Second Harmonic Restraint Equation
Second Harmonic Restraint Equation
(OP)
Sir,
For calculating percentage second harmonic restraint of a transformer differential relay the following equation is used:
%HR = 47.1Idc / (Iac+1.11Idc)
Can anybody give me complete derivation of this equation?
For calculating percentage second harmonic restraint of a transformer differential relay the following equation is used:
%HR = 47.1Idc / (Iac+1.11Idc)
Can anybody give me complete derivation of this equation?






RE: Second Harmonic Restraint Equation
http://pm.geindustrial.com/FAQ/Documents/T60/GER-3989.pdf
and references therein for more info on the derivation.