CN208890368U - An overvoltage protection circuit for a substation - Google Patents
An overvoltage protection circuit for a substation Download PDFInfo
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- CN208890368U CN208890368U CN201821997973.7U CN201821997973U CN208890368U CN 208890368 U CN208890368 U CN 208890368U CN 201821997973 U CN201821997973 U CN 201821997973U CN 208890368 U CN208890368 U CN 208890368U
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Abstract
The utility model discloses a kind of substation overvoltage protection circuits, include the star-like connection circuit of three-phase inlet wire lateral circuit, three-phase outlet lateral circuit and included neutral point；Three-phase inlet wire lateral circuit is sequentially connected in series by A1, B1, C1 three-phase end of incoming cables and three-phase linkage isolating switch S1 and three-phase damping resistance R1；Three-phase outlet lateral circuit is sequentially connected in series by A2, B2, C2 three-phase leading-out terminal and three-phase linkage isolating switch S2 and three-phase damping resistance R2；Three-phase damping resistance R1 is correspondingly connected with three-phase damping resistance R2 by conducting wire a, b, c with identical phase sequence, and conducting wire a, b, c are separately connected the three-phase input end of star-like connection circuit；Damping resistance R3 is in series on every circuitry phase of star-like connection circuit, the neutral point of star-like connection circuit is grounded by damping resistance R4；The utility model structure is simple, ingenious in design, effectively realizes the overvoltage protection to bus breaker and outgoing line interval shorted to earth failure.
Description
Technical field
The utility model relates to Hyper-Voltage of Power Systems and insulating protection technical field, especially a kind of used electricity of substation
Press protection circuit.
Background technique
It currently, is one of most important performance of breaker to the quick-speed turning on-off of short-circuit current, especially with generator, main transformer
The three-phase shortcircuit of depressor outlet side is very.The big amount circuit and high short circuit breaking capacity that breaker cannot withstand often result in hair
Motor stator or main transformer winding.The operation of electric system, shut off, the overvoltage moment of the generations such as resonance and lightning stroke is all in prestige
The safe operation of insulation and the electric system of electrical equipment is coerced, wherein especially the tightest with single-phase intermittent arc earthing overvoltage
Weight often because singlephase earth fault becomes multiphase ground fault in turn, and causes electric power because processing causes fault spread not in time
The large-area power-cuts of system.At the same time, there is distributed inductances, capacitor these energy storage devices in the power system, in circuit
It changes and passes by transient, due to the conversion of energy between source side or the energy storage device of load-side, it will the oscillation of energy is induced, this
And the main reason for causing a variety of overvoltage of phase-phase, phase-ground to generate.
Thus, effectively inhibit various overvoltage, facilitates to weak isolatings such as generator, power transformer, high-tension motors
The safety of equipment plays positive protective effect.
Summary of the invention
A variety of overvoltage that the purpose of this utility model seeks to solve to generate in current electric system cause to generate electricity mechanical, electrical
The problem of electrical equipments such as power transformer, high-tension motor are damaged provides a kind of substation's overvoltage protection electricity thus
Road.
The concrete scheme of the utility model is: a kind of substation's overvoltage protection circuit, includes three-phase enter line side electricity
The star-like connection circuit on road, three-phase outlet lateral circuit and included neutral point；Three-phase inlet wire lateral circuit is respectively by A1, B1, C1 three-phase
End of incoming cables and three-phase linkage isolating switch S1 and three-phase damping resistance R1 are sequentially connected in series；Three-phase outlet lateral circuit respectively by
A2, B2, C2 three-phase leading-out terminal and three-phase linkage isolating switch S2 and three-phase damping resistance R2 are sequentially connected in series；Three-phase damping
The front of motor of resistance R1 and three-phase linkage isolating switch S1 is correspondingly connected with three-phase damping by conducting wire a, b, c with identical phase sequence
The front of motor of resistance R2 and three-phase linkage isolating switch S2, and conducting wire a, b, c are separately connected the three-phase of star-like connection circuit
Input terminal；Damping resistance R3 is in series on every circuitry phase of star-like connection circuit, the neutral point of star-like connection circuit passes through
Damping resistance R4 ground connection；Three-phase linkage isolating switch S1 and three-phase linkage isolating switch S2 takes chain with reality on operation logic
Now opening/closing movement simultaneously.
Damping resistance R1 described in the utility model, damping resistance R2, damping resistance R3 and damping resistance R4 are all made of super
The high-power nonlinear damping resistor of large capacity, resistance to compression grade is in 1.5.p.u or more.
The utility model provides a kind of first kind application of substation's overvoltage protection circuit, institute in the utility model
It states overvoltage protection circuit to protect for substation bus bar breaker, wherein A1, B1, C1 three-phase end of incoming cables and A2, B2, C2 three-phase
Leading-out terminal correspondence is connected across between the end of incoming cables and leading-out terminal of bus breaker.
