EPNES Tutorial on Power Dist Systems GTH
13 Pages
English
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EPNES Tutorial on Power Dist Systems GTH

Downloading requires you to have access to the YouScribe library
Learn all about the services we offer
13 Pages
English

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Power Engineering concepts for Industrial Engineerseconcepor alTutorial onPower Distribution CircuitsG. HeydtArizona State UniversityMarch, 2003Arizona State UniversityArizona State University1Power Engineering concepts for Industrial Engineerseconcepor alWhat is power distribution?Power systems are made up of:!Generation!Transmission!DistributionGeneration systems are the large generating units that produce AC voltages at high power levels.Transmission systems are long distance, very high power level systems to transmit power from city to city.Distribution systems are local, lower power systems that take power from the intercity grid and bring this to residences, commercial customers, and industrials.Arizona State UniversityArizona State University2Power Engineering concepts for Industrial Engineerseconcepor alTypical numbersTransmis- Generation Distributionsion Typical 35 kV 345 kV 15 kV voltages Typical 800 MW 800 MW 1 MW power Local in In a power Inter-city, Typical size neighbor-plant 200 km hood, 5 km Arizona State UniversityArizona State University3Power Engineering concepts for Industrial Engineerseconcepor alTypical configurationsTransmission systems are NETWORKED usually. That is there are many loads and many sources, and many lines that join these points in a mesh, networked fashion.PRESCOTTWINSLOWFLAGSTAFFTEMPEPHOENIXHOLBROOKNOGALESArizona State UniversityArizona State University4Power Engineering ...

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Power Engineering concepts for Industrial Engineers
Tutorial on Power Distribution Circuits
G. Heydt
Arizona State University
March, 2003
Arizona State University
1
Power Engineering concepts for Industrial Engineers
What is power distribution?
Power systems are made up of:
! Generation ! Transmission ! Distribution
Generation systems are the large generating units that produce AC voltages at high power levels.
Transmission systems are long distance, very high power level systems to transmit power from city to city.
Distribution systems are local, lower power systems that take power from the intercity grid and bring this to residences, commercial customers, and industrials.
Arizona State University
2
Power Engineering concepts for Industrial Engineers
 Typical voltages Typical power
Typical size  
Typical numbers
Generation 35 kV
35 kV
800 MW
In a power plant
Transmis-sion 345 kV
345 kV
800 MW
Inter-city, 200 km
Distribution 15 kV
15 kV
1 MW
Local in neighbor-hood, 5 km
Arizona State University
3
Power Engineering concepts for Industrial Engineers
Typical configurations
Transmission systems are NETWORKED usually. That is there are many loads and many sources, and many lines that join these points in a mesh, networked fashion.
FLAGSTAFF
PHOENIX
NOGALES
PRESCOTT
WINSLOW
TEMPE
HOLBROOK
Arizona State University
4
Power Engineering concepts for Industrial Engineers
Typical configurations
Transmission systems are networked so that power can be delivered between load centers by several routes. If a line is removed from service, power can be rerouted. Like power delivered to Nogales from Flagstaff by two different routes.
FLAGSTAFF
PHOENIX
NOGALES
PRESCOTT
WINSLOW
TEMPE
HOLBROOK
Arizona State University
5
Power Engineering concepts for Industrial Engineers
Distribution systems
Distribution system configuration is usually different --rather than being networked, distribution systems are usually RADIAL. That means lines go from A to B to C to D to ...
RURAL RD PRICE RD
MESA-W
MESA-C
MAIN ST
Arizona State University
6
Power Engineering concepts for Industrial Engineers
Distribution systems
Power can only flow in one direction in the radial system
RURAL RD
PRICE RD
MESA-W
MESA-C
MAIN ST
Arizona State University
7
Power Engineering concepts for Industrial Engineers
Distribution systems
Why is this configuration used?
! Safety (only one source direction - when it is interrupted, the line is dead) ! Cost -- it is cheaper ! Easy to locate problems
RURAL RD PRICE RD
MESA-W
MESA-C
MAIN ST
Arizona State University
8
Power Engineering concepts for Industrial Engineers
Networked Systems
But there are advantages of reliability of networked systems - provided cost, safety, control, and maintenance issues can be resolved.
Arizona State University
9
Power Engineering concepts for Industrial Engineers
A TYPICAL RADIAL DISTRIBUTION SYSTEM
Arizona State University
10
Power Engineering concepts for Industrial Engineers
Research and study areas
! The reliability vs. cost of networked systems versus radial systems ! Use of networked systems (they do this in big cities like Chicago and New York) ! Control of power in a networked distribution system
TOTAL COST
INVESTMENT COST
COST OF SERVICE INTERRUPTIONS AND LOSS OF PRODUCTIVITY
Deployment of distribution components, multiple feeds, and over-capacity
Arizona State University
11