC magnetic biasing earthing or grounding means |
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Application publication date: 20170704 |
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