±660kV银东直流输电对变压器噪声影响分析与对策

Analysis and Countermeasures of the Influence of ±660kV Yin-dong DC Power Transmission on the Transformer Vibration and Noise

银东直流是世界上首回±660 kV直流输电工程,是山东电网重要的受电通道。银东直流单极运行调试期间,山东电网多台220 kV及以上电压等级的变压器多次发生振动噪声增大的异常现象。针对国家重大工程运行中遇到的问题,详细描述了山东电网现场记录的多台变压器振动噪声异常的现象,分析引起振动的机理,通过对可能引起变压器振动噪声异常原因的分析判断和变压器中性点直流电流的监测,确定银东直流单极大地运行导致变压器振动噪声异常,并给出了预防性措施。

Yin-dong DC, an important power transmission line of Shandong grid,is the first±660kV electricity transmission project in the world.During the debugging of Yin-dong DC under monopole operation mode,several 220kV and higher voltage level transformers of Shandong power grid had abnormal vibration and noise several times.First,this paper describes the phenomena of abnormat vibration and noise of these transformers in detail.And then by analyzing the reasons that may cause the abnormal vibration and noise of transformers and monitoring the direct current going through the neutral point of transformer.This paper identifies it is the monopole grounding operation mode of Yin-dong DC that causes the abnormal vibration and noise of transformers.Finally,the preventive measures of the abnormal vibration and noise of transformers are provided.