Epoxy Resin Casing Inspection Process
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The epoxy resin cast bushing stage of the inspection carries out full-size inspection and sampling destructive test. The wall thickness is tested with an ultrasonic thickness gauge, and 4 points are measured on the same epoxy bushing manufacturer section, with a deviation of no more than ±0.1mm. The electrical strength test is in accordance with the GB/T1408 standard, with a power frequency withstand voltage of 30kV/1min without flashover. The epoxy bushing for transformer sampling is subjected to bending test, and the product is qualified if there is no crack when the bending radius is ≤3 times the pipe diameter.
