Issue
Customer would like to configure separate overcurrent protection for transformer primary and secondary on Sepam T87

Product Line
Sepam T87

Environment
SFT2841

Resolution

1. (Sepam settings -> CT/VT sensors) Configure the CT/VT Sensors. Note the locations of sensors (Ia, Ib, Ic) and sensors (I’a, I’b, I’c)
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2. (Protection settings -> 50/51) Select desired primary (Ia, Ib, Ic) or secondary (I’a, I’b, I’c) sensors for each unit from the “Measurement Origin” dropdown menu. These correspond to the line diagram configured in step 2
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3. (Protection settings -> 50/51) Verify desired measurement origin is selected, click the corresponding “On” checkbox and click “Apply” to apply changes
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4. (Protection settings -> 50/51) Configure tripping curves for each unit as required

* Please note that primary current I connects to B1 on the relay and secondary current I' connects to B2 on the relay. For the Sepam 80 wiring schematic, please refer to SEPAM Series 80 Wiring Diagram .

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