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Second Harmonic Restraint Equation

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appunni

appunni

Electrical
Joined
Feb 11, 2003
Messages
52
Location
IN
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?
 
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