Toshiba GR-200-5 Instruction Manual

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6F2T0207 (0.01)GRE200 (5,6)- 604 -4.5.3 Line-outage check(i) Voltage conditionsIn the SYNCHK function the OVr, OVi, UVr, and UVi elements are used to verify the line-condition. For example, when the user wishes to connect an incoming-line (i.e., transmissionline) with the running-line (i.e., a busbar), the voltage conditions on either lines may beexamined prior to connection. Alternatively, the absence of voltage on both lines may berequired before connection. In order to provide this functionality, the SYNCHK function hasfour check zones to test for the line being either in-service or out-of-service; the four zones areillustrated in Figure 4.5-7.DRDI LRDILRLIDRLISetting [UVI1]Setting [OVI1]Setting [UVR1]Vi on the incoming lineVr on the running lineSetting [OVR1]Figure 4.5-7 Four voltage conditions examined in SYNCHK_Ry1For example, “DRLI” zone covers the case when the running-line is out-of-service (DR)and the incoming-line is in-service (LI). Table 4.5-3 exemplifies the areas in accordance withthe voltage conditions.Table 4.5-3 Four voltage conditions and zonesVoltage condition 1 2 3 4Area D○R L○I L○R L○I D○R D○I L○R D○I○R unning line (Vr) (Dead) (Live) (Dead) (Live)○I ncoming line (Vi) (Live) (Live) (Dead) (Dead)Figure 4.5-8 and Figure 4.5-9 show the voltage-presence (or voltage-absence) check logicused in the SYNCHK_Ry1 and Ry2 functions.