ABB REL 356 Current Differential Protection
4-11
Measuring Elements and Operational Logic
Figure 4-9. Mho Characteristic for Three Phase Faults
Phase to Phase
The phase to phase unit responds to all forward phase to phase faults, and some phase to phase to ground faults. The
operating and reference quantities are:
OP = (V
AB
– I
AB
Z
P
)
REF = (V
CB
– I
CB
Z
P
)
Figure 4-10. Mho Characteristic for Phase to Phase Faults
Summary of Contents for REL 356
Page 23: ...ABB REL 356 Current Differential Protection 1 10 Product Overview and Specifications ...
Page 83: ...ABB REL 356 Current Differential Protection 3 36 Settings and Application ...
Page 127: ...ABB REL 356 Current Differential Protection 5 28 Testing ...
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