【摘要】 自2002年12月500 kV 直流输电开始单极对地的调试和运行以来，附近的500kV 交流变电所主变压器出现噪声大幅度上升(上升21dB )等问题。研究分析了直流输电的地中直流电流对交流电网设备影响，包括直流偏磁对变压器和电流互感器、电网谐波对继电保护装置及地中直流对变电所接地网腐蚀的影响，提出了变压器中性点注入反向直流电流限制变压器直流偏磁的措施。更多还原

【Abstract】 Since the 500 kV direct transmission project began to be commissioned and put into operation by unipolar earthing inDec.2002,the noises of the 500 kV main transformers in Wunan substation increase significantly.This paper discusses theimpact of geomagnetically induced current upon AC electric network equipment in DC transmission including transformer,current transformer,electric network harmonic wave,relay protection equipment and the corrosion of substation earth screen.The measures to control the DC magnetic biasing in transformers are presented.更多还原