Circuit breaker control loop reliability evaluation method and device

Abstract

The invention discloses a circuit breaker control loop reliability evaluation method and a device. The method comprises the steps: constructing a control loop reliability block diagram according to the basic principle and related devices of a circuit breaker control loop; determining a minimum path set according to the control loop reliability block diagram; determining a structure function according to the minimum path set; obtaining the reliability of the related devices; and calculating the reliability of the control loop according to the structure function and the reliability of the related devices. In the aspect of reliability evaluation modeling of the circuit breaker control loop, a reliability probability model is established mainly according to the structure of the circuit breakercontrol loop, the functions of elements in the circuit breaker control loop and the logic relationship between the circuit breaker control loop and the elements in the circuit breaker control loop, and the model is accurately solved through recursion or iteration and other processes, so that the reliability index of the system is calculated. The method is clear in physical concept and high in model precision.

Description

technical field [0001] The present application relates to the technical field of relay protection, in particular to a method and device for evaluating the reliability of a control circuit of a circuit breaker. Background technique [0002] As the first line of defense to ensure the safety of the power grid, the reliable operation of the relay protection system is of great significance to the safety and stability of the power system. Its misoperation and refusal to operate are also important factors that trigger or accelerate system disturbances and cause large-scale collapse of the power grid. Since the 1960s, blackouts in many countries have provided an opportunity for the development of power system reliability research. The theoretical methods and engineering application technologies of reliability assessment have begun to mature. In view of the influence of relay protection and safety control devices on system reliability Due to the important influence and the complexity...

AI Technical Summary

Problems solved by technology

[0004] The purpose of this application is to provide a method and device for evaluating the reliability of a circuit breaker control circuit to solve the problem of making assumptions about the basic data required for reliability evaluation in the analysis process and doubting the reliability of reliability evaluation

Images