Figure 210: Positioning Of Core Balance Current Transformers - GE MiCOM P40 Technical Manual

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Figure 210: Positioning of core balance current transformers

If the cable sheath is terminated at the cable gland and directly earthed at that point, a cable fault (from phase to

sheath) will not result in any unbalanced current in the core balance CT. Therefore, prior to earthing, the

connection must be brought back through the CBCT and earthed on the feeder side. This then ensures correct

relay operation during earth fault conditions.

P446SV-TM-EN-1

Cable gland/shealth

earth connection

No operation

Chapter 13 - Current Protection Functions