一起变压器风冷系统电源切换故障分析及处理

One Case of Fault Analysis and Treatment on the Power Switching of Transformer Air Cooling System

针对一起220kV变压器XKPLCF-8/N型风冷系统电源切换回路故障,阐述了风冷系统电源控制原理,及手动与自动控制过程,经外部硬件回路检查和PLC程序逻辑检查分析,得出了该故障主要原因是PLC程序设计缺陷,对此采取有效措施,避免了变压器跳闸事故的发生,并提出了整改建议,为现场继保人员提供参考。

Aiming at a 220 kV transformer XKPLCF-8/N type air-cooled system power switching circuit failure,this paper describes the principle of power control of the air-cooled system,as well as the manual and automatic control processes.The external hardware loop inspection and PLC program logic inspection analysis show that the main cause of the failure is a PLC program design defect.Based on the analysis of the external hardware circuit inspection and the logic inspection of the PLC program,it was found that the main cause of the failure was a defect in the PLC program design.Effective measures were taken to avoid the occurrence of transformer tripping accidents,and rectification suggestions were proposed to provide a reference for the on-site relay personnel.