What is the current transformer?
CURRENT TRANSFORMER – Current transformers are used with ammeters, watt meters, power-factor meters, watt-hour meters, compensators, protective and regulating relays, and the trip coil of circuit breakers. One current transformer can operate several instruments, provided that used to the combined burden does not exceed that for which the transformer is designed and compensated. The current transformer is connected directly in series with the line.
How often to maintain CURRENT TRANSFORMER?
At least once a month
➢ Visual Inspection to check oil level and defects or possible oil leaks.
At least once a year
➢ Check all screwed joints & contact for tight fit.
➢ Clean insulators if necessary, when an excessive amount of
accumulated.
➢ Check primary and secondary connectors and conduct necessary tightening.
Note: Never open a secondary winding of a CT while on service.
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