某大型水电站高压厂用变压器及励磁变压器温度过高跳闸回路优化

Circuit Optimization for Tripping Cause by High Temperature of HV Auxiliary Transformer and Excitation Transformer in A Large Hydropower Station

某大型水电站高压厂用变压器和励磁变压器温度过高动作于跳闸,跳闸回路的可靠性直接关系到机组的安全稳定运行。随着自动化元件长时间投入运行,温控箱和测温探头出现故障频率增加,由于温度过高跳闸回路存在设计不合理的问题,这些自动化元件的故障可能导致误出口,直接造成机组非计划停运事故。通过分析原跳闸回路存在的问题,提出两种回路优化方案,对比两种方案优缺点,选择适合电站的方案。

HV auxiliary transformer and excitation transformer in a large hydropower station are tripping because of high temperature,and the reliability of tripping circuit is directly related to the safe and stable operation of the unit.As the automatic components are put into operation for a long time,the failure frequency of the temperature control box and temperature probe increases.Due to the unreasonable design in the tripping circuit due to high temperature,the failure of these automaticcomponents may lead to the wrong exit and directly cause non-stop accident of the unit.By analyzing the existing problemsof the original tripping circuit,two optimization schemes for the circuit are proposed,the advantages and disadvantages of these two schemes are compared,and the suitable scheme for the hydropower station is given.