旧变电站断路器失灵保护改造探讨

为解决旧变电站母线保护与失灵保护不满足配置要求的问题，提出新上一套两者合一的微机型保护装置。论述了两种可行的改造方案：（1）取消各间隔原断路器保护，由线路保护动作触点直接启动失灵；（2）保留各间隔原断路器保护，利用断路器保护的触点启动失灵。通过比较两方案的优缺点和适用范围，选择了改造涉及范围小的方案二。针对方案二，提出一种失灵电流定值的整定方法，即应将断路器保护和失灵保护的失灵电流定值整定相同。此方案已在天津市电力公司某500 kV变电站投入使用，运行情况良好，未发生误动。

Discussion on the improvement of breaker failure protection for old substations

Bus protection and breaker failure protection of old substations can't meet the configuration requirements.A new microprocessor-based protection which contains bus protection and breaker failure protection is proposed to solve the problem.Two retrofit options are discussed:(1)cancel the original breaker protection of each interval,and start failure protection directly by contacts of line protection;(2)retain the original circuit breaker protection of each interval,and start failure protection by contacts of...