Power supply standby device for transformer substation achieved based on PLC

Abstract

The invention discloses a power supply standby device for a transformer substation achieved based on a PLC. The power supply standby device for the transformer substation achieved based on the PLC comprises the PLC, a bus detection circuit, an incoming line power supply detection circuit, a breaker control circuit, a breaker position signal acquisition circuit, a breaker control intermediate relay circuit, a breaker on-off indicating circuit, a standby action reset circuit and a breaker circuit, wherein the bus detection circuit, the incoming line power supply detection circuit, the breaker control circuit, the breaker position signal acquisition circuit, the breaker control intermediate relay circuit, the breaker on-off indicating circuit and the standby action reset circuit are respectively connected with the PLC, and the breaker circuit is connected with the breaker control intermediate relay circuit. The power supply standby device for the transformer substation achieved based on the PLC can overcome the defects that the fault rate is high, reliability is low and safety is poor in the prior art, and can achieve the advantages of being low in fault rate, high in reliability and good in safety.

Description

technical field [0001] The invention relates to the technical field of electric power equipment, in particular to a PLC-based power supply backup switching device for substations. Background technique [0002] Backup switch is the abbreviation of backup power automatic input, which is a safety automatic device designed to improve the reliability of power supply. The safe and reliable operation of the substation power supply is the premise and basis for the safe and stable operation of the substation. Substation station power backup system can automatically and quickly switch to the other station power supply in case of interruption of any one of the two station power supplies to ensure uninterrupted power supply for substation station loads. Therefore, the substation station power supply The backup system is very important to the safe and stable operation of the substation. [0003] The substation station power supply system usually adopts the single-bus section wiring mod...

AI Technical Summary

Problems solved by technology

[0007] At present, most substation power backup systems are relay-type devices. Due to problems in design and installation, or with the increase in operating years, individual substation power backup systems have problems since the beginning of substation operation. , most substation power backup systems fail after several years of substation operation, seriously affecting the safe and stable operation of substations

The relay-type substation power backup device uses many components, the installation and wiring are complicated, and the operation reliability is low

[0008] In the process of realizing the present invention, the inventor found that there are at least defects such as high failure rate, low reliability and poor security in the prior art

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