CN207530534U - The voltage transformer overvoltage protection inhibited using current transformer sample resistance - Google Patents
The voltage transformer overvoltage protection inhibited using current transformer sample resistance Download PDFInfo
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- CN207530534U CN207530534U CN201721689258.2U CN201721689258U CN207530534U CN 207530534 U CN207530534 U CN 207530534U CN 201721689258 U CN201721689258 U CN 201721689258U CN 207530534 U CN207530534 U CN 207530534U
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Abstract
The utility model discloses a kind of voltage transformer overvoltage protections inhibited using current transformer sample resistance.It includes the voltage transformer (1) being connected across between busbar and ground wire, and the impedance that current-limiting resistor (2) and normally closed switch (3) by being connected in parallel form particularly is connected in series between the primary side and ground wire of voltage transformer (1) and inhibits component；The overvoltage sampling assemble being made of the ZnO resistors device (7) by being connected in series with and current transformer (6) is also bridged between busbar and ground wire；The both ends of current transformer (6) are electrically connected through delayer (5), driver (4) with the control terminal of normally closed switch (3).It rational in infrastructure, practical, can completely effectively avoid steep wave disturb caused by system zero sequence vibrate harm to voltage transformer, can be widely used in the protection to voltage transformer in the power supply-distribution system that 6 35kV neutral points are not directly grounded.
Description
Technical field
The utility model is related to a kind of overvoltage protections, especially a kind of to be inhibited using current transformer sample resistance
Voltage transformer overvoltage protection.
Background technology
In the power supply-distribution system not being directly grounded in the 6-35kV neutral points in China, voltage transformer be people must prison
The equipment for surveying voltage.At present, the impact for various overvoltage in anti-locking system, people often concatenate in the primary side of voltage transformer
Fuse, such as entitled " the reason of Fusing of Multiphase Fuse of 10-35 kV TV at Lightning Stroke is analyzed ",《Power equipment》2004 3
Month the 3rd the 45-48 pages of the article of phase of volume 5.This article discusses isolated neutral system by taking 110kV Yu Xi substations as an example
The a variety of causes and processing method that middle voltage transformer primary side fuse fuses in lightning stroke；However, its fail to solve due to
The system zero sequence that lightning stroke or switching overvoltage generate vibrates the harm caused by voltage transformer --- and the energy of zero sequence oscillation is only
It can be discharged by the voltage transformer in system, the energy of release can cause mutual with voltage according to the randomness vibrated when serious
The fuse failure of sensor concatenation, will lead to burning for voltage transformer, and make the protection misoperation of system when even more serious, so as to
The generation of initiation system large area blackout.
Utility model content
The technical problems to be solved in the utility model provides a kind of structure and closes to overcome shortcoming of the prior art
Reason, the practical voltage transformer overvoltage protection inhibited using current transformer sample resistance.
The technical issues of to solve the utility model, used technical solution is, using current transformer sample resistance
The voltage transformer overvoltage protection of inhibition includes the voltage transformer being connected across between busbar and ground wire, particularly：
Impedance is connected in series between the primary side and ground wire of the voltage transformer and inhibits component, the impedance inhibits component
It is made of the current-limiting resistor and normally closed switch that are connected in parallel；
Between the busbar and ground wire also bridging has an overvoltage sampling assemble, and the overvoltage sampling assemble is by being connected in series with
ZnO resistors device and current transformer composition；
The both ends of the current transformer are electrically connected through delayer, driver with the control terminal of normally closed switch.
It is taken as being further improved for the voltage transformer overvoltage protection of current transformer sample resistance inhibition：
Preferably, the resistance value of current-limiting resistor is 5-10k Ω.
Preferably, normally closed switch is mechanical normally closed switch or electronic type normally closed switch.
Preferably, current transformer is electromagnetic current transducer or current divider or electronic current mutual inductor or light
Fiber current sensor, induction reactance are 5-15m Ω.
Preferably, delayer is delay circuit or the time relay, delay time 50-150ms.
It is relative to the advantageous effect of the prior art：
After such structure, if occur lightning stroke or switching overvoltage, overvoltage sampling assemble will output signal,
Normally closed switch to be controlled to disconnect by delayer and driver, the zero sequence oscillation energy in system is made to inhibit component via impedance
In current-limiting resistor gently discharge, so as to be effectively protected the voltage transformer in system, it is ensured that system safety fortune
Row.The present apparatus is rational in infrastructure, practical, and the oscillation of system zero sequence is to mutual induction of voltage caused by can completely effectively avoiding steep wave disturbance
The harm of device can be widely used in the power supply-distribution system that 6-35kV neutral points are not directly grounded to the guarantor of voltage transformer
Shield.
