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Overvoltage protection circuit for substation and application thereof

A technology for protection circuits and substations, which is applied to emergency protection circuit devices, emergency protection circuit devices, circuit devices and other directions for limiting overcurrent/overvoltage. the effect of shock

Pending Publication Date: 2019-03-19
国网湖北省电力有限公司黄石供电公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of damage to electrical equipment such as generators, power transformers, and high-voltage motors caused by various overvoltages generated in the current power system, and to provide an overvoltage protection circuit for substations and its application

Method used

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  • Overvoltage protection circuit for substation and application thereof
  • Overvoltage protection circuit for substation and application thereof
  • Overvoltage protection circuit for substation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] see figure 1 , an overvoltage protection circuit for a substation, including a three-phase incoming line circuit 1, a three-phase outgoing line side circuit 2 and a star connection circuit 3 with its own neutral point; the three-phase incoming line side circuit 1 is composed of A1 and B1 respectively , C1 three-phase incoming line terminal, three-phase linkage isolating switch S1 and three-phase damping resistor R1 are sequentially connected in series; the three-phase outgoing line side circuit 2 is respectively composed of A2, B2, C2 three-phase outgoing line terminal and three-phase linkage isolating switch S2 and The three-phase damping resistor R2 is connected in series in sequence; the non-connected end of the three-phase damping resistor R1 and the three-phase linkage isolating switch S1 is connected to the three-phase damping resistor R2 and the three-phase through the wire a, wire b, and wire c in the same phase sequence. The non-connecting end of the linkage is...

Embodiment 2

[0020] see figure 2 , this embodiment is based on embodiment 1, the overvoltage protection circuit described in this embodiment is used for substation bus circuit breaker protection; figure 2 There are segmented busbars W1 and W2, transformers and bus circuit breakers are installed in turn on the input side of each segmented busbar, and several groups of loads are connected in parallel at the output side of each segmented busbar; A1, B1, C1 three The phase incoming line terminal and the A2, B2, C2 three-phase outgoing line terminals are correspondingly bridged between the incoming line end and the outgoing line end of the bus circuit breaker.

[0021] In the present invention, when the bus circuit breaker of the substation is opened and the system damping process ends, the three-phase linkage isolation switch S1 and the three-phase linkage isolation switch S2 are opened at the same time, so that the overvoltage protection circuit can be isolated and withdrawn from the power ...

Embodiment 3

[0023] see image 3 , this embodiment is based on Embodiment 1, the overvoltage protection circuit described in this embodiment is used for short-circuit fault protection to ground in the substation outlet interval; image 3 There are segmented busbars W1 and W2, transformers and bus circuit breakers are installed in turn on the input side of each segmented busbar, and several groups of loads are connected in parallel at the output side of each segmented busbar; A1, B1, C1 three The phase incoming line terminal and the three-phase outgoing line terminals A2, B2, and C2 are correspondingly connected between the segmented bus W1 / W2 of the substation and the ground line G2 of the outgoing line interval.

[0024] In the present invention, when there is a short-circuit fault in the outgoing line interval of the substation and the system damping process is over, the three-phase linkage isolating switch S1 and the three-phase linkage isolating switch S2 are opened at the same time, a...

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Abstract

The invention discloses an overvoltage protection circuit for a substation and an application thereof. The overvoltage protection circuit comprises a three-phase inlet-line side circuit, a three-phaseoutlet-side circuit and a star type connection circuit with a neutral point. The three-phase inlet-line side circuit is formed by successive series connection of three-phase inlet line ends A1, B1 and C1, a three-phase linked disconnecting switch S1 and a three-phase damping resistor R1. The three-phase outlet-side circuit is formed by successive series connection of three-phase outlet line endsA2, B2 and C2, a three-phase linked disconnecting switch S2 and a three-phase damping resistor R2. Wires a, b, and c are connected with three-phase input terminals of the star type connection circuit;each phase of circuit of the star type connection circuit is connected in series with a damping resistor R3; and the neutral point of the star type connection circuit is grounded through a damping resistor R3. According to the invention, the overvoltage protection circuit having a simple structure is designed ingeniously; and overvoltage protection against the ground short circuit faults betweena bus circuit breaker and an outlet line is realized.

Description

technical field [0001] The invention relates to the technical field of power system overvoltage and insulation protection, in particular to an overvoltage protection circuit for a substation and its application. Background technique [0002] At present, the rapid breaking of short-circuit fault current is one of the most important performances of circuit breakers, especially for three-phase short-circuits at the outlet side of generators and main transformers. The large-rated circuit and high short-circuit breaking capacity that the circuit breaker cannot bear often cause the stator of the generator or the winding of the main transformer to burn out. The overvoltage generated by the operation, cut-off, resonance and lightning strike of the power system is always threatening the insulation of electrical equipment and the safe operation of the power system. Among them, the single-phase intermittent arc grounding overvoltage is the most serious, often due to single-phase ground...

Claims

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Application Information

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IPC IPC(8): H02H9/04
CPCH02H9/04H02H9/045
Inventor 刘斌刘波曾国朱仲彦刘首文张海胡浩蔡杰王晓石义良刘帆汤庆生舒立奎
Owner 国网湖北省电力有限公司黄石供电公司
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