ABB RELION REX640 Technical Manual page 754

Protection and control

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Protection functions

Figure 425: Connection of the current transformers of Type 1. The connected phase

currents and the neutral current have opposite directions at an external earth-fault

Figure 426: Connection of the current transformers of Type 1. The connected phase

currents and the neutral current have opposite directions at an external earth-fault

1MRS759142 F

Technical Manual