Core Balance Current Transformer - High Transformation Ratio, Earth Leakage Protection | Zero Sequence Detection For Reliable Fault Management

The Core Balance Current Transformer, also known as a zero sequence CT, is used for earth leakage and earth fault protection. The concept is similar to the RVT. In the CBCT, the three core cable or three single cores of a three phase system pass through the inner diameter of the CT. When the system is fault free, no current flows in the secondary of the CBCT. When there is an earth fault, the residual current (zero phase sequence current) of the system flows through the secondary of the CBCT and this operates the relay. In order to design the CBCT, the inner diameter of the CT, the relay type, the relay setting and the primary operating current need to be furnished.
Interposing CTa s (ICTa s): Interposing CTa s are used when the ratio of transformation is very high. It is also used to correct for phase displacement for differential protection of transformers.


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