Investigation into a double-circuit line fault using the mutual coupling impedance

The parameterization of a distance relay requires precise knowledge of the positive-sequence impedance Z1 and zero-sequence impedance Z0 of the line being protected. If, in addition to this, the circuits are parallel (or partially parallel) to one another, the coupling impedance of the zero sequence Z0M must also be considered.

This paper demonstrates that by measuring Z1, Z0, and Z0M and carrying out a simulation in RelaySimTest, the currents and voltages associated with a fault can be simulated extremely accurately. The currents and voltages of a real fault are applied to the relay, which then responds in a correspondingly realistic manner.

OMICRON provides a comprehensive solution with access to a range of test sets and software to facilitate the simple, practical, and system-based testing of the distance protection relays of double-circuit lines.

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