Example 3.4

Example 3.4 - Example 3.4 - Per Unit Calculations:...

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Example 3.4 - Per Unit Calculations: Feb-06-2008, by M. Giesselmann Three zones of a single-phase circuit are connected by Transformers T1 and T2. Using base values of 30 kVA and 240 volts in zone 1, draw the per-unit circuit and determine the per-unit impedances and the per-unit source voltage. Then calculate the load current both in per-unit and in amperes. Transformer winding resistances and shunt admittance branches (magnetizing current) are neglected. kVA kW If a transformer nameplate rating differs from the global system base values, the per-unit impedances must be converted according to the Equations below: Z pu.new Z Z Base.new = Z pu.old Z Base.old Z Base.new = using: Z Base V Base 2 S Base = Z pu.new Z pu.old V Base.old V Base.new 2 S Base.new S Base.old =
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X Line 2j := X Line.pu X Line Z Base.2 := X Line.pu 0.2604j = Z Load 0.9 0.2j + := Z Load.pu Z Load Z Base.3 := Z Load.pu 1.875 0.4167j + = Z
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This homework help was uploaded on 04/21/2008 for the course EE 4343 taught by Professor Giesselmann during the Spring '08 term at Texas Tech.

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Example 3.4 - Example 3.4 - Per Unit Calculations:...

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