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Leave a comment. Switchgear refers to electrical tool that regulates the flow of electricity within an electrical system. It is used by utility providers and hidden facilities alike for two reasons: to prevent overloads and short circuits, and to de-energize circuits for testing and maintenance.
True bus differential relaying compares all currents entering and leaving a switchgear bus. Within the. limits of the accuracy of the CT's and the relays, true bus differential relaying will detect all faults on the. protected bus. Since all currents are taken into account, the relays can be very fast.