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Circuit breaker transient recovery voltage inhibition system and method of 1000kV alternative-current filter group

A technology of transient recovery voltage and AC filter, which is applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc. used to limit overcurrent/overvoltage, which can solve the problem of high transient recovery voltage and achieve recovery voltage reduction , reduce the requirements of manufacturing parameters, and reduce the effect of breaking capacity

Inactive Publication Date: 2015-04-01
STATE GRID CORP OF CHINA +1
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Problems solved by technology

The filter circuit breaker that the equipment supplier can supply can cut off the capacitive current of 1.5kA (RMS), so the capacitive current of the two-station circuit breaker cutting the AC filter bank under the power frequency overvoltage exceeds this index
Due to the existence of the residual voltage of the filter capacitor, which is at least twice the bus voltage, the transient recovery voltage is very high

Method used

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  • Circuit breaker transient recovery voltage inhibition system and method of 1000kV alternative-current filter group

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Embodiment Construction

[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0017] like figure 1 , the present invention provides a 1000kV AC filter bank circuit breaker transient recovery voltage suppression system, the system includes an AC filter bank, a circuit breaker CB, an auxiliary switch CBR, a damping resistor R and an AC bus; the AC filter bank One end is connected to the AC bus through a circuit breaker CB, and the other end is grounded; the auxiliary switch CBR and the damping resistor R are connected in parallel at both ends of the circuit breaker CB after being connected in series.

[0018] The AC filter bank includes n AC filters and n circuit breakers; the n AC filters are respectively AC filter FILT1, AC filter FILT2, ..., AC filter FILTn, and the n circuit breakers are circuit breakers respectively. circuit breaker CB1, circuit breaker CB2, ..., circuit breaker CBn.

[0019] One end of the AC filter FILT1 is grou...

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Abstract

The invention provides a circuit breaker transient recovery voltage inhibition system and a circuit breaker transient recovery voltage inhibition method of a 1000kV alternative-current filter group. The circuit breaker transient recovery voltage inhibition system comprises an alternative-current filter group, a circuit breaker CB, an auxiliary switch CBR, a damping resistor R and an alternative-current bus, wherein one end of the alternative-current filter group is connected with the alternative-current bus through the circuit breaker CB; the other end of the alternative-current filter group is grounded; the auxiliary switch CBR and the damping resistor R are connected in parallel with two ends of the circuit breaker CB after being connected in series. By adopting the circuit breaker transient recovery voltage inhibition system and the circuit breaker transient recovery voltage inhibition method of the1000kV alternative-current filter group, the probability that the gate of the circuit breaker is successfully dissociated is increased, the requirements on the manufacturing parameters of the circuit breaker are rlowered, the capability of the circuit breaker in breaking capacity current is effectively improved, and the transient recovery voltage is reduced.

Description

technical field [0001] The invention belongs to the technical field of overvoltage protection for power transmission systems, and in particular relates to a 1000kV AC filter bank circuit breaker transient recovery voltage suppression system and method. Background technique [0002] The recovery voltage is the voltage that appears between one pole and two terminals of the switch after the switch breaks the current and extinguishes the arc. The voltage can be considered as two consecutive sections, initially the transient recovery voltage, followed by the power frequency recovery voltage. The rated short-circuit breaking current and the peak transient recovery voltage associated with the rated short-circuit breaking current are the rated parameters of the circuit breaker. [0003] Engineering practice and simulation calculations show that when the circuit breaker of the 1000kV AC filter bank is opened, the capacitive current that needs to be broken is relatively large. The s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04
Inventor 何慧雯戴敏周沛洪王磊万磊娄颖范冕李振强严飞
Owner STATE GRID CORP OF CHINA
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