High-voltage cable ground fault detection cut-off circuit in power distribution equipment system

摘要

ZVT and EVT are provided in a base block of a power distribution facility system. When a predetermined condition is met, zero phase voltage detection by ZVT and zero phase current detection by EVT for a power company distribution station are performed. High voltage cable ground fault detection cut-off circuit in power distribution system that shortens the time required to change the system and simplifies the change work by providing a configuration to switch to phase voltage detection and zero-phase current detection system by EVT of the base block I will provide a. An electric power company distribution station EVT1 is installed in a high-voltage cable before being supplied to a base block, a connection means capable of connecting an insulation transformer is provided in the middle part of the base block, and further via a high-voltage circuit breaker It is configured to be connected to a high-voltage cable that starts and extends other base blocks or G / C, etc., detects a zero-phase voltage ZVT, forms an earth fault current circuit EVT, and detects a zero-phase current It consists of an AND circuit that takes the logical product of the detection signals of ZCT, zero-phase voltage and zero-phase current, and a relay. [Selection] Figure 1A