CN209046243U - A kind of voltage transformer protection device of technological service - Google Patents
A kind of voltage transformer protection device of technological service Download PDFInfo
- Publication number
- CN209046243U CN209046243U CN201821771383.2U CN201821771383U CN209046243U CN 209046243 U CN209046243 U CN 209046243U CN 201821771383 U CN201821771383 U CN 201821771383U CN 209046243 U CN209046243 U CN 209046243U
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- voltage transformer
- fuse
- intelligent switch
- technological service
- protection device
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Abstract
The utility model discloses a kind of voltage transformer protection devices of technological service, it is used cooperatively using intelligent switch and a resonance eliminator, intelligent switch is closed when systems are functioning properly, while one time resonance eliminator is short-circuited, voltage transformer neutral-point solid ground, when system is by abnormal conditions such as arc groundings, intelligent switch is opened, one time resonance eliminator accesses neutral point, after fundamentally solving system single-phase earth fault elimination, when three-phase voltage restores balance, system is shoved the problem of causing PT fuse failure or PT to damage by neutral point of PT over the ground, it can effectively solve the problem that PT burnout problems, to reinforcement Operation of Electric Systems maintenance management, ensure power grid security, stable and reliability service has positive effect.
Description
Technical field
The utility model relates to a kind of voltage transformer protection devices of technological service, belong to voltage transformer protection skill
Art field.
Background technique
Power supply-distribution system is pressed mainly to use neutral non-effective grounding mode in 3~35kV of China, power supply reliability is wanted
Much higher than the power supply-distribution system of neutral point effective grounding.From the operating experience and the development of middle pressure power supply-distribution system in recent years of many years
Situation sees that neutral non-effective grounding mode also gives middle pressure power supply-distribution system to bring some problems: neutral non-effective grounding
When singlephase earth fault occurring in system, it is usually expressed as the form of arc grounding, non-faulting phase line voltage-to-ground is most at this time
Height can rise to 3.5 times of phase voltages, and the overvoltage of system often causes insulation flashover over the ground in system insulation weakness.
Electromagnetic potential transformer (Potential transformer, abbreviation PT) has nonlinear electromagnetic property.?
System restores by Lightning Over-voltage, switching overvoltage, ground fault and the extraneous factors such as PT itself breakers asynchronous closing are interfered
Under, PT iron core is saturated, and inductance sharply declines, and is easy and system parameter excites complicated ferromagnetic resonance, generate high frequency, work
Frequently, low-frequency resonant overvoltage.The low of PT is flowed through when PT core sataration generates larger excitation surge current and ground fault recovery simultaneously
Frequency oscillating current may cause PT fuse failure, and PT is even resulted in when serious and is burnt.
Utility model content
The utility model overcomes the shortcomings of the prior art, and the voltage transformer for providing a kind of technological service is protected
Protection unit effectively can avoid voltage transformer from burning.
In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model are as follows: a kind of technological service voltage is mutual
Sensor protective device, comprising: voltage transformer, a resonance eliminator, intelligent switch, fuse and surge absorber；Wherein, electric
Pressing mutual inductor includes three windings, and first winding and secondary winding have 2 neutral points, access one in parallel between 2 neutral points
Secondary resonance eliminator and intelligent switch, 2 neutral point one of them ground connection, fuse connect the first winding of voltage transformer and excessively electric
Absorber is pressed, surge absorber one end connects fuse, other end ground connection.
Wherein, voltage transformer is all insulation voltage transformer of 2 times or more saturation point, three windings are respectively star-like,
Star-like, open delta type wiring.
Wherein, surge absorber is no six column of neutral point without cascaded structure, is connected with fuse using copper bar.
Wherein, fuse is high score fuse.
The utility model is had the beneficial effect that compared with prior art when system is by abnormal conditions such as arc groundings
When, intelligent switch is opened, and resonance eliminator accesses neutral point, after fundamentally solving system single-phase earth fault elimination, three
When phase voltage restores balance, system is shoved the problem of causing PT fuse failure or PT to damage by neutral point of PT over the ground, energy
It is enough effectively to solve PT burnout problems, to Operation of Electric Systems maintenance management is reinforced, ensure power grid security, stabilization and reliability service tool
There is positive effect.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the voltage transformer protection device of technological service provided by the utility model.
1 be voltage transformer, 2 be a resonance eliminator, 3 be intelligent switch, 4 be high-tension fuse, 5 be overvoltage absorb
Device.
