300 Mvar调相机大轴保护方案的研究

Research on Shaft Protection Scheme for 300 Mvar Synchronous Condenser

针对目前调变组保护装置未配置调相机大轴保护的现状,分析了调相机轴电压产生原因及其带来的危害,阐述了调变组保护装置增配大轴保护的必要性,提出基于轴电压、轴电流复合判据的大轴保护方案,对方案的数据采集、处理、保护逻辑以及可实施性进行了阐述。该方案对轴电压持续异常或轴电流越限可即时发出告警或跳闸,同时可以为运行单位合理安排调相机检修计划或事故后综合分析提供参考数据。

The synchronous condenser-transformer unit protection device is not equipped with shaft protection.The paper analyzes the causes and hazards from shaft voltage of synchronous condenser and expounds on the necessity of shaft protection for the unit. Besides, it proposes a shaft protection scheme based on an integrated criterion of shaft voltage and shaft current and expounds its data acquisition, processing, protection logic,and actionability. The scheme can trigger an alarm or tripping for continuous shaft voltage abnormity or current overlimit and can provide a reference basis for the operation unit to arrange a maintenance plan or postaccident analysis on the synchronous condenser.