直流输电工程换流变套管末屏电压异常解决方法

Solution of Voltage Abnormity at the Bushing Tap of Converter Transformer in HVDC Project

通过分析宁东工程银川站的换流变套管末屏电压测量回路,在回路原理和等效电路的基础上,分析了末屏电压异常的原因,提出了多种解决末屏电压谐振和畸变的办法和措施。有效消除了末屏电压发生的谐振和畸变,提高了直流系统和保护设备运行的可靠性,对现有直流工程中末屏电压测量回路的改造,以及未来直流工程中末屏电压互感器和接口设备的设计,有较大的参考价值。

By analyzing voltage measure circuit at the bushing tap mounted in converter transformer of Ningdong Project Yinchuan Station and based on circuit principle and equivalent circuit,this paper analyzes the causes of voltage distortion at the bushing tap and puts forward some methods and measures to voltage resonance and distortion,which is effective to eliminate ferromagnetic resonance and distortion and improve the reliability of operation for HVDC system and protection equipment,and of great value to the improvements of voltage measure circuit at the bushing tap in current HVDC project,as well as the design of the voltage transformer and interface device for the future HVDC project.