Description of the drawings
Fig. 1 is a kind of basic circuit structure schematic 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 voltage transformer overvoltage protection inhibited using current transformer sample resistance is such as
Under：
Busbar is connected to the voltage transformer 1 being connected in series with ground wire span and impedance inhibits component；Wherein, impedance inhibition group
Part is made of the current-limiting resistor 2 and normally closed switch 3 being connected in parallel, and the resistance value of current-limiting resistor 2 therein is 8 (can be 5-10)
K Ω, normally closed switch 3 are mechanical normally closed switch (or electronic type normally closed switch).
Also bridging has overvoltage sampling assemble between busbar and ground wire；Wherein, overvoltage sampling assemble is by the oxygen that is connected in series with
Change zinc resistor 7 and current transformer 6 form, current transformer 6 therein for electromagnetic current transducer (or current divider or
Electronic current mutual inductor or fibre optic current sensor), induction reactance is 10 (can be 5-15) m Ω.
The both ends of current transformer 6 are electrically connected through delayer 5, driver 4 with the control terminal of normally closed switch 3；Wherein, it is delayed
Device 5 is delay circuit (or time relay), and delay time is 100 (can be 50-150) ms.
In use, it only needs first to select each component applied to the voltage class in electric system according to the utility model
Electric parameter, then by three input contacts of the voltage transformer 1 in the utility model and ZnO resistors device 7 respectively with electric power
A phases, B phases and the C of system are electrically connected, ground wire is electrically connected with the earth.
When lightning stroke or switching overvoltage occurs, since the volt-ampere of the ZnO resistors device 7 in overvoltage sampling assemble is special
Property, ZnO resistors device 7 is breakdown, wherein the high current flowed through is when by way of current transformer 6, in the two of current transformer 6
End generates the sampling voltage signal that ZnO resistors device 7 punctures the moment.The sampling voltage signal keeps its voltage by delayer 5
The level 100ms of signal.The electric signal of holding by driver 4 control normally closed switch 3 disconnect, the energy in power supply-distribution system by
Impedance inhibits the current-limiting resistor 2 of component to absorb, and makes power supply-distribution system due to the zero sequence oscillation energy for being struck by lightning or operating and cause
Slow release；So as to protect the voltage transformer 1 of system, it is ensured that the safe operation of system.
Obviously, those skilled in the art can be to the electricity inhibited using current transformer sample resistance of the utility model
Mutual inductor overvoltage protection is pressed to carry out spirit and scope of the various modification and variations without departing from the utility model.In this way,
If being belonged to the scope of the claims of the present invention and its equivalent technology to these modifications and variations of the present invention,
Then the utility model is also intended to include these modifications and variations.
Claims (5)
1. a kind of voltage transformer overvoltage protection inhibited using current transformer sample resistance, including being connected across busbar
Voltage transformer (1) between ground wire, it is characterised in that：
Impedance is connected in series between the primary side and ground wire of the voltage transformer (1) and inhibits component, the impedance inhibits component
It is made of the current-limiting resistor (2) and normally closed switch (3) that are connected in parallel；
Also bridging has an overvoltage sampling assemble between the busbar and ground wire, and the overvoltage sampling assemble is by the oxidation that is connected in series with
Zinc resistor (7) and current transformer (6) composition；
The both ends of the current transformer (6) are electrically connected through delayer (5), driver (4) with the control terminal of normally closed switch (3).
2. the voltage transformer overvoltage protection according to claim 1 inhibited using current transformer sample resistance is filled
It puts, it is characterized in that the resistance value of current-limiting resistor (2) is 5-10k Ω.
3. the voltage transformer overvoltage protection according to claim 1 inhibited using current transformer sample resistance is filled
It puts, it is characterized in that normally closed switch (3) is mechanical normally closed switch or electronic type normally closed switch.
4. the voltage transformer overvoltage protection according to claim 1 inhibited using current transformer sample resistance is filled
It puts, it is characterized in that current transformer (6) is electromagnetic current transducer or current divider or electronic current mutual inductor or optical fiber
Current sensor, induction reactance are 5-15m Ω.
5. the voltage transformer overvoltage protection according to claim 1 inhibited using current transformer sample resistance is filled
It puts, it is characterized in that delayer (5) is delay circuit or the time relay, delay time 50-150ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721689258.2U CN207530534U (en) | 2017-12-06 | 2017-12-06 | The voltage transformer overvoltage protection inhibited using current transformer sample resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721689258.2U CN207530534U (en) | 2017-12-06 | 2017-12-06 | The voltage transformer overvoltage protection inhibited using current transformer sample resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207530534U true CN207530534U (en) | 2018-06-22 |
Family
ID=62578160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721689258.2U Active CN207530534U (en) | 2017-12-06 | 2017-12-06 | The voltage transformer overvoltage protection inhibited using current transformer sample resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207530534U (en) |
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2017
- 2017-12-06 CN CN201721689258.2U patent/CN207530534U/en active Active
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