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L#9 Per Unit Calculations for Transmission Line

# L#9 Per Unit Calculations for Transmission Line - Per Unit...

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Per Unit Calculations for Transmission Line Masoud Fathizadeh, PhD, PE Department of Engineering Technology Purdue Calumet Hammond, Indiana 46323

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2 Procedure for Per Unit Analysis 1. Pick for the system. 2. Pick according to line-to-line voltage. 3. Calculate for different zones. 4. Express all quantities in p.u. 5. Draw impedance diagram and solve for p.u. quantities. 6. Convert back to actual quantities if needed. Base S Base V Base Z
3 How to Choose Base Values ? Divide circuit into zones by transformers. Specify two base values out of ; for example, and Specify voltage base in the ratio of zone line to line voltage. Source Zone 1 Zone 2 Zone 3 Zone 4 Base S 1 Base V 2 Base V 3 Base V 4 Base V Base V B B B B S Z V I , , , 1 1 Base Base Base V S I 1 1 1 Base Base Base I V Z 2 1 : V V 3 2 : V V 4 3 : V V

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4 Example 1 Given a one line diagram, Find , , , , and . g I load V load P ~ 5 MVA 13.2 Δ 132 Y kV 10 MVA 138 Y - 69 Δ kV 100 10 line j Z g I p.u. 1 . 0
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