Oil has been used for a long time as an insulating medium in Transformers, HV Capacitors, XLPE Cables and Switchgear. It is also an effective coolant and transfer medium of various impurities from windings and paper insulation. It is necessary for Oil to be a perfect insulator as it was intended to be at the time of manufacture, for the HV equipment to function satisfactorily. But oil suffers from electrical degradation due to the contaminations and other electrical and mechanical stresses, rendering its properties ineffective for its intended purpose after sustained period of operation. Dielectric Breakdown Voltage testing of Oil is one such means to detect the voltage at power frequency at which it is likely to cause a flash-over. PE-AOBDV-M series of Automatic Oil Breakdown Voltage Testers are highly precise instrument, which can be used to conduct either a breakdown voltage test or do a proof (withstand) test. Usual available automatic test sets only perform the former function, but PE-AOBDV-M can do both.
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