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Definition of Nonhomogenous System for Distance Relaying Elements

Definition of Nonhomogenous System for Distance Relaying Elements

Definition of Nonhomogenous System for Distance Relaying Elements

(OP)
It is my understanding that a nonhomogenous system (unequal source and line impedance angles) will adversely affect a quadrilateral characteristic as used in ground distance relaying, causing it to over or under reach.  
   A nonhomogenous system is defined as one having differing line and source impedence angles.  My question: exactly what does this defintion mean?  Does it mean the comparison between the angle of the thevanin impedance looking back from one bus to the impedance angle of a line that  the bus serves?  That would mean that a system can be both homogenous and nonhomogenous on a bus by bus basis.  Or, is it a system-wide definition?  If so, how is it determined on a system-wide basis?

Thanks in advance for any help you can give me.  I'm new to relaying.

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