1.Small wave aberration of output voltage 2.Long life ,reliable operation ,maintenace ... OIL IMMERSED VOLTAGE REGUALTOR ADOPTS FLUME NEW ARTS WITH GOOD WAVE , IT IS UP TO THE IEC REQUIREMENTS OF ELECTRIC TEST ... VOLTAGE SMOOTHLY AND STEPLESSLY AND WITH THE ADVANTAGES OF SMALL WAVE ABERRATION OF OUTPUT VOLTAGE , LONG LIFE , RELIABLE OPERATION , CONVENIENT USE ...