Feasibility Study on Disengaging HV Shunt Reactors of 500kV Huishan Line Unlocked at Maohu Substation

After 500 kV Huishan line of Guangdong power grid unlocked at Maohu Substation,the failure rate of HV shunt reactors was high due to the change in the original configuration conditions of HV shunt reactors coupled with the rapid variation of power network structure and operation mode.Therefore,this paper carries out electromagnetic transient studies on decommissioning of HV shunt reactors at Shantou and Huizhou ends of the line,covering such aspects as power frequency overvoltage,closing and single-phase reclosing switching overvoltage,secondary-arc current and recovery voltage,and load rejection switching overvoltage under the operating and decommissioning conditions of HV shunt reactors.Studies have shown that the decommissioning of original HV shunt reactors of Huizhou-Maohu-Shantou channel is feasible.