Judgment method of switch position of high-voltage direct-current control protection system

Abstract

The invention discloses a judgment method of a switch position of a high-voltage direct-current control protection system. The method comprises steps of firstly, using a closing signal and an openingsignal of a single switch as two input signals; allowing the closing signal and the opening signal passing through a first Not gate to pass a first AND gate, outputting and allowing an output signal and a closing position of the first AND gate to be subjected to logic operation successively, and using the exit thereof as the closing position for output; allowing the opening signal and a closing signal of a third NOT gate to pass through the second AND gate, outputting and allowing an output signal and the closing position of the second AND gate to be subjected to logic operation successively and using the exit thereof as the opening position for output; and when the input of the closing signal and the opening signal is 0, representing that there is a signal loss phenomenon and keeping theoutput of the closing position and the opening signal to be the states before the signal loss. According to the invention, problems of mistaken judgment and mistaken operation of the protection systemcaused by faults of a single element of a signal loop can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of high-voltage direct current transmission engineering, and in particular relates to a method for judging switch positions of a high-voltage direct current control and protection system. Background technique [0002] In the high-voltage DC control and protection system, the operation mode of the DC equipment is judged according to the position of the switch (knife switch), and the protection mode and protection setting value of the DC equipment are determined according to the operation mode. When the position of the switch (knife switch) is inconsistent with the actual situation, the protection will malfunction Or refuse to move. The position signal of the switch (knife switch) is judged by accessing the position signal or close signal of the control protection system. Under normal circumstances, only one of the position signal and close signal should exist. The common switch (knife switch) position judgme...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the object of the present invention is to address the deficiencies of the prior art and provide a method for judging the position of a switch in a high-voltage direct current control and protection system. Operation to accurately judge the real position of the circuit breaker. When the minute signal and the closing signal are consistent, the minute position output a

Images