short circuit calculations

Rotating-machine Reactance Multipliers

The momentary or first cycle current is used to evaluate the closing or latching of the high voltage circuit breaker. Other selection criteria are the interrupting and symmetrical short circuit currents. The sub-transient reactance of…


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Short-circuit Apparent Power of the System

In this article, I have presented the effects of utility fault level on low voltage equipment. Assuming an infinite bus as the utility fault level will have a significant cost implications particularly on the power…


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10 Reasons to Use Per unit

In the advent of computers, per unit or percent methods of calculations simplify short circuit calculations. J. Lewis Blackburn and Thomas J. Domin, in their book Protective Relaying, Principles and Applications, 3rd Edition, some of…


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