Frame Leakage Protection of Transformer:

Frame Leakage Protection of Transformer – The transformer is mounted insulated from the ground, as illustrated in Fig. 12.14. The transformer tank is connected to earth through a CT to which an instantaneous earth fault relay is connected.

In the case of an earth fault in the transformer (breakdown of insulation in any winding of the transformer), there is a flow of current to the earth over this connection causing the relay to operate.

Frame Leakage Protection of Transformer

Such an arrangement is usually provided where banked transformers are provided with a single overall differential protection and it is difficult to find as to which transformer is faulty.

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