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# Calculate the size the CT on the neutral point of the secondary side of 11/0.415 kV Transformer

For high impedance relays (differential or restricted earth fault relays), ‘Class X’ current transformers are recommended to be used.

Please note that both CTs (neutral & phase) shall have the same characteristics. The following is an example to size the CT:

Input data: 11/0.415 kV ,2500 KVA Power transformer ,Transformer impedance is 6% ,Length of cable from neutral CT to the relay is 200 m ,Cross section of CT cable to be used is 6 mm² -copper and resistance is 0.0032 Ω/m

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