CN208433749U - A kind of transformer neutral point direct current decoupling device - Google Patents
A kind of transformer neutral point direct current decoupling device Download PDFInfo
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- CN208433749U CN208433749U CN201821003035.0U CN201821003035U CN208433749U CN 208433749 U CN208433749 U CN 208433749U CN 201821003035 U CN201821003035 U CN 201821003035U CN 208433749 U CN208433749 U CN 208433749U
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- capacitor
- speed switch
- neutral point
- transformer neutral
- direct current
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Abstract
The utility model relates to a kind of transformer neutral point direct current decoupling devices, including for the capacitor C of shielding system transformer neutral point direct current, znr MOV, current-limiting reactor L, main high-speed switch K0 and auxiliary high-speed switch K1 for quickly exiting capacitor C；The inlet wire of the capacitor C terminates transformer neutral point A, the leading-out terminal of capacitor C is grounded, the znr MOV is connected in parallel on the both ends of capacitor C, the end of incoming cables of the current-limiting reactor L is connected with the end of incoming cables of capacitor C, the leading-out terminal of current-limiting reactor L is connected with the end of incoming cables of main high-speed switch K0, the leading-out terminal of main high-speed switch K0 is connected with the leading-out terminal of capacitor C, and the auxiliary high-speed switch K1 is connected in parallel on the both ends of main high-speed switch K0.The utility model has many advantages, such as safe and reliable, simple and durable, can be effectively isolated system transformer neutral point direct current, it is ensured that transformer neutral point is small impedance earth.
Description
Technical field
The utility model relates to network transformer neutral point technical field, especially a kind of transformer neutral point direct current decoupling
Device.
Background technique
The failure of electric system and electrical equipment be largely due to caused by the damage of insulation, at present it is internationally recognized
Insulation detecting method is DC superposition method: d. c. voltage signal is superimposed upon running ac high-voltage system or electrical equipment
On, DC voltage converses the dielectric level of system over the ground by the current value that system insulation against ground generates.In high voltage power transmission system
In system, in system of the high-tension transformer neutral point through too small resistance or grounding through arc, in order to on-line real-time measuremen transmission of electricity
The dielectric level of system over the ground need to access DC isolation decoupling device between small resistance or arc suppression coil and ground connection electricity, to protect
Demonstrate,prove the normal use of on-line real-time measuremen insulator arrangement.
The DC isolation device that existing market uses all is that capacitor is directly isolated, and this DC isolation mode is to capacitor
Injury it is larger, reduce the normal service life of capacitor, influence the service life of DC isolation decoupling device.
Utility model content
The purpose of this utility model is to provide a kind of safe and reliable, simple and durable, realize that on-line real-time measuremen insulation is set
The transformer neutral point direct current decoupling device of standby normal use.
To achieve the above object, the utility model uses following technical scheme: a kind of transformer neutral point direct current decoupling
Device, including for shielding system transformer neutral point direct current capacitor C, for the overvoltage at limiting capacitance device C both ends
Znr MOV, for limiting capacitance device C be shorted after rate of discharge current-limiting reactor L, for quickly moving back
The main high-speed switch K0 and auxiliary high-speed switch K1 of capacitor C out；The inlet wire of the capacitor C terminates transformer neutral point A, capacitor
The leading-out terminal of device C is grounded, and the znr MOV is connected in parallel on the both ends of capacitor C, the current-limiting reactor L's
End of incoming cables is connected with the end of incoming cables of capacitor C, and the leading-out terminal of current-limiting reactor L is connected with the end of incoming cables of main high-speed switch K0, main
The leading-out terminal of high-speed switch K0 is connected with the leading-out terminal of capacitor C, and the auxiliary high-speed switch K1 is connected in parallel on main high-speed switch K0's
Both ends.
The main high-speed switch K0 uses vacuum extinction breaker, by being mounted on transformer neutral point direct current decoupling device
In controller control it and cut-off.
The auxiliary high-speed switch K1 uses vacuum extinction breaker, in main high-speed switch K0 failure or system electricity
When the failure of source, capacitor C is quickly exited.
As shown from the above technical solution, the utility model has the following beneficial effects: the utility model has securely and reliably, simply
The advantages that durable, it is straight to be effectively isolated system transformer neutral point by using the function of the logical exchange of capacitor C isolated DC
Stream, it is ensured that transformer neutral point is small impedance earth.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
As shown in Figure 1, a kind of transformer neutral point direct current decoupling device, including it is straight for shielding system transformer neutral point
The capacitor C of stream, for the both ends limiting capacitance device C overvoltage znr MOV, be used for limiting capacitance device C
The current-limiting reactor L of rate of discharge, main high-speed switch K0 and auxiliary high-speed switch for quickly exiting capacitor C after short circuit
K1；The inlet wire of the capacitor C terminates transformer neutral point A, the leading-out terminal ground connection of capacitor C, the zinc oxide nonlinear electricity
Resistance MOV is connected in parallel on the both ends of capacitor C, and the end of incoming cables of the current-limiting reactor L is connected with the end of incoming cables of capacitor C, current limliting electricity
The leading-out terminal of anti-device L is connected with the end of incoming cables of main high-speed switch K0, the leading-out terminal of main high-speed switch K0 and the leading-out terminal of capacitor C
It is connected, the auxiliary high-speed switch K1 is connected in parallel on the both ends of main high-speed switch K0.
