Emergency Manual Load Shedding and Peak Load Reduction ...

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4.0 PEAK LOAD REDUCTIONOO 6T-29Effective Date: 02 July 2014Page 4 of 13Refer to OO 6T-25 OPERATION PLAN FOR CAPACITY AND ENERGY EMERGENCIES for moredetails.During the onset of an Energy Emergency, Peak Load Reduction can help avoiding widespreademergency load shedding. A requirement for peak load reduction will generally occur with severalhours warning. PSOSE and FortisBC shall, as necessary, initiate Transmission Voltage CustomerEmergency Load Curtailments to reduce the system load.Also note that load shaving by voltage reduction may also be used in the distribution system, ifavailable. This procedure requires activation in the field and, therefore, is more suitable for longerterm load reduction.5.0 OPENING OF INTERTIESExternal Balancing Areas that are seriously under generating can pose a threat to the BC Hydrosystem. Interties need to be tripped if the BC Hydro system is exporting, the frequency isbelow 57.9 Hertz 1 and is continuing to decline despite efforts to arrest the decay.In such situation, the Transmission Coordinator will direct the appropriate Grid Operators to off-loadany intertie with the US, Alberta, FortisBC or Alcan where the flow of power is out of the BC Hydrosystem.1 57.9 Hz as per “WECC Coordinated Off-Nominal Frequency Load Shedding and RestorationRequirements”6.0 VOLTAGE CONTROL DURING EMERGENCIESVoltage levels must be closely monitored while load is being shed. All reactive resources should beutilized to control voltage. Circuits should be switched out of service as necessary to control if there isan overvoltage condition when the load is dropped. (See OO 7T-22 for Voltage Tolerances) Inaddition to 500 kV lines, the TC will consider cutting out 230 kV cable circuits to reduce VARs.Lower Mainland cables contribute charging VARs as follows:CCTCCT U/GLength(km)CCT O/HLength(km)Total CCTLength (km)% ofCCTU/G% ofCCTO/HCCT CableMVAR(3 ph at242kV)230kV CCTs2L31 1.1 0.0 1.1 100% 0% 9.22L32 8.6 0.0 8.6 100% 0% 67.32L33 8.7 0.0 8.7 100% 0% 78.02L39 3.3 21.0 24.3 14% 86% 26.72L40 3.3 12.4 15.8 21% 79% 27.02L45 6.1 0.0 6.1 100% 0% 36.42L50 7.4 24.2 31.6 23% 77% 44.82L51(COK-BND) 9.2 0.0 9.2 100% 0% 74.42L51(HPN-BND) 7.7 0.0 7.7 100% 0% 62.82L53 7.3 0.0 7.3 100% 0% 46.92L55 11.3 0.0 11.3 100% 0% 71.62L56 2.2 32.3 34.5 6% 94% 13.52L62 0.8 12.6 13.4 6% 94% 4.72L64 7.1 8.1 15.2 47% 53% 46.3
OO 6T-29Effective Date: 02 July 2014Page 5 of 137.0 RESTORATION OF SERVICEThe GO and LO shall obtain permission from the TC prior to restoring load that was shed manually orautomatically. When the BC Hydro system is tied to BPA, the TC shall notify and consult with the PeakReliability (PeakRC) Reliability Coordinator (RC) prior to restoring loads shed by under frequencyrelays, unless there is an automatic load restoration scheme in place.Restoration of TVC load affected by Peak Load Reduction is the responsibility of PSOSE andFortisBC, in consultation with BC Hydro RTO.8.0 REVISION HISTORY (This order is also posted on BC Hydro’s External website)Revised By Revision Date Summary of RevisionTMN 4 September 2009 New Operating Order combining 6T-29A, 6T-29B, 6T-29C,6T-29D and 6T-29E.DSM 17 September 2009 Revised LM, NI and SI appendices.CAP 09 September 2010 BCTC changed to BC Hydro.DSM 01 October 2010 Appendix 3 – EMLS Block 3 - updated.MPP 21 September 2011 Annual Review Performed.MPP/MH 09 December 2011 Updated for CYP T3. Additional updates in Appendix 1 and2 (EFM shutdown).MPP/LR/HQ 13 December 2011 Updated Lower Mainland Block 3, Southern Interior Block 3,remove EFM from Vancouver Island Blocks and minorupdates.MPP 05 September 2012 Annual Review Performed.MPP 19 July 2013 Annual Review Performed.MPP 10 June 2014 Annual Review Performed.MPP 03 July 2014 Updates to Appendix 1, Section 2.0; Appendix 3, Section3.0; Section 1.0; Appendix 4, Section 1.0
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