ABB RELION REX640 Technical Manual page 673

1MRS759142 C
REX640
Technical Manual
GUID-A2EDE3D7-8102-4AF5-8E4D-8CFF6A421022 V1 EN
Figure 367: Connection of the current transformers of Type 1. The connected
phase currents and the neutral current have opposite directions at an
external earth-fault situation. Both earthings are outside the area to
be protected.
GUID-8787F0CF-6B67-4551-A1A2-A2EA3EA43E52 V1 EN
Figure 368: Connection of the current transformers of Type 2. The phase currents
and the neutral current have equal directions at an external earth-
fault situation. Phase earthing is inside and neutral earthing is outside
the area to be protected.
Section 4
Protection functions
667