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What is the reason for using a current transformer in an electrical service substation?
A current transformer is primarily used at the neutral point of a transformer for earth fault protection. A neutral current transformer will measure any ground fau…lt current which will essentially flow from the star point of the transformer. A fault-detection device other devices is connected to the current transformer and, if the fault current exceeds a certain trigger value, the fault-detection device will give a trip command to an earth-fault relay to disconnect the supply of electricity to the transformer. Additional Answer Current transformers are widely-used in substations to (a) allow the measurement of currents in the high-voltage lines, and (b) to operate protective relays. There are many different types of protective relays, and their function is to disconnect faults by (a) detecting them, and (b) tripping the appropriate circuit breaker(s). (MORE)
