The difference compared to the distance zone measuring function is in thecombination of measuring quantities (currents and voltages) for different types offaults.The current start condition STCNDLE is based on the following criteria:1. Residual current criteria2. Load encroachment characteristicThe STCNDLE output is non-directional.7.3.6.1 Load encroachmentEach of the three measuring loops has its own load encroachment characteristic basedon the corresponding loop impedance. The load encroachment functionality is alwaysactive but can be switched off by selecting a high setting.The outline of the characteristic is presented in figure 60. As illustrated, the resistiveblinders and the angle of the sectors are the same in all four quadrants.RXRLdArgLdArgLdArgLdArgLdIEC10000144-1-en.vsdRLdIEC10000144 V2 ENFigure 60: Characteristic of load encroachment functionThe reach is limited by the minimum operation current and the distance measuringzones.1MRK 504 135-UEN A Section 7Impedance protection139Technical manual
