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Magic Valley Electrical Plan Substations Presentation - Idaho Power

Magic Valley Electrical Plan Substations Presentation - Idaho Power

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<strong>Magic</strong> <strong>Valley</strong> <strong>Electrical</strong> <strong>Plan</strong>Community Advisory Committee-<strong>Substations</strong>-Meeting #2January 17, 2008


<strong>Substations</strong>• A substation is used to transform one voltage to anotherand for protecting and controlling transmission anddistribution lines• What’s inside a substation?– Support structures to terminate transmission lines– Large metallic pipe called bus work– Circuit breakers– Switches– Transformers2MVEP <strong>Substations</strong> Jan08.ppt


<strong>Substations</strong>• Think of a substation as being an onramp or offrampfrom an interstate or an intersectionconnecting an arterial to a collector road• In general, power flows from power plantsubstations to main grid substations then from maingrid substations to distribution substations3MVEP <strong>Substations</strong> Jan08.ppt


<strong>Substations</strong>• As an analogy, electricity flows through substations inthe same way a car might travel across the state– first the car enters the interstate (main grid) by way of an onramp(power plant substation)– then moves down the interstate, leaving the interstate at an offramp(main grid substation) onto a minor highway (lowervoltage transmission line)– The car moves down the highway, finally turning off thehighway at an intersection (distribution substation)4MVEP <strong>Substations</strong> Jan08.ppt


5MVEP <strong>Substations</strong> Jan08.ppt


Substation Types• <strong>Power</strong> <strong>Plan</strong>t Substation – Acts as the receiving point forenergy produced at generation– Generators produce electricity at lower voltage• Typically 6,500 to 13,800 Volts– <strong>Power</strong> <strong>Plan</strong>t Substation steps voltage up to transmission voltage• Range from 69,000 to 345,000 Volts– Can be co-located with other types of substations– Send out power to Main Grid <strong>Substations</strong>6MVEP <strong>Substations</strong> Jan08.ppt


Oxbow <strong>Power</strong> <strong>Plan</strong>t Substation69 kV, 138 kV, 230 kV7MVEP <strong>Substations</strong> Jan08.ppt


Substation Types• Main Grid Substation – Convert 230,000/345,000/500,000 Volttransmission to 46,000/69,000/138,000 Volts for transmission toDistribution <strong>Substations</strong>– Typically has multiple voltages present– Can be co-located with other types of substations– Send out power to Distribution <strong>Substations</strong>– Midpoint Substation acts as the main grid substation servingthe <strong>Magic</strong> <strong>Valley</strong>8MVEP <strong>Substations</strong> Jan08.ppt


Midpoint Substation500kV, 345kV, 230kV, 138kVHighway 759MVEP <strong>Substations</strong> Jan08.ppt


Substation Types• Distribution Substation – Converts the 46,000/69,000/138,000Volt transmission from Main Grid Substation to 12,470/34,500Volts for delivery to its end use10MVEP <strong>Substations</strong> Jan08.ppt


Filer Substation46 kV to 12.47 kV transformation11MVEP <strong>Substations</strong> Jan08.ppt


12MVEP <strong>Substations</strong> Jan08.ppt


Final Questions / Next Steps• Advisory Committee mtg #3– <strong>Magic</strong> <strong>Valley</strong> Existing Conditions– Demand Side Management– Rates and Regulatory• Advisory Committee Meeting #4– <strong>Plan</strong>ning Process Review and Orientation– The Range of Possible Alternatives (including siting criteria)– Develop Goals13MVEP <strong>Substations</strong> Jan08.ppt

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