The busbar is used as a conductor and is used as a connection between the parallel and the feeder. The feeder is the supply, and it handles the relays.
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In an electrical power transmission system: the grid is what the feeder feed into.
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Busbar current rating for 1 square inch is 1000a.
high impedance circit provides a varistor unit which has stabilising resistor which ll protect the relay from being operating for maloperations like through fault, CT faults whereas this varistor unit is provided internally in an numerical relay where the CT of class 5P can be used.
There is no tapping from the feeders. In other words, the current loading of a feeder is the same along its entire length.Various tappings are taken from the Distributors. Hence, a distributor has distributed current loading along its entire length.