Research and development of UHV AC transformer and shunt reactor

SUMMARYThe Jingdongnan‐Nanyang‐Jingmen UHV AC Pilot Project has already been put into service in China. In this paper, insulation level of power transformer and shunt reactor for 1000 kV power transmission project in China are introduced. UHV AC transformer and shunt reactor structures are given. Key technologies, including cooling type, regulating method for UHV AC transformer, pattern of outgoing line, and noise controlling, are discussed. Besides, due to the high voltage class, high capacity, and super size of UHV power transformer, the size of its test circuit is correspondingly enlarged, the impacts of stray inductance and capacitance will be more intense consequentially, thus in factory test including lighting impulse test, switching impulse voltage test, short‐duration induced AC voltage test at 500 kV side, and long‐duration induced AC voltage test with partial discharge measurement are presented. Copyright © 2011 John Wiley & Sons, Ltd.