Specific embodiment
The utility model is described further with reference to the accompanying drawing.
As shown in Figure 1, a kind of voltage transformer protection device of technological service of the utility model, including voltage transformer
1, the voltage transformer selects high quality, and all insulation voltage transformer of 2 times or more saturation point, three windings are respectively star
Type, star-like, open delta type wiring, there are two neutral points for first and second winding.It connects between described two neutral points and once disappears
Humorous device 2, intelligent switch 3, a resonance eliminator 2 are connected in parallel with intelligent switch 3, a resonance eliminator 2, intelligent switch 3, mutual induction of voltage
It is grounded after the connection of 2 secondary winding neutral point of device.Resonance eliminator 2 uses insulation values for the Thyrite of 130M Ω electricity
Resistance, and be in parallel with intelligent switch 2.The intelligent switch 2, the closure of intelligent switch 2 harmonic elimination of bypass when system operates normally
Device is equivalent to the neutral ground of PT, completely inhibits the variation of the measurement opening of system, does not influence measurement and the guarantor of system
Shield；When ferromagnetic resonance occurs for voltage transformer, neutral point generates displacement, makes three-phase voltage asymmetry, produces at open delta both ends
Raw residual voltage, mutual inductor high-voltage winding flow through zero-sequence current；The disconnection of intelligent switch 2 puts into a resonance eliminator 1, effectively inhibits
The resonance of system, ground fault restore after timing closing effectively inhibit system shove and low-frequency resonant.The overvoltage absorbs
Device 5, using no six column of neutral point without cascaded structure, 2ms square wave through-current capacity reaches 3200A, and when switching aircraft carrier line, bus is in nothing
In overvoltage protection state.Surge absorber 5 is connected with fuse 4 using copper bar, and the fuse 4 is high breaking fusing
Device, the fuse other end are connect with 1 primary side of voltage transformer.
The utility model is had the beneficial effect that compared with prior art when system is by abnormal conditions such as arc groundings
When, intelligent switch is opened, and resonance eliminator accesses neutral point, after fundamentally solving system single-phase earth fault elimination, three
When phase voltage restores balance, system is shoved the problem of causing PT fuse failure or PT to damage by neutral point of PT over the ground, energy
It is enough effectively to solve PT burnout problems, to Operation of Electric Systems maintenance management is reinforced, ensure power grid security, stabilization and reliability service tool
There is positive effect.
Although the utility model has been described by way of example and in terms of the preferred embodiments, but it is not to appoint for limiting the utility model
What those skilled in the art without departing from the spirit and scope of the utility model, may be by the method and skill of the disclosure above
Art content makes possible variation and modification to technical solutions of the utility model, therefore, all without departing from the utility model technology
The content of scheme, it is made by the above technical examples according to the technical essence of the present invention it is any it is simple modification, equivalent variations and
Modification, belongs to the protection scope of technical solutions of the utility model.
Claims (4)
1. a kind of voltage transformer protection device of technological service characterized by comprising voltage transformer, a harmonic elimination
Device, intelligent switch, fuse and surge absorber；Wherein, voltage transformer include three windings, first winding and it is secondary around
Group has 2 neutral points, and resonance eliminator of access in parallel and intelligent switch, 2 neutral point one of them connect between 2 neutral points
Ground, fuse connect the first winding and surge absorber of voltage transformer, and surge absorber one end connects fuse, separately
One end ground connection.
2. the voltage transformer protection device of technological service according to claim 1, which is characterized in that the voltage is mutual
Sensor is all insulation voltage transformer of 2 times or more saturation point, and three windings are respectively star-like, star-like, open delta type wiring.
3. the voltage transformer protection device of technological service according to claim 1, which is characterized in that the overvoltage
Absorber is no six column of neutral point without cascaded structure, is connected with fuse using copper bar.
4. the voltage transformer protection device of technological service according to claim 1, which is characterized in that the fuse
For high score fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821771383.2U CN209046243U (en) | 2018-10-30 | 2018-10-30 | A kind of voltage transformer protection device of technological service |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821771383.2U CN209046243U (en) | 2018-10-30 | 2018-10-30 | A kind of voltage transformer protection device of technological service |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209046243U true CN209046243U (en) | 2019-06-28 |
Family
ID=67040156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821771383.2U Active CN209046243U (en) | 2018-10-30 | 2018-10-30 | A kind of voltage transformer protection device of technological service |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209046243U (en) |
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2018
- 2018-10-30 CN CN201821771383.2U patent/CN209046243U/en active Active
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