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Answer Posted / abhishek singh
Core balance CT (CBCT): The CBCT, 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.
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