analog inputs are currents and next three are voltages in the observed bay (no parallel lineexpected since chosen input is set to zero). Use the Parameter Setting tool within PCM600 forchanging analog configuration.The measured phase voltages can be fine tuned with the parametersUL1Gain,UL2Gain andUL3Gain to further increase the accuracy of the fault locator.The list of parameters explains the meaning of the abbreviations. Figure 147 also presentsthese system parameters graphically. Note, that all impedance values relate to their primaryvalues and to the total length of the protected line.Z0m=Z0m+jX0mR1A+jX1AR0L+jX0LR1L+jX1LR0L+jX0LR1L+jX1LR1B+jX1BDRPRDRELMBRFLOANSI05000045_2_en.vsdANSI05000045 V2 EN-USFigure 147: Simplified network configuration with network data, required for settings ofthe fault location-measuring functionFor a single-circuit line (no parallel line), the figures for mutual zero-sequence impedance (X0M,R0M) and analog input are set at zero.Power system specific parameter settings are not general settings but specific settingincluded in the setting groups, that is, this makes it possible to change conditions for theFault locator with short notice by changing setting group.The source impedance is not constant in the network. However, this has a minor influence onthe accuracy of the distance-to-fault calculation, because only the phase angle of thedistribution factor has an influence on the accuracy. The phase angle of the distribution factoris 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 tovalues other than zero. If the actual values are not known, the values that correspond to thesource impedance characteristic angle of 85° give satisfactory results.15.8.3.1 Connection of analog currents M13769-16 v5Connection diagram for analog currents included IN from parallel line shown in figure 148.1MRK 505 363-UEN A Section 15Monitoring305Application manual
