SASKPOWER OPEN ACCESS TRANSMISSION TARIFF

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SASKPOWER OPEN ACCESS TRANSMISSION TARIFFtransfers. This interdependence is due to SaskPower internal system limitations.Saskatchewan - Manitoba Interfaces (MAPP)The Manitoba 230 kV interface consists of the three 230 kV transmission lines,designated P52E, R25Y, and R7B, which interconnect at the SaskPower stations ofE.B. Campbell, Yorkton, and Boundary Dam and the MHEB (Manitoba HydroElectricBoard) stations of Rall's Island, Roblin and Reston, respectively. This interface isconstrained by restrictions within Manitoba and SaskPower. The interface restrictions arenot typically circuit overloads, but are generally the result of low voltage or equipmentoverload conditions in the SaskPower system due to the loss of generation or parallelcircuits. The P52E and R7B transmission lines represent individual constrained paths thatare limited by the thermal capability (sag limit) of the lines.A second Manitoba interface consists of the two 110 kV lines from the Island Fallsstation in Saskatchewan to the Cliff Lake station in Manitoba. Currently, this interface isnot a constrained path. The energy delivered from Island Falls into the Manitoba 115 kVinterface is returned to SaskPower on the Manitoba 230 kV interface. This impact isaccounted for in the participation factors and is considered an “Existing TransmissionCommitment” for both interfaces.Saskatchewan - North Dakota Interface (MAPP)The North Dakota interface consists of the phase shifting transformer BD922T atSaskPower’s Boundary Dam station and the 230 kV line (B10T) between Boundary Damand the Tioga station in North Dakota. This interface is constrained by the transfercapability of the BD922T phase shifting transformer and by restrictions in the U.S., aswell as by SaskPower system restrictions. The SaskPower restrictions are generally theresult of low voltage or equipment overload conditions in the SaskPower system due tothe loss of generation or parallel circuits.Page | 115
SASKPOWER OPEN ACCESS TRANSMISSION TARIFFSaskatchewan - Alberta Interface (WSCC)The Alberta interface consists of the 230 kV transmission line from Swift Current to theMcNeill Converter Station, located in Alberta. This interface links the two asynchronousEastern and Western Interconnections. This interface is constrained by the transfercapability of the McNeill back-to-back Converter Station and other restrictions in theAlberta and SaskPower systems. The SaskPower restrictions are generally the result oflow voltage conditions in the SaskPower system due to the loss of generation or parallelcircuits.SaskPower Transmission System LimitationsDue to the inherent characteristics of the existing SaskPower transmission system; relatively longtransmission lines, sparsely distributed load with low load factor, weak interconnections withNorth Dakota and Alberta and distributed generation resources, the transmission system loadingand associated available transfer capability can vary significantly over a wide range of operatingconditions. These limitations are usually due to high real and reactive power transmission lossesthat are exacerbated by contingencies, resulting in the potential for voltage instability andequipment overloads, especially in conjunction with transfers across the interfaces. Tocompensate for this limitation, the Coteau Creek Initiated Loadshed Scheme (CCILS) wasincorporated. This scheme initiates three stages of load tripping when a contingency causes thereactive power loading at the Coteau Creek generating station to reach a predefined level. Sincecapacity factors for transfers across the interfaces were originally planned to be low, the risk ofinterrupting load was considered to be acceptable.Page | 116
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SASKPOWER OPEN ACCESS TRANSMISSION TARIFF

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