ABB Relion REC615 - Page 246

Figure 126: Single-phase earth fault, phase A
In an example of the phasors in a two-phase short-circuit failure where the fault
is between the phases B and C, the angle difference is measured between the
polarizing quantity U
AB
and operating quantity I
B
- I
C
marked as φ.
Protection functions
1MRS758755 C
246 REC615 & RER615
Technical Manual