Electric power system protection method and rapid opening type permanent magnet circuit breaker switch equipment

Abstract

The invention discloses an electric power system protection method and rapid opening type permanent magnet circuit breaker switch equipment. The method comprises the steps of subdividing an electric power system in a protection region into five stages of differential protection, and setting rapid opening type permanent magnet circuit breaker switch equipment in each stage of differential protection region; and when a single-phase grounding fault or an inter-phase fault occurs in an electric power system, cutting off a fault line through the rapid opening type permanent magnet circuit breaker switch equipment. In order to implement the method, the invention provides the rapid opening type permanent magnet circuit breaker switch equipment with the inherent opening time not more than 5ms. Byadopting the switch equipment, the electric power system can be divided into 300ms, 225ms, 150ms, 75ms and 0ms five levels of differential protection power grids. The switch equipment can be widely applied to a 10-35kV power system, especially to a domestic 10-35kV alternating-current power distribution network system, a fault line can be cut off more quickly, the power failure range is effectively narrowed, and the power failure time is shortened.

Description

technical field [0001] The invention relates to a relay protection technology and an applied switchgear, in particular to a power system protection method and a fast-opening type permanent magnet circuit breaker switchgear. Background technique [0002] Switchgear is a very important part of the power transmission and distribution system. With the continuous deepening of urban and rural power grid transformation, especially with the development of the national economy and the improvement of urbanization, electric power is a supporting industry for the national economy. All switchgears are based on spring operating mechanism. With the improvement of residents' living standards and the continuous development of industrial levels, power customers have also put forward high requirements for the quality of power consumption. Power outages will affect the development of the national economy. At the same time, due to the occurrence of system voltage sags caused by power outages, I...

AI Technical Summary

Problems solved by technology

Limited by the inherent opening time of the spring mechanism switchgear cannot be shortened, the power supply cannot be further subdivided, and the spring operating mechanism has a large number of parts and complex transmission, and the failure rate itself is relatively high, especially when it is placed outside the box , It also brings mechanism corrosion and other phenomena that easily lead to equipment failures, resulting in frequent power outages

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