Spare power automatic switching device and method for three-segment bus two-segment switch

Abstract

A three-busbar two-section switch standby self-casting apparatus, belonging to power distribution field, includes two power supply lead-in circuit breakers, three busbar segments and two section breakers. Two standby self-casting devices being mounted on the position of the two section breakers; the standby self-casting device being equipped with a current detection loop, a voltage detection loopand a control circuit; the current detection loop using the signal of a two-path lead-in current transformer as ''non stream'' criterion, and using the current signal of the corresponding section breaker as ''over current'' criterion; while the voltage detection loop using the voltage signals of the two busbar segments, neighboring the corresponding section breaker, as ''pressure / non-pressure'' criterion. The standby power supply self-casting device includes a electrification discrimination circuit, a first and a second startup condition judgment circuit, a standby self-casting motion circuitand a rear acceleration motion circuit. The invention also discloses standby self-casting method for the apparatus. The apparatus implements power supply rapid automatic switching when the lead-in isfailure under different running modes of the three-section busbar, and ensures the power supply reliability under accidents status.

Description

A three-section busbar two-section switch standby automatic switching device and standby automatic switching method technical field The invention belongs to the field of control devices or systems for power supply and distribution, and in particular relates to a switching-on / off device for emergency or standby power. Background technique Backup self-injection device, that is, the backup power automatic input device (or called the backup power automatic input device), is an automatic device installed in the power system to improve the reliability of power supply. Continuous power supply plays an important role. Its function is to quickly disconnect the working power supply and put the standby power supply into operation when the working power supply disappears due to failure or other reasons. The backup self-injection device is a simple logical operation in terms of logical principle, and its reliability directly affects the safe and stable operation of the entire substati...

AI Technical Summary

Problems solved by technology

The design of the backup auto-switching device should avoid seeking perfection. Any device that unrealistically seeks to adapt to all fault situations or even imagined rare fault situations will greatly reduce the reliability due to the overly complicated auto-switching logic.

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