Storage battery pack short-circuit intertripping protection device and protection method thereof

Abstract

The invention relates to a storage battery pack short-circuit intertripping protection device which is applied to storage battery pack operation protection in a transformer substation direct-current system and belongs to the field of power system operation field operation inspection. The device comprises a storage battery pack protection device, a first direct-current circuit breaker connected tothe middle of a storage battery pack in series, and a second direct-current circuit breaker mounted at positive and negative outlets of the storage battery pack, the storage battery pack protection device comprises an optical coupler isolation input circuit used for collecting K1 position information of the first direct-current breaker and a low-pass filter used for collecting storage battery packvoltage, storage battery pack current and direct-current bus voltage, and the optical coupler isolation input circuit and the low-pass filter are both in communication connection with an industrial personal computer. The output end of the industrial personal computer is connected with a solid-state relay output circuit, and the solid-state relay output circuit is in control connection with the second direct-current circuit breaker. The device is simple in principle, stable, reliable, easy and convenient to install, sensitive, rapid, wide in application range and capable of selectively removing short-circuit faults.

Description

technical field [0001] The invention relates to a battery group short-circuit joint cut-off protection device, which is applied to the operation protection of the battery group in the DC system of a substation, and belongs to the field of operation and inspection of the power system operation site. Background technique [0002] At present, the short-circuit fault of the battery pack in the substation can be divided into two categories. One is the short-circuit in the battery pack, which is usually caused by improper use of metal tools. , Improper use of insulating tools is prone to short-circuit faults across multiple batteries during the maintenance process. The other type is the short circuit of the positive and negative outlets of the battery pack. The positive and negative outlet cables of the battery pack pass through the cable interlayer, shaft or cable trench to reach the DC screen in the protection room. This part of the cable belongs to the "outlet" of the battery p...

AI Technical Summary

Problems solved by technology

Due to the harsh environment and lack of adequate protection measures, the "outlet line" of the battery pack is prone to short-circuit faults due to fire, mechanical damage, etc.

[0003] Since the short circuit of the battery pack is a DC short circuit, if there is no effective protection to cut off the fault point, the short circuit will cause devastating losses to the battery pack and the equipment around the short circuit point

If the fuse at the outlet of the battery pack refuses to operate, the short-circuit point cannot be cut off in the DC system, the charger is difficult to resume work, and the DC bus loses voltage for a long time

[0004] So far, there is no protection device that can effectively cut off the internal short circuit of the battery pack and the short circuit fault of the "outgoing line"

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