Answer / antaratara ghosh

Line PT is connected in the incomer (line) to detect the
voltage of the incomer whereas bus PT is connected in the
bus, 1 before the bus coupler and another after bus
coupler, to detect voltage in the bus.

The main purpose of both of them is to sense the voltage so
that the breaker can get enough information to operate..

Answer / maloy

line pt is connected in incomer where the bus pt is connectd in the main bus bar though both funtioning the same for measurement & protection

Answer / muhammad abid ali shah

Line PT is used to measured the voltage and also used for voltage protection means that under voltage or over voltage and the bus PT is used for metering and measure the voltage of bus bar voltage.

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