启备变压器防过投分析及解决方案

Analysis and Solutions of Startup/Standby Transformers' Antioverloading Activation in a Power Plant

分析了某电厂在单条出线的情形下,线路故障导致2台机组同时跳闸的情况,以及不同机组运行工况下厂用电切换时启备变过电流状况。根据分析结果对启备变压器运行安全及存在的各种问题进行了论证,提出了解决措施,可供同类型的电厂参考借鉴。

The paper analyzes the situation that two units trip at the same time resulting from the line fault in single outgoing line of a power plant and the overcurrent condition of startup standby transformer caused by the auxiliary power switching in different operating conditions of units. Meanwhile, this paper discusses the operation safety of the startup standby transformer and relevant problems based on the analysis result, and puts forward corresponding solutions, which can be used as a reference for power plants of the same type.