Protection of the small busbar on the top of the high-voltage switchgear
Common methods of protecting busbars include overcurrent-based interlocking schemes, overcurrent-based differential protection, high-impedance differential protection, and percentage differential protection. A busbar protection must be capable of clearing all phase-to-earth faults, and in the case where they can occur, phase-to-phase faults. Policy regarding fault clearance times required from busbar protection varies from utility to utility. A busbar is a rigid, high-conductivity metallic conductor that serves as a common connection point for various electrical apparatus within a substation. Busbars have typically been left without dedicated protection, from the following reasons: It is a fact that the risk of a short circuit happening on modern metal clad equipment is insignificant, but it cannot be completely dismissed. Double Busbar with Couple r- In a double busbar with coupler arrangement, there are two independent busbars, each with its own set of incoming and outgoing circuits, connected by a bus.
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