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 ELECTRICAL
Distribution Transformer-Continued
test insulation resistance. Refer to NAVFAC MO-200
measure load current with recording meter over period of time
when load is likely to be at its peak
measure peakload voltage
make regulation tests and tests of operating temperature during
peak-load-current tests
test and calibrate thermometers or other temperature alarm systems
ASSOCIATED EQUIPMENT. Check for:
n Concrete Foundations and Supporting Pads:
settling and movement
surface cracks exceeding 1/16 inch in width
breaking or crumbling within 2 inches of anchor bolts
n Anchor Bolts:
loose or missing parts
corrosion, particularly at points closest to metal base plates and
concrete foundations resulting from moisture or foreign matter, and
exceeding 1/8 inch in depth
n Mounting Platforms, Wooden:
cracks
breaks
signs of weakening around supporting members
rot, particularly at bolts and other fastening, holes through which
bolts pass, wood contacting metal
burning and charring at contact points, indicating grounding
deficiency
inadequate wood preservation treatment
n Mounting Platforms, Metallic:
deep pits from rust
corrosion
other signs of deterioration likely to weaken structure
7-11
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