Step1 Press the enter and go to setting 2 Step2 Enter password 0000 Step3 Change the CT & PT primary and secondary ratio. After that press the enter and press exit button.
There is no zero sequence current in delta winding line of transformer.so for protect star delta three phase Transformers from external fault zero sequence current compansation must we used in differential protection scheme (87T).
This block diagram represent how the current and voltage signal flow in numerical relay used in power system protection.
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