Automatically-connected remote control grounded line disconnection and selection working method for low-current system

Abstract

The invention discloses an automatically-connected remote control grounded line disconnection and selection working method for a low-current system, and belongs to a remote control disconnected and connected line breaker method. The method comprises the following flows that: a central monitoring system sends a remote control command to a remote transformer substation; an on-site automatic line selection device in the transformer substation receives the remote control command and performs disconnection through a line measurement and control device; the line breaker performs disconnection and starts a connection loop to perform automatic connection instantly; although the line breaker performs disconnection and connection instantly, the measurement and control device acquires information indicating whether voltage is changed instantly; a programmable logic or judgment device generates a message of a bus voltage recovery state and processes the message; the programmable logic or judgment device judges whether to continue to pull the line or upload a line selection result according to a bus voltage recovery condition; and the operation is sequentially circulated until a grounded line is disconnected permanently. The invention has the advantages that: the power failure time of a user is shortened, and the operation time of the conventional line disconnection method is shortened to 1 second or so; and the method is easy to operate, high in performance, safe, reliable and high in practicability slightly influenced by a communication network environment and powerful.

Description

technical field [0001] The invention relates to a method for remote control of a small current grounding system for pulling and selecting lines. The utility model belongs to a method for automatically and logically judging a remote control switch circuit breaker. It is especially suitable for the single-phase grounding of the small current grounding system of 35kV and below. Due to many reasons such as the arc suppression coil being put into operation when the single-phase grounding of the line occurs in the small current grounding system, the grounding line selection device cannot accurately locate the grounding line. It is necessary to pull the route selection situation. Background technique [0002] With the rapid expansion of power grid lines, the monitoring center has more than 300 power supply lines of 35kV and below, covering more than 1,000 square kilometers in the suburbs. Single-phase ground faults often occur during operation, especially in severe weather condit...

AI Technical Summary

Problems solved by technology

It prolongs the power outage time of users, consumes manpower and material resources, increases the hidden danger of traffic accidents rushing to the substation, and is easy to misjudge

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