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ABB PFEA111-20 with factory sealed box

For the unit type with earth fault directional features (ER/XR-relay type) the residual voltage UE in the secondary circuit of the voltage transformers is internally formed. In case no directional feature for the phase current path is necessary the residual voltage from the open delta winding can directly be connected to A3 and A2. See Chapter 4.5 for voltage transformer connections on isolated/compensated systems. 

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