±800kV特高压直流线路跳线上绕耐张塔研究

Research on Upper Jumper Cross-arm Tension Tower for ±800kV UHVDC Transmission Line

摘要:

针对220kV 某变电站主变压器噪声异常的情况，通过分析运行工况，对噪声振动、中性点直流量进行测试及分析，并将主变压器噪声异常时的时间与德阳换流站切换单极大地回路运行的时间进行对比，发现该主变压器噪声异常的原因是德阳换流站直流接地极电流导致其发生直流偏磁，直流接地极电流导致单相三柱式变压器噪声异常的距离可达到300km。

Abstract:

In view of the abnormal noise of the main transformer in a 220kV substation，the operating conditions are analyzed，and the noise vibration and the neutral point direct current are tested and analyzed． Moreover，the time when the main transformer has abnormal noise is compared with the time when the De－yang converter station switches to the monopolar earth return operation mode． It is found that the reason for the abnormal noise of the main transformer is the DC bias caused by the DC grounding current of De－yang converter station，and the distance that the DC grounding current of the single－phase three－column transformer causes abnormal noise can reach300km．