A kind of high and low voltage dual power supply dual ring network power supply system and backup automatic switching control method

Abstract

The invention discloses a high and low voltage dual power supply double ring network power supply system, which includes No. 1 power distribution room and No. 2 power distribution room. The main line of power supply A and the main line of power supply B respectively pass through No. 1 power distribution room and are connected to the high-voltage side of No. 2 power distribution room through a high-voltage circuit breaker. In No. 1 power distribution room, the main line of power supply A and the power supply The B main lines are connected through the DL1 circuit breaker, and the DL1 circuit breaker is connected with a backup self-switching device. A and power supply B jointly supply power, and each power supply can form a closed-loop power supply loop, so as to solve the problem that in the prior art, one trunk line and another trunk line of each power supply are connected to form a power supply consisting of multiple The ring network of the power input is prone to technical problems of open-loop operation when the power supply is damaged, causing a power outage.

Description

technical field [0001] The invention relates to the technical field of high and low voltage power supply, in particular to a high and low voltage dual power supply double ring network power supply system and a backup self-switching control method. Background technique [0002] With the development of urban construction and social economy, users have higher and higher requirements for power supply. More and more places use ring network wiring to form a network to connect the power supply network into a ring. When a power failure or failure occurs in any segment in the ring, the segment can be cut off through the switch, and the ring network can be decomposed into open-loop operation, so that the normal power supply of other segments will not be affected. Ordinary ring wiring is to connect the ends of different two-circuit distribution lines within the power supply range of the same power supply to form a ring network. The handle ring type is a power supply network that opera...

AI Technical Summary

Problems solved by technology

When a certain power supply and some lines or equipment in the ring fail at the same time, the ring network will become an open-loop operation, and some users who can normally supply power will experience power outages.

And when the low-voltage ring network supplies power, when the low-voltage bus of the power system loses voltage, only the dual-power switching device is used without judging the capacity of the main transformer and the load rate of the bus, which may cause overloading of the transmission line. Can not guarantee the reliability of power transfer

[0005] The backup self-switching device lacks intelligence. Each circuit breaker is equipped with its own backup self-switching protection device. The monitoring information is generally only the electrical quantity information on both sides of the circuit breaker and the operating status of the circuit breaker body, which is lacking for analysis and judgment of faults. There are few types of data information, and it is impossible to comprehensively analyze the power flow situation within the scope of the jurisdiction grid, which is prone to misoperation and cause large load fluctuations and reduce power quality

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