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B.Sc. Engineer (EEE)
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Electrical Circuit 2 Full Course : https://www.youtube.com/playlist?list=PLMjaJoGgWV1keRc_srmbRKLpih7gA6pC_
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Power System Analysis : https://www.youtube.com/playlist?list=PLMjaJoGgWV1lctIDff-DhCQd5WFTqtl7h
Communication System : https://www.youtube.com/playlist?list=PLMjaJoGgWV1nNjZXvcps2TrjdloXQxwbn
The various components of a power system like Alternators,
Transformers, Induction Motors etc., have their voltage, power,
current and impedance ratings in KV, KVA, KA and KΩ
respectively
❖It will be convenient for analysis of power system networks if
the voltage, power, current and impedance ratings of components
of power system are expressed with reference to a common value
called base value
❖For analysis purpose, a base value is chosen for voltage, power,
current and impedance
❖ Hence, All the Voltage, Power, Current and Impedance ratings
of the components are expressed as a percentage or per unit of
the base value
❖Per unit value of any quantity is defined as the ratio of actual
value to the chosen base value in the same unit.
Advantages of Per Unit Computations
❖Manufacturers usually specify the Impedance of a device or
machine in per unit on the name pates
❖ The various components of power system and their
interconnections are usually represented by single line diagram
❖ In a single line diagram, the components are represented by
standard symbols and their interconnections are shown by single
line with the representations in per unit quantities
*Per Unit system math of power system analysis..
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Per Unit System Math Solution, Power System Analysis
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