CN207200270U - A kind of transformer neutral point DC magnetic biasing earthing or grounding means - Google Patents
A kind of transformer neutral point DC magnetic biasing earthing or grounding means Download PDFInfo
- Publication number
- CN207200270U CN207200270U CN201721137987.7U CN201721137987U CN207200270U CN 207200270 U CN207200270 U CN 207200270U CN 201721137987 U CN201721137987 U CN 201721137987U CN 207200270 U CN207200270 U CN 207200270U
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- China
- Prior art keywords
- neutral point
- capacitor
- switch
- leading
- out terminal
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- Expired - Fee Related
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Abstract
It the utility model is related to a kind of transformer neutral point DC magnetic biasing earthing or grounding means, including disconnecting switch G1, electric discharge damper RL, capacitor C, high-speed eddy switch K0 and nonlinear resistance FR；The disconnecting switch G1, its inlet wire terminate the neutral point of three-phase transformer, and its leading-out terminal is connected with high-speed eddy switch K0 end of incoming cables, electric discharge damper RL end of incoming cables, nonlinear resistance FR end of incoming cables respectively；The outlet terminating capacitor C of electric discharge damper RL end of incoming cables；Common ground after leading-out terminal, capacitor C leading-out terminal and the nonlinear resistance FR leading-out terminal of the high-speed eddy switch K0 links together.From above technical scheme, the utility model has the advantages that security is higher, blocking efficiency is higher, stable and reliable operation, service life are long, it is ensured that the safe and reliable operation of transformer neutral point.
Description
Technical field
It the utility model is related to network transformer neutral point technical field, and in particular to a kind of direct current based on LC concussions is opened
Disconnected system.
Background technology
With the development of high pressure and extra-high voltage direct-current transmission technology in China, the DC engineering to put 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
The direct current field constant into one, is distributed in that direct current connects circumpolar AC Substation and power plant is in different direct currents
In potential point, direct current potential difference be present 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, ground resistance etc. form DC loop between standing, and cause DC current to flow through main transformer, through neutral point or through main transformer pressure
Device neutral point inflow transformer.When D.C. magnetic biasing occurs for transformer, the exciting current harmonic of transformer will sharply increase, iron
Heart saturation, temperature rise, noise and vibration increase, and higher hamonic wave is produced, endanger the stable operation of transformer and power system.
Currently used D.C. magnetic biasing isolating device is all to carry out direct shorted capacitor, this D.C. magnetic biasing by switching
Injury of the isolating device to capacitor is larger, reduces the normal service life of capacitor, influences making for D.C. magnetic biasing isolating device
Use the life-span.
Utility model content
The purpose of this utility model is to provide a kind of transformer neutral point DC magnetic biasing earthing or grounding means, and the device has peace
It is complete that property is higher, blocking efficiency is higher, stable and reliable operation, long service life the advantages that, it is ensured that transformer neutral point safely may be used
The operation leaned on.
To achieve the above object, the utility model employs following technical scheme：
A kind of transformer neutral point DC magnetic biasing earthing or grounding means, including disconnecting switch G1, electric discharge damper RL, capacitor C,
High-speed eddy switchs K0 and nonlinear resistance FR；The disconnecting switch G1, its inlet wire terminate the neutral point of three-phase transformer, its
Leading-out terminal switchs K0 end of incoming cables, electric discharge damper RL end of incoming cables, nonlinear resistance FR end of incoming cables with high-speed eddy respectively
It is connected；The outlet terminating capacitor C of electric discharge damper RL end of incoming cables；Leading-out terminal, the electricity of the high-speed eddy switch K0
Common ground after container C leading-out terminal and nonlinear resistance FR leading-out terminal link together.The disconnecting switch G1, for stopping
It is electrically isolated.The electric discharge damper RL, for capacitor C overvoltage repid discharges.The high-speed eddy switchs K0, for quickly moving back
Go out capacitor C.Described nonlinear resistance FR, connected for limiting capacitance device C after short circuit with electric discharge damper RL the electricity at both ends
Pressure, effectively prevent capacitor C from being damaged, quick protective condenser C because of overvoltage.
Further, the electric discharge damper RL includes the inductance L and resistance R being connected in parallel.
Further, the high-speed eddy switch K0 uses vacuum extinction breaker.The switch passes through installed in power distribution cabinet
In controller control it to cut-off.
Further, the disconnecting switch G1 is connected with the operating mechanism in power distribution cabinet, passes through manual control
Disconnecting switch G1's cut-offs.
