失灵保护的实现方案

Implementation schemes of failure protection

介绍了有关规程和反措对失灵保护的要求,分析了线路失灵保护和变压器失灵保护的起动逻辑。结合现场运行分析了微机失灵保护允许的几种起动方式的优缺点。针对微机保护特点提出了符合规程和反措要求的断路器失灵保护实现方案,并着重分析了旁路代主变高压侧断路器运行时失灵保护的实现方案,提出了设计建议方案和CT选用建议。

The paper introduces some relevant contents about failure protection in regulations and countermeasures,analyzes the startup logic of line failure protection and transformer failure protection. According to some startup modes permitted by microprocessor failure protection, it details the advantages and disadvantages in actual operation. Considering the features of microprocessor protection, it brings forward feasible schemes which are in accordance with regulations and countermeasures. It gives emphasis to analyze the scheme of failure protection when higher voltage breaker in transformer is replaced by bypass breaker and presents the proposal of design scheme and CT selection.