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b. Procedure. Maintain bushings and terminals of instrument transformers as described in section VII. Maintain fuses, if present, as described in chap­ter 8, section II.

(1) Case. Inspect case or tank for evidence of corrosion and leaks. Clean and paint as required. Instrument transformers that show evidence of leaks should be replaced with those of the same rating and returned to a shop for repair.

(2) Conduit and connection. Tighten all loose joints in conduit around fittings, terminal boxes and supporting clamps. Clean and paint corroded areas. Verify tightness of all bolted connections. Verify that wiring, grounding, and shorting connections provide good contact.

(3) Drawout mechanisms. Test the proper op­eration of the voltage transformer withdrawal mechanisms (tip out) and grounding operation.

3-30. Tests of instrument transformers.

Instrument transformers rated above 15 kilovolts should receive power factor tests during the sched­uled maintenance period for transformers given in table 7-1.

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