Skip to Main Content
The paper provides a detailed evaluation of the errors arising in the measurement of impedance by distance protection, when applied to 400kV double-circuit lines formed in the widely used looped interconnection. An accurate separation of the errors arising from primary-circuit interphase and intercircuit mutual coupling, nontransposition of phase conductors, and fault resistance, is developed; and the fault and prefault operating conditions for which the errors have their greatest individual and combined effects are formulated. Extensive computer evaluations of errors under single-phase-to-earth fault conditions are tabulated, on the basis of which their consequences in relation to the fault operating performance of distance protection are assessed.
Electrical Engineers, Proceedings of the Institution of (Volume:117 , Issue: 2 )
Date of Publication: February 1970