Analysis and Prevention of Generator Loss of Excitation Caused by PT Voltage Loss
During trial operation of an actual hydroplant,it encountered an overcurrent protection activated shutdown acci-dent caused by PT secondary side voltage loss induced action refusal of loss of excitation protection.In view of this acci-dent,this paper describes the harm to generator and power system due to loss of excitation,analyzes and seeks cause of the accident,and formulates corresponding improvement measures for voltage secondary circuit and excitation regulator.The paper may be useful to avoid PT secondary side voltage loss and asynchronous operation or even loss of excitation of generators.