ECN Forum Forums Technical Discussion Electrical Theory and Applications Generator load hunting problem

Three generators (1000KVA,800Kw,415V)are running in parallel almost on 500Kw each,but generator A is variating form 50 to 1500Kw when it runn on 400Kw (this was measured on recorder,it measures the both min & max vales) while the actuator voltages are constatnt.Please tell me the cause of load hunting.