Z0m=Z0m+jX0mR1A+jX1AR0L+jX0LR1L+jX1LR0L+jX0LR1L+jX1LR1B+jX1BDRPRDRELMBRFLOANSI05000045_2_en.vsdANSI05000045 V2 EN-USFigure 396: Simplified network configuration with network data, required forsettings of the fault location-measuring functionFor a single-circuit line (no parallel line), the figures for mutual zero-sequenceimpedance (X0M, R0M) and analog input are set at zero.Power system specific parameter settings are not general settings but specificsetting included in the setting groups, that is, this makes it possible to changeconditions for the Fault locator with short notice by changing setting group.The source impedance is not constant in the network. However, this has a minorinfluence on the accuracy of the distance-to-fault calculation, because only thephase angle of the distribution factor has an influence on the accuracy. The phaseangle of the distribution factor is normally very low and practically constant,because the positive sequence line impedance, which has an angle close to 90°,dominates it. Always set the source impedance resistance to values other than zero.If the actual values are not known, the values that correspond to the sourceimpedance characteristic angle of 85° give satisfactory results.18.8.3.1 Connection of analog currents M13769-16 v5Connection diagram for analog currents included IN from parallel line shown infigure 397.Section 18 1MRK 506 369-UEN BMonitoring794 Line distance protection REL670 2.2 IECApplication manual
