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I
N
ROA (Relay Operate Angle)
ROA = 60 deg
REFPDIF never operates for any faults
external to the protected zone.
Currents 3I
o
and I
N
are theoretically
180
o
out of phase for any external
ground-fault.
ANSI05000724 V3 EN
Figure 44:
Zero sequence currents at an external ground fault
Uzs
Uzs
I
N
ANSI05000725 V3 EN
Figure 45:
Zero sequence currents at an internal ground fault
Section 6
1MRK 502 048-UUS A
Differential protection
122
Technical manual
Summary of Contents for 650 series
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