Related Question
Equation of operating time for IDMT relay (t) = 0.14*TMS/[(PSM^0.02) - 1]
Here,
PSM = TMS = 1
So,
t = 0.14*1/(1 - 1)
t = infinite
Maximum permissible load = Rated MVA rating*fraction of rated kVA
Maximum permissible load = 15*1.25
Maximum permissible load = 18.75 MVA