As shown in Figure 1, the main high-speed switch K0 uses vacuum extinction breaker, it is straight by being mounted on transformer neutral point
Controller in stream decoupling device controls it and cut-offs.The auxiliary high-speed switch K1 uses vacuum extinction breaker, for main fast
When speed switch K0 failure or system power supply failure, capacitor C is quickly exited.The action logic of auxiliary high-speed switch K1: internal
Separating brake when controlling electric, when switch internal power loss, close a floodgate.The znr MOV is used for the both ends limiting capacitance device C
Overvoltage, prevent capacitor C from damaging because of over-voltage.The auxiliary high-speed switch K1 be used for main high-speed switch K0 break down or
When system power supply failure, capacitor C is quickly exited.
The working principle of the utility model is as follows:
When normal operation, the capacitor C transformer neutral point A for being connected in series to high pressure is connect through too small resistance or arc suppression coil
In the system on ground, pass through the direct current of capacitor C shielding system transformer neutral point A.Under device is in running order, route hair
When raw failure, when the electric current of transformer neutral point A is more than controller setting value, controller is immediately to main high-speed switch K0, auxiliary fast
Speed switch K1 issues reclosing command, after capacitor C both end voltage is more than znr MOV conducting voltage, oxidation
Zinc nonlinear resistance MOV fast conducting, the limiting capacitance both ends device C end voltage, when high-speed eddy switch K0, auxiliary high-speed switch K1 are closed
After lock, shorted capacitor C is continued by high-speed eddy switch K0, auxiliary high-speed switch K1；After capacitor C is shorted, current-limiting reactor
Device L is used for limiting capacitance device C discharge impact electric current, prevents capacitor C from damaging due to overcurrent；Pass through znr
MOV, high-speed eddy switch K0, auxiliary high-speed switch K1 multiple protective, can effectively prevent capacitor C and are damaged due to over-voltage.
In conclusion the utility model has many advantages, such as safe and reliable, simple and durable, can be effectively isolated in system transformer
Property point direct current, it is ensured that transformer neutral point be small impedance earth.
Claims (3)
1. a kind of transformer neutral point direct current decoupling device, it is characterised in that: including straight for shielding system transformer neutral point
The capacitor C of stream, for the both ends limiting capacitance device C overvoltage znr MOV, be used for limiting capacitance device C
The current-limiting reactor L of rate of discharge, main high-speed switch K0 and auxiliary high-speed switch for quickly exiting capacitor C after short circuit
K1；The inlet wire of the capacitor C terminates transformer neutral point A, the leading-out terminal ground connection of capacitor C, the zinc oxide nonlinear electricity
Resistance MOV is connected in parallel on the both ends of capacitor C, and the end of incoming cables of the current-limiting reactor L is connected with the end of incoming cables of capacitor C, current limliting electricity
The leading-out terminal of anti-device L is connected with the end of incoming cables of main high-speed switch K0, the leading-out terminal of main high-speed switch K0 and the leading-out terminal of capacitor C
It is connected, the auxiliary high-speed switch K1 is connected in parallel on the both ends of main high-speed switch K0.
2. transformer neutral point direct current decoupling device according to claim 1, it is characterised in that: the main high-speed switch K0
Using vacuum extinction breaker, it is controlled by the controller being mounted in transformer neutral point direct current decoupling device and is cut-off.
3. transformer neutral point direct current decoupling device according to claim 1, it is characterised in that: the auxiliary high-speed switch K1
Using vacuum extinction breaker, for quickly exiting capacitor in main high-speed switch K0 failure or system power supply failure
C。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821003035.0U CN208433749U (en) | 2018-06-27 | 2018-06-27 | A kind of transformer neutral point direct current decoupling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821003035.0U CN208433749U (en) | 2018-06-27 | 2018-06-27 | A kind of transformer neutral point direct current decoupling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208433749U true CN208433749U (en) | 2019-01-25 |
Family
ID=65098436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821003035.0U Active CN208433749U (en) | 2018-06-27 | 2018-06-27 | A kind of transformer neutral point direct current decoupling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208433749U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599127A (en) * | 2018-06-27 | 2018-09-28 | 安徽徽电科技股份有限公司 | A kind of transformer neutral point direct current decoupling device |
-
2018
- 2018-06-27 CN CN201821003035.0U patent/CN208433749U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599127A (en) * | 2018-06-27 | 2018-09-28 | 安徽徽电科技股份有限公司 | A kind of transformer neutral point direct current decoupling device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190415 Address after: Room 2247, Block B, 9 Qianqian Road, Changping District Science Park, Beijing 102200 Patentee after: Beijing Zhonglian Technology Co., Ltd. Address before: 230088 No. 26 Hehuan Road, Hefei High-tech Zone, Anhui Province Patentee before: Anhui Huidian Technology Co., Ltd. |
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| TR01 | Transfer of patent right |