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.
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.