Transcription of SECTION 9: ELECTRICAL POWER DISTRIBUTION
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SECTION 9: ELECTRICAL POWER DISTRIBUTION
ESE 470 Energy DISTRIBUTION SystemsSECTION 9: ELECTRICAL POWER DISTRIBUTIONK. WebbESE 470 Introduction2K. WebbESE 4703 The ELECTRICAL Grid Three main components to the ELECTRICAL grid Generation ESE 450 Transmission Transmission Subtransmission DISTRIBUTION Primary DISTRIBUTION Secondary DISTRIBUTION Different voltage levels at each Connected by transformersK. WebbESE 4704 Transmission Network Provides bulk powerfrom generators to the grid Interconnection point between separate utilities or separate generators POWER bought and sold at this level High voltage for low loss, long-distance transmission kV Generator step up transformers at POWER plant High POWER MVAper three-phase circuit Transmission network terminates at bulk-poweror transmission substationsK. WebbESE 4705 Subtransmission Network Voltage stepped down at bulk- POWER substations Typically 69 kV, but also 115 kVand 138 kV Large industrial customers may connect directly to the subtransmission network Voltage stepped down at customer s substation Subtransmission network terminates at DISTRIBUTION substationsK.
Provides bulk power from generators to the grid Interconnection point between separate utilities or separate generators Power bought and sold at this level High voltage for low loss, long-distance transmission 230…765 kV Generator step up transformers at power plant High power 400…4000 MVAper three-phase circuit
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