一起换流变压器分接开关档位故障分析

Analysis of a Case of Tap Fault Encountered by a Tap Changer of an Actual Converter Transformer

通过一起实际案例,分析了换流变压器分接开关档位故障的原因。阐述了档位故障时档位的机械指示与上送的档位信号间的差异及其原因。通过检查分接开关相关设备确定了故障原因。进一步,分析了换流变压器分接开关自动控制同步原理,从而解释了故障过程中分接开关发生误动作的原因。此外,还提出了换流变压器分接开关运维措施。

This paper focuses on seeking the reason that causes tap faults of converter transformer tap changers through an actual fault case.It first reports the difference between the mechanical tap position and the transmitted tap signal which was observed after fault occurrence by on-site examination and its underlying mechanism,as well as the analysis on the fault cause on the basis of inspection results of relevant equipment.It further gives explanation to the unexpected action of tap changer during the fault process by using the principle of automatic control synchronization of the tap changer.Additionally,it puts forward suggestions on maintenance measures of converter transformer tap changers.