How to solve my Error "Conversion to logical from sym is not possible" in my program" for Differential Relay equation

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Hi Guys, I have a problem with this Error "Conversion to logical from sym is not possible" in my program" for Differential Relay equation.I want to find out about these coefficients "IS1 K1 IS2 K2" Thanks
syms IS1 K1 IS2 K2 Idiff Ibias ;
Idiff=3 ;
Ibias=1.5 ;
if Ibias < IS2
Idiff > (K1*Ibias+IS1) %then trip
elseif Ibias >= IS2
Idiff >= (K2*Ibias)-(K2-K1)*IS2 +IS1 %then trip
end
%IS1: The basic differential current setting
%K1: The lower percentage bias setting
%IS2: The bias current threshold setting
%K2: The higher percentage bias setting
  3 commentaires
madhan ravi
madhan ravi le 23 Août 2018
You cannot pass a logical statement to a symbolic variable.
m gh
m gh le 24 Août 2018
for example IS1=1 ; ISD=2 now how to find a range for K1 and K2?

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