关键词: 随机失效, 状态评价, 继电保护, 可靠性, 修正

Abstract: This paper, in condition of considering random failure of the relay protection, describes and analyzes the random failure indicator and the random failure rate of relay protection. The analysis shows that the random failure indicator can describe the reliability of relay protection through the exponential function. According to the actual composition of the relay protection system, the relay protection reliability model is modified and improved based on random failure indicators, and the principles for determining the random failure rate parameters are determined. In addition, by assuming that the random failure rate is constant and independent of time, a practical relay protection random failure reliability function is constructed and a calculation method of random failure reliability of equipment is proposed. This method has been used in device status evaluation and analysis of relay protection in Chongqing electric power corporation. The application results show that this method can calculate the random failure probability of the relay protection equipment under certain conditions, and identify the equipment’s health status.

Key words: random failure, status evaluation, relay protection, reliability, modification