台山电厂变压器直流偏磁研究与防治

Transformer Biasing Analysis and Limitation in Taishan Power Plant

回顾台山电厂几起典型直流偏磁事件,讨论直流输电大地电流对交流电网影响等效网络的简化原则。应用极地电阻网络分析高肇直流对台山电厂变压器直流偏磁的影响以及台山电厂变压器中性点直流电流的变化规律,比较小电阻限流法、电容隔直法、反向电流限制法和电位补偿方法的优缺点,提出抑制台山电厂变压器中性点直流电流的工程建议。

This paper discusses the equivalent principle of AC power network under DC ground current, analyzes transformer biasing in Taishan power plant raised by Gaozhao HVDC transmission line fault, describes the basic characteristic of Taishan transformer neutral current, compares the strongpoint and shortage of resistance, capacitor, reverse DC injection and potential compensation methods to eliminate DC current in transformers, neutral and recommends a scheme to be applied in Taishan power plant.