Figure 126: Ct Input Exclusion - 1.5 Cb Application; Figure 127: Ct Input Exclusion - Auxiliary Contact Connection - GE P642 Technical Manual

P64x
V01236

Figure 126: CT input exclusion - 1.5 CB application

The current transformer associated with CB1 is connected to the T1 CT input. Auxiliary contacts from CB1 isolators
1 and 2 must be connected to an opto-input as follows.
+V DC
-V DC
V01233

Figure 127: CT input exclusion - auxiliary contact connection

When isolators 1 and 2 are open, the opto-input L14 is energized and CT1 Exclu Ena is asserted. To set CT1
Excluded, T1 CT Phase A, B and C undercurrent elements must also be asserted.
P64x-TM-EN-1.3
1
CB1 2
Autotransformer
230/115/13.8 kV
CB4
98b - 1
98b - 2
Opto input 14
CB2
Auxiliary
services
CB5
1
Opto input 14 CT1 Exclu Ena
Chapter 13 - Monitoring and Control
277