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what is the main purpose of line PT and bus PT?
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Answer Posted / dipankar chatterjee
Line PT monitor the healthiness of line feeders. O/v, U/v, Underfluxing and overfluxing, Trip ckt supervision, Directional overcurrent etc apart from distance protection and voltage for auxiliary relays. Bus PT is preferred for double bus system to have synchro check and bus voltage. Fault in line PT can shutdown the line feeder only but Bus PT fault will Trip all outgoing feeders. Preferably, Transformer feeders should have line PT only if single incomer with multiple outgoing feeders in 132 kV system.
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