Example-3: Approximate method for calculations of T/F relay settings


Example-3: For the power system shown below calculate overcurrent and earth fault relay settings in respect of both transformer HV and LV side relays using approximate or quick method.
Transformers are operating in parallel. LV side relay has Directional as well as Non-Directional element.




As recommended in topic explaining approximate method for calculations of relay settings; readers are requested to go through calculations steps preferably by hand calculations.












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