Emergency Manual Load Shedding and Peak Load Reduction ...

Appendix 2OO 6T-29Effective Date: 02 July 2014Page 8 of 13EMLS – Vancouver Island Area1.0 EMERGENCY MANUAL SHEDDING BLOCKSManual load shedding may require up to 50% of the area load to be shed in 3 blocks within 5 minutes.The shedding described in the table in Section 2 is in order of priority within each block.If under frequency load shedding has occurred, some of the following loads may have already beenshed.Voltages should be monitored frequently while load is being shed. At the direction of the TC, circuitsshould be cut out as necessary to control the voltage.At the pulp mills, the thermal mechanical pulping (TMP) load is shed. PAL is 30 MW and CFT is 20MW in block “A”. PAL “B” is the 25 kV residential load.Once load shedding complete, switching should commence to restore station service to affectedstations.EMLSBlockLoad or StationApproximateTotal MaximumBlock MW1 GTP-A PAL-A CFT-A 120 MW2 GTP-B PVO NFD HSY-A CLD-A 292 MW3 PAL-B HSY-B HSY-C ESQ-A 304MWTOTAL716 MW2.0 EMERGENCY MANUAL LOAD SHEDDING PROCEDUREThe manual load shedding should be performed from the VI Manual Load Shedding screen asshown in Appendix 5 (Figure 2). It is based on the same load shed matrix used by the VI AutomaticUnder-Voltage Load Shedding scheme. The VI total actual real time load is displayed on this screen atthe bottom. The VI load change (shed) can be calculated by comparing the VI load display readingbefore and after the load shedding.The load shedding screen has 12 non-EMLS blocks and 3 EMLS blocks. The automatic (AUVLS)scheme sheds loads displayed in the non-EMLS blocks 1 to 8. Non-EMLS blocks 9 to 12 are used bythe VI Grid Operator to shed load for local system requirements. The blocks are identified by theyellow color border. Each block can be tripped by a single push button that would send trip signal toappropriate breakers at the load locations.