GE MiCOM P40 Agile - Figure 43: Phase Current Differential Protection Logic for Feeders with In-Zone Transformers

10.5 LOGIC FOR FEEDERS WITH IN-ZONE TRANSFORMERS
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Permit Cdiff
Phase A Operate LS
threshold reached
1 R
Q
SD
IDiff>Start A
IDiff>Start B
IDiff>Start C
Phase B Operate LS
threshold reached
Phase C Operate HS
threshold reached
Receive Inhibit C Diff
Inhibit C Diff
&
&
&
&
&
&
1
IDiff>>Start A
IDiff>>Start B
IDiff>>Start C
Phase A Operate HS
threshold reached
&
&
Phase B Operate HS
threshold reached
Phase C Operate LS
threshold reached
&
&
&
&
1
Ih(2) Block A
Ih(5) Block A
1
Ih(2) Block B
Ih(5) Block B
1
Ih(2) Block C
Ih(5) Block C
Figure 43: Phase Current Differential Protection logic for feeders with in-zone transformers
Chapter 6 - Current Differential Protection P543i/P545i
120 P54x1i-TM-EN-1