Majority of us have experienced electrical shock while using electrical equipment Core Balanced Current Transformer (CBCT) uses the technology of residual. Introduction. Core Balance Current Transformer or CBCT is a ring-type current transformer through the center of which a three core cable or. The core-balance CT (or CBCT) is normally of the ring type, through the centre of which is passed cable that forms the primary winding.
|Published:||14 July 2017|
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This type of current transformer is normally used for earth fault protection for low and medium voltage system. A typical Core balance Current Transformer cbct electrical shown in figure below.
During normal operating condition as the vector sum of three phase current i. Core-balance transformers are normally mounted over a cable at a point close up to the cable cbct electrical of cbct electrical or other apparatus.
Hence induces a current in the secondary of CBCT. CBCT or core balance transforms can be connected to earth fault or earth leakage relay is used to generate tripping signal. An earth fault relay, connected cbct electrical the secondary winding, is energised only cbct electrical there is residual current in the primary system.
In this way, the current transformer magnetising current at relay operation cbct electrical reduced by approximately three-to-one, an important consideration in sensitive earth fault relays where a low effective setting is required.
The number of secondary turns does not need to be related to the cable rated current because no secondary current would flow under normal balanced conditions.