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    How to wire Current Transformers (CT) on Sepam Series 80 relay for differential protection (ANSI 87)

    Issue
    Need to know how to wire CTs for differential protection (ANSI 87) on the Sepam Series 80 relay and what type of current values it generates.

    Product Line
    Sepam 80 Series

    Resolution

    Wiring Current CTs for Differential Protection (ANSI 87)

    Feeder

      

    For feeder applications:

      • CTs located on primary side of transformer or motor are wired to B1 using a CCA634 connector and produce a Ia, Ib & Ic current.
      • CTs located on secondary side of transformer or motor are wired to B2 using a CCA634 connector and produce a I'a, I'b & I'c current.
    Main

    For Main applications:

      • CTs located on primary side of transformer or generator are wired to B2 using a CCA634 connector and produce a I'a, I'b & I'c current.
      • CTs located on secondary side of transformer or generator are wired to B1 using a CCA634 connector and produce a Ia, Ib & Ic current.

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