Introduction to Time of Drying Out Operation
Whatever be the method employed, the drying-out operation should be carried on until the transformer oil samples from the top and bottom of the tank depict high di-electric strength and the windings high insulation resistance. The real time needed relies upon several factors, like the condition of the windings, the quantity of moisture it has absorbed, the type and size of purifying plant, temperature of the oil that it can preserve etc., and may change from about a day for a small transformer to so far as a month for a large unit.
A significant point to keep in mind is that raising the temperature, will no doubt raise the rate of drying, but concurrently it also raises the thermal decomposition of the cellulose of the paper insulation that actually generates water vapour. Heating for longer time at temperatures above 900C is dangerous and should be avoided. It is in this context that drying-out within vacuum is of great value, because it decreases the time needed for drying. One test that confirms if the drying-out has been well done is to permit the transformer to cool down and test a sample of the oil after a week or fortnight. If the Breakdown Value (BDV) of it is high as also the insulation resistance, after making due allowance for the temperature on which the tests are taken place, it is a clear proof that the windings are quite dry.
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