Mutual Coupling Compensation Techniques Used for Distance Protection of Parallel Lines

Michael O Donovan, Noel Barry, Joe Connell and Eoin Cowhey
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Michael O Donovan: Department of Electrical and Electronic, Munster Technological University, Bishopstown, T12 P928 Cork, Ireland
Noel Barry: Department of Electrical and Electronic, Munster Technological University, Bishopstown, T12 P928 Cork, Ireland
Joe Connell: Department of Electrical and Electronic, Munster Technological University, Bishopstown, T12 P928 Cork, Ireland
Eoin Cowhey: Electricity Supply Board, Rosbrien Rd, V94 A5D2 Limerick, Ireland

Energies, 2021, vol. 14, issue 7, 1-15

Abstract: When a distance relay protects a transmission line located on a dual circuit tower, a coupling effect will occur between the two circuits. Transposition of the circuits can reduce the mutual impedances, but this does not cater to the zero-sequence mutual coupling impedance during earth faults. As a result, the impedance measured by a distance relay under phase-to-earth fault conditions in these circumstances will not represent the correct impedance to the fault point unless these effects are taken into account. On multi-circuit lines, primarily if they operate in parallel, a zero-sequence mutual coupling should be considered when calculating settings for distance protection function. A 220 kV parallel line sharing the same tower was analysed using DigSilent Power Factory in the simulations. Phase-to-earth faults in different configurations were analysed on this system, and the reach of the protection relay was then estimated for operation. The results confirm how a protection relay can overreach and underreach in a distance protection scheme due to the influence of mutual coupling.

Keywords: mutual coupling; earth fault; distance protection; mutual compensation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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