From above technical scheme, the utility model have security is higher, blocking efficiency is higher, it is stable can
Lean on, the advantages that service life is long, it is ensured that the safe and reliable operation of transformer neutral point.When the direct current of three-phase transformer neutral point
When electric current exceedes setting value, system immediately accesses D.C. magnetic biasing isolation earthing or grounding means described in the utility model, so as to suppress straight
Flow electric current and flow into main transformer neutral point.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
The utility model is described further below in conjunction with the accompanying drawings：
A kind of transformer neutral point DC magnetic biasing earthing or grounding means as shown in Figure 1, including disconnecting switch G1, electric discharge damper
RL, capacitor C, high-speed eddy switch K0 and nonlinear resistance FR；The disconnecting switch G1, its inlet wire termination three-phase transformer
Neutral point, its leading-out terminal end of incoming cables, electric discharge damper RL end of incoming cables, nonlinear resistance with high-speed eddy switch K0 respectively
FR end of incoming cables is connected；The outlet terminating capacitor C of electric discharge damper RL end of incoming cables；The high-speed eddy switch K0's
Common ground after the leading-out terminal of leading-out terminal, capacitor C leading-out terminal and nonlinear resistance FR links together.The disconnecting switch
G1, isolate for having a power failure.The electric discharge damper RL, for capacitor C overvoltage repid discharges.The high-speed eddy switchs K0,
For quickly exiting capacitor C.Described nonlinear resistance FR, gone here and there for limiting capacitance device C after short circuit and electric discharge damper RL
Join the voltage at both ends, effectively prevent capacitor C from being damaged, quick protective condenser C because of overvoltage.
Further, the electric discharge damper RL includes the inductance L and resistance R being connected in parallel.
Further, the high-speed eddy switch K0 uses vacuum extinction breaker.The switch passes through installed in power distribution cabinet
In controller control it to cut-off.
Further, the disconnecting switch G1 is connected with the operating mechanism in power distribution cabinet, passes through manual control
Disconnecting switch G1's cut-offs.
Operation principle of the present utility model is：
When the DC current of three-phase transformer neutral point exceedes setting value, high-speed eddy switch K0 can receive separating brake letter
Number, the separating brake in 2ms, i.e. system immediately access capacitor D.C. magnetic biasing isolation earthed system, play and suppress DC current inflow
The effect of main transformer neutral point.Under the utility model is in running order, during line failure, transformer neutral point is handed over
When stream electric current exceedes setting value, high-speed eddy switch K0 can receive switching signal, can be effective by capacitor C short circuits in 2ms
Prevent capacitor C from being damaged due to overvoltage.After capacitor C is shorted protection, electric discharge damper RL is used to limit to capacitor C
Discharge impact electric current, prevent capacitor C from being damaged due to excessively stream.After capacitor C is shorted, transformer neutral point turns immediately
To be directly grounded state, with the transient voltage on suppression capacitor C, capacitor C puts into operation again after failture evacuation.
Embodiment described above is only that preferred embodiment of the present utility model is described, not to this practicality
New scope is defined, and on the premise of the utility model design spirit is not departed from, those of ordinary skill in the art are to this
The various modifications and improvement that the technical scheme of utility model is made, the protection of the utility model claims book determination all should be fallen into
In the range of.
Claims (3)
- A kind of 1. transformer neutral point DC magnetic biasing earthing or grounding means, it is characterised in that：Including disconnecting switch G1, electric discharge damper RL, capacitor C, high-speed eddy switch K0 and nonlinear resistance FR；The disconnecting switch G1, its inlet wire termination three-phase transformer Neutral point, its leading-out terminal end of incoming cables, electric discharge damper RL end of incoming cables, nonlinear resistance with high-speed eddy switch K0 respectively FR end of incoming cables is connected；The outlet terminating capacitor C of electric discharge damper RL end of incoming cables；The high-speed eddy switch K0's Common ground after the leading-out terminal of leading-out terminal, capacitor C leading-out terminal and nonlinear resistance FR links together.
- A kind of 2. transformer neutral point DC magnetic biasing earthing or grounding means according to claim 1, it is characterised in that：The electric discharge Damper RL includes the inductance L and resistance R being connected in parallel.
- A kind of 3. transformer neutral point DC magnetic biasing earthing or grounding means according to claim 1, it is characterised in that：The high speed Vortex switch K0 uses vacuum extinction breaker, and the switch controls it to cut-off by the controller in power distribution cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721137987.7U CN207200270U (en) | 2017-09-06 | 2017-09-06 | A kind of transformer neutral point DC magnetic biasing earthing or grounding means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721137987.7U CN207200270U (en) | 2017-09-06 | 2017-09-06 | A kind of transformer neutral point DC magnetic biasing earthing or grounding means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207200270U true CN207200270U (en) | 2018-04-06 |
Family
ID=61791514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721137987.7U Expired - Fee Related CN207200270U (en) | 2017-09-06 | 2017-09-06 | A kind of transformer neutral point DC magnetic biasing earthing or grounding means |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207200270U (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 |
-
2017
- 2017-09-06 CN CN201721137987.7U patent/CN207200270U/en not_active Expired - Fee Related
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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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: 20180406 Termination date: 20210906 |