Chapter02 010809

Chapter02 010809 - BEE3133 ELECTRICALPOWER SYSTEMS Chapter2...

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BEE3133  ELECTRICAL POWER  SYSTEMS Chapter 2 The Per-Unit System Rahmatul Hidayah Salimin
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Learning Outcomes Students should be able to Identify the symbols and draw the one-line  diagram Construct the impedance diagram and find  the per unit values. Solve the per unit problems of a single-phase  and three-phase circuit. Identify the advantages of per unit system.
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Power System Representation :  One Line Diagram Represent or portray the interconnection of the power system  components – used extensively in power flow studies Also referred as Single-line Diagram In a one line diagram, lines on paper (or on a computer screen)  represent wires. Advantage: Simplicity Rather than drawing all three wires in a three-phase system,  it is normal to simplify things by representing all three  phases with one line – thus the name one line diagram Equivalent circuit  of the components are replaced by their  standard symbols The completion of the circuit through the neutral is omitted.  
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One Line Diagram - Symbols two-winding  transformer current transformer two-winding  transformer generator bus voltage transformer capacitor circuit breaker transmission line delta connection wye connection  circuit breaker fuse surge arrestor static load disconnect Symbols used in one line diagram (from ANSI and IEEE)
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Exercise Draw a one line diagram for a simple  power system which composes of the  following equipments :    Generator (1 unit), transformer,  transmission line, transformer and load
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L7 L6 L2 L1 L3 1 2 3 5 4 L5 L4 generator transformer bus coding circuit breaker bus load line coding tie line connection  with neighboring  system transmission line
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One-line diagram - symbols The main component of a one-line (or  single line) diagram are : Buses,  Branches, Loads, Machines, 2 winding  Transformers, Switched Shunts,  Reactor and Capacitor Banks.
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One-line diagram - explanation Buses  are represented as a dot, circle or a thick line. The bus name  (EAST500) and number (202) are given,  as well as the voltage measured on the line (510.5kV and  1.021V in per unit). Final characteristic given is the angle(-26.1 degree). The voltage is indicated by the color of the bus. Red  indicates 500kV
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One-line diagram - explanation Branches  are represented as a thin line. The real power P, as shown on the branch below, flows  from 478MW to -473MW and the reactive power Q, flows  from 89.9MVA flow to -229.4MVA. The power flows from positive number to the negative 
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This note was uploaded on 09/20/2010 for the course ECE 18418 taught by Professor Illic during the Fall '09 term at Carnegie Mellon.

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Chapter02 010809 - BEE3133 ELECTRICALPOWER SYSTEMS Chapter2...

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