|Method||Transformer Insulating Oil Tester|
|Standards||ASTM D 1816, ASTM D 877, IEC 60156|
The oil used in a transformer, irrespective of whether it is mineral or silicone. It has the primary functions of insulating the electrical components within the transformer and dissipating the heat generated during operation. If the oil begins to lose it’s ability to insulate effectively, transformer failure will follow.
A portion of the oil is poured into a bath with two electrodes separated at a predetermined interval depending on the exact method being applied. Current is applied until a spark is observed between the two oil-immersed electrodes at the point where the oil becomes an ineffective insulator.
The voltage at which the oil loses it’s ability to insulate effectively. The breakdown voltage should typically be significantly more than twice the rating of the transformer from which the oil sample was taken.
Back to Testing Methods