In the utility model, after substation bus bar breaker open operation and system damping process, by three-phase ganged every
It leaves pass S1 and three-phase linkage isolating switch S2 to open simultaneously, overvoltage protection circuit can be isolated and exit electric system；When
When system operates normally, and after bus breaker closing, by three-phase linkage isolating switch S1 and three-phase linkage isolating switch S2
Close simultaneously, overvoltage protection circuit is started to work operation, with inhibit the switching overvoltage generated during Operation of Electric Systems,
Cut-off overvoltage, resonance overvoltage and single-phase intermittent arc earthing overvoltage etc., so that bus breaker is implemented to protect,
And ensure the safe operation of the electrical equipments such as generator, power transformer, high-tension motor；When overvoltage protection circuit is implemented
When maintenance, three-phase linkage isolating switch S1 and three-phase linkage isolating switch S2 are opened simultaneously, it can be by overvoltage protection circuit
Electric system is exited in isolation.
The utility model provides a kind of the second class application of substation's overvoltage protection circuit, described in the utility model
Overvoltage protection circuit is used for substation's outgoing line interval shorted to earth error protection, wherein A1, B1, C1 three-phase end of incoming cables and A2,
B2, C2 three-phase leading-out terminal correspondence are connected across between the bus of substation and outgoing line interval ground wire.
In the utility model, after substation's outgoing line interval short trouble and system damping process, by three-phase ganged
Disconnecting switch S1 and three-phase linkage isolating switch S2 are opened simultaneously, and overvoltage protection circuit can be isolated and be exited electric system,
To implement to overhaul to faulty circuit；When systems are functioning properly, by three-phase linkage isolating switch S1 and three-phase linkage isolating switch
S2 closes simultaneously, and overvoltage protection circuit is started to work operation, is lured with inhibiting the conversion of energy between electric system energy storage device
The energy oscillation of hair, and further issuable phase-phase, a variety of overvoltage in phase-ground are inhibited；When overvoltage protection electricity
When maintenance is implemented on road, three-phase linkage isolating switch S1 and three-phase linkage isolating switch S2 are opened simultaneously, overvoltage can be prevented
Electric system is exited in protection circuit isolation.
Compared with prior art, the overvoltage protection circuit that the utility model is designed based on each damping resistance realizes
Energy in each energy storage device is absorbed in real time to the overvoltage protection of bus breaker, and in circuit switching, from source
The concussion of energy is inhibited, phase-phase, the various overvoltage effective dampings in phase-ground can be inhibited in extremely low level, it can be to power generation
The weak isolatings equipment such as mechanical, electrical power transformer, high-tension motor are entirely capable of playing positive protective effect；At the same time, this is practical
Electrical safety after novel special structure design realization facility exits is isolated, so as to overhaul of the equipments.
Detailed description of the invention
Fig. 1 is the electrical schematic diagram of the utility model；
Fig. 2 is the electrical connection schematic diagram that the utility model implements protection to substation bus bar breaker；
Fig. 3 is the electrical connection schematic diagram that the utility model implements protection to substation's outgoing line interval shorted to earth failure.
In figure: 1-three-phase inlet wire lateral circuit, 2-three-phase outlet lateral circuits, 3-star-like connection circuits.
Specific embodiment
Embodiment 1
Referring to Fig. 1, a kind of substation's overvoltage protection circuit includes three-phase inlet wire lateral circuit 1, three-phase outgoing line side electricity
The star-like connection circuit 3 on road 2 and included neutral point；Three-phase inlet wire lateral circuit 1 is respectively by A1, B1, C1 three-phase end of incoming cables and three-phase
Linkage disconnector S1 and three-phase damping resistance R1 are sequentially connected in series；Three-phase outlet lateral circuit 2 is respectively by A2, B2, C2 tri-
Phase leading-out terminal and three-phase linkage isolating switch S2 and three-phase damping resistance R2 are sequentially connected in series；Three-phase damping resistance R1 and three
The front of motor of the disconnecting switch that is connected S1 is correspondingly connected with three-phase damping electricity by conducting wire a, conducting wire b, conducting wire c with identical phase sequence
Hinder R2 and three-phase linkage isolating switch S2 front of motor, and conducting wire a, b, c be separately connected star-like connection circuit three-phase it is defeated
Enter end；Damping resistance R3 is in series on every circuitry phase of star-like connection circuit, the neutral point O of star-like connection circuit passes through resistance
Buffer resistance R4 is grounded G1；Three-phase linkage isolating switch S1 and three-phase linkage isolating switch S2 takes chain with reality on operation logic
Now opening/closing movement simultaneously.
Damping resistance R1 described in the present embodiment, damping resistance R2, damping resistance R3 and damping resistance R4 are all made of super large
The high-power nonlinear damping resistor of capacity, resistance to compression grade is in 1.5.p.u or more, i.e., when the busbar voltage of system is 10kV,
The resistance to compression grade of each damping resistance is in 15kV or more；When the busbar voltage of system is 30kV, the resistance to compression of each damping resistance
Grade is in 45kV or more.
Embodiment 2
Referring to fig. 2, the present embodiment is based on embodiment 1, and overvoltage protection circuit described in the present embodiment is female for substation
The protection of line breaker；In Fig. 2 be equipped with sectionalized busbar W1, W2, the input side of every sectionalized busbar be sequentially arranged with transformer and
Bus breaker, every sectionalized busbar outlet side and be connected to several groups load；A1, B1, C1 three-phase end of incoming cables and A2, B2,
C2 three-phase leading-out terminal correspondence is connected across between the end of incoming cables and leading-out terminal of bus breaker.
In the utility model, after substation bus bar breaker open operation and system damping process, by three-phase ganged every
It leaves pass S1 and three-phase linkage isolating switch S2 to open simultaneously, overvoltage protection circuit can be isolated and exit electric system；When
When system operates normally, and after bus breaker closing, by three-phase linkage isolating switch S1 and three-phase linkage isolating switch S2
Close simultaneously, overvoltage protection circuit is started to work operation, with inhibit the switching overvoltage generated during Operation of Electric Systems,
Cut-off overvoltage, resonance overvoltage and single-phase intermittent arc earthing overvoltage etc., so that bus breaker is implemented to protect,
And ensure the safe operation of the electrical equipments such as generator, power transformer, high-tension motor；When overvoltage protection circuit is implemented
When maintenance, three-phase linkage isolating switch S1 and three-phase linkage isolating switch S2 are opened simultaneously, it can be by overvoltage protection circuit
Electric system is exited in isolation.
Embodiment 3
Referring to Fig. 3, the present embodiment is based on embodiment 1, and overvoltage protection circuit described in the present embodiment goes out for substation
Line interval shorted to earth error protection；It is equipped with sectionalized busbar W1, W2 in Fig. 3, is successively filled in the input side of every sectionalized busbar
Have transformer and bus breaker, every sectionalized busbar outlet side and be connected to several groups load；A1, B1, C1 three-phase inlet wire
It holds between the sectionalized busbar W1/W2 for being connected across substation and outgoing line interval ground wire G2 corresponding with A2, B2, C2 three-phase leading-out terminal.
In the utility model, after substation's outgoing line interval short trouble and system damping process, by three-phase ganged
Disconnecting switch S1 and three-phase linkage isolating switch S2 are opened simultaneously, and overvoltage protection circuit can be isolated and be exited electric system,
To implement to overhaul to faulty circuit；When systems are functioning properly, by three-phase linkage isolating switch S1 and three-phase linkage isolating switch
S2 closes simultaneously, and overvoltage protection circuit is started to work operation, is lured with inhibiting the conversion of energy between electric system energy storage device
The energy oscillation of hair, and further issuable phase-phase, a variety of overvoltage in phase-ground are inhibited；When overvoltage protection electricity
When maintenance is implemented on road, three-phase linkage isolating switch S1 and three-phase linkage isolating switch S2 are opened simultaneously, overvoltage can be prevented
Electric system is exited in protection circuit isolation.
The above, is only some embodiments of the utility model, and the utility model is not only restricted to the limit of above-described embodiment
System, all foundation the technical essence of the utility model are to similar modification, variation made by above-described embodiment and replace, and still fall within this reality
In the range of new technique scheme.The protection scope of the utility model is only defined by tbe claims.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821997973.7U CN208890368U (en) | 2018-11-30 | 2018-11-30 | An overvoltage protection circuit for a substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821997973.7U CN208890368U (en) | 2018-11-30 | 2018-11-30 | An overvoltage protection circuit for a substation |
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| Publication Number | Publication Date |
|---|---|
| CN208890368U true CN208890368U (en) | 2019-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821997973.7U Active CN208890368U (en) | 2018-11-30 | 2018-11-30 | An overvoltage protection circuit for a substation |
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| CN (1) | CN208890368U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494701A (en) * | 2018-11-30 | 2019-03-19 | 国网湖北省电力有限公司黄石供电公司 | A kind of substation overvoltage protection circuit and its application |
-
2018
- 2018-11-30 CN CN201821997973.7U patent/CN208890368U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494701A (en) * | 2018-11-30 | 2019-03-19 | 国网湖北省电力有限公司黄石供电公司 | A kind of substation overvoltage protection circuit and its application |
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Effective date of registration: 20200828 Address after: No. 155 Huangshi Avenue, Huangshi, Hubei Province, Hubei Co-patentee after: SHANGHAI SUIN ELECTRIC Co.,Ltd. Patentee after: HUANGSHI POWER SUPPLY COMPANY OF STATE GRID HUBEI ELECTRIC POWER Co.,Ltd. Address before: No. 155 Huangshi Avenue, Huangshi, Hubei Province, Hubei Co-patentee before: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Patentee before: HUANGSHI POWER SUPPLY COMPANY OF STATE GRID HUBEI ELECTRIC POWER Co.,Ltd. Co-patentee before: SHANGHAI SUIN ELECTRIC Co.,Ltd. |