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What is the voltage violating limit to be considered for
load flow study? What is acceptable deviation limit
according to relevant standards?



What is the voltage violating limit to be considered for load flow study? What is acceptable devia..

Answer / omar aziz

Mostly standards (IEEE , ANSI