Self-powered automatic switching and closing high-voltage control system

Abstract

The invention discloses a self-powered automatic switching and closing high-voltage control system, which comprises a main power supply, a spare power supply and a high-voltage cabinet control circuit, wherein a self-powered device is arranged between the main power supply and the spare power supply, and the self-powered device comprises main and spare direct-current power supply branches; the main and spare direct-current power supply branches comprise main and spare voltage transformers connected in parallel with the wire inlet ends of the main and spare power supplies respectively, the output ends of the main and spare voltage transformers are connected with main and spare middle isolating transformers respectively, the output end of the main middle isolating transformer is connected in parallel with coils of a main rectifying electric bridge and a direct-direct switching relay at the same time, the output end of the spare middle isolating transformer is connected with a spare rectifying electric bridge, and the output ends of the main and spare rectifying electric bridge are connected with the power supply input ends of the high-voltage cabinet control circuit and an automatic switching and closing device through contacts of the direct-direct switching relay. The system not only can provide uninterrupted power supply for the high-voltage cabinet control circuit, but also can realize automatic switching of the main and spare power supplies.

Description

technical field [0001] The invention relates to a high-voltage control system, in particular to a high-voltage control system with self-power supply and automatic switching and closing. Background technique [0002] In the power system, for important users or substations that require high power supply reliability, two or more power supplies must be provided. As a working power supply, the rest of the power supply is used as a backup mode of operation. At the same time, it is equipped with an automatic switching switching system for the standby power supply. When the working power supply fails for some reason, the automatic switching switching system for the standby power supply will quickly switch to the standby power supply, so that users or substations can regain power. However, the precondition of the automatic switching and closing function of the standby power supply is a reliable operating power supply, so a device for self-power supply is urgently needed. [0003] l...

AI Technical Summary

Problems solved by technology

[0004] However, nowadays, more and more units adopt two main and backup 10kV high-voltage power supplies to enter the household, especially those who use electricity as a first-level load unit. Because of the unreasonable original high-voltage control system, it brings a lot of inconvenience to users and violates the The power supply policy requirements of "uninterrupted, high-quality, economical and safe"

At present, the operating status of commonly used control systems is as follows: 1. The uninterruptible power supply supplies power to the high-voltage control system, so that all functions of the high-voltage control system can run; one circuit in the circuit is powered off, and the other circuit must be closed by manual operation; all high-voltage control cabinets There is a certain distance between the control switches, and it takes 6-7 minutes to manually complete the switching and closing operation procedures, which largely causes unnecessary economic losses

2. The DC 220 power supply used in the high-voltage control system is provided by adding a UPS power supply with AC 220V and adding a bridge rectification circuit to provide for the system. However, due to the short use time of the UPS power supply, and the battery needs to be replaced and maintained frequently and other reasons, this method cannot guarantee the long-term normal operation of the vacuum circuit breaker and relay protection

Images