... 3)SX460,SX440,MX321,MX341,R448,R449,YH-8A AVR for generator YH-8A is a half-wave phase-controlled ... thyristor type Automatic Voltage Regulator(AVR)and forms part of the excitation system for a brushless alternator, such as ... electromagnetic inerference filteringThermal drift0.03% per degree change in AVR ambientUnder frequency protection60Hz system presets knee point at 55HzFactory ...