摘要
讨论了直流输电系统大地电流对国华台山发电厂主变压器的影响,计算比较了分别采用电容隔直法、小电阻限流法、反向电流限制法和电位补偿法消除该电厂变压器中性点直流电流的优缺点,校核验证了在广东省220kV及以上电网夏季大、小运行方式下国华台电1、2号主变中性点增加电容隔直装置对现有保护配置与整定的影响,确定了采用电容隔直法来抑制该电厂主变压器中性点直流电流。
The influences of ground current in HVDC power transmission system on main transformer of Guohua Taishan power plant are researched. The merits and demerits of four measures to eliminate the DC current in neutrals of main transformers in this power plant, such as connecting DC-isolation capacitor in series with the neutral, current restriction by adding small resistance to the neutral, injecting reverse DC current into the neutral and potential compensation, are compared by calculation results; the influences of connecting DC-isolation capacitor in series with neutrals of main transformers No. 1 and 2 in Guohua Taishan power plant on configuration and setting of existing protection under summer maximum and minimum operation modes of 220kV and above power networks in Guangdong province are checked and verified, then it is recommended to connect DC-isolation capacitor in series with the neutral to eliminate DC current in neutrals of main transformers of this power plant.
出处
《电网技术》
EI
CSCD
北大核心
2009年第6期33-38,共6页
Power System Technology
