Toshiba GR200 Series Instruction Manual page 117

Line differential protection ied

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impedance and negative-sequence impedance are the same and that the influences of the fault

resistance are ignored.

Relay point positive-sequence voltage

Relay point negative-sequence voltage

Relay point zero-sequence voltage

Fault point positive-sequence voltage

Fault point negative-sequence voltage

Fault point zero-sequence voltage

Relay point positive-sequence current

Relay point negative-sequence current

Relay point zero-sequence current

Adjacent line zero-sequence current

Fault point - relay point positive-sequence impedance

Fault point - relay point zero-sequence impedance

Adjacent line zero-sequence mutual impedance

Considering the faulted phase voltage V a F at the point of fault is,

Phase-A voltage V a at the relay is calculated from the following equation:

Where, I a is the current of phase-A at the relay and is defined in the following equation

by the symmetrical component of the current:

Here, defining the current synthesized using the phase-A current at the relay as I a ', and

Then equation (2.10-11) can be re-written in the following form:

6F2S1914 (0.49)

GRL200 (Soft 033 & 037)

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