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Calculation Of fault Current
1-Find Full load current
2-Transformer Multiplier from Z on nameplate or calcuate from rated current and Isc
3-Calculate f (fault) factor
4-Calculate Multiplier M=1/(1+f)
5- Isc (rms)= Isc* M
Relay Coordination
1-Find maximum load current
2-Select CT ratio as per relay pick up.
3-Calculate Short circuit ratio
4- Calculate time settings & plug settings of relay
5-If used as secondary protection or out of zone than add primary zone time in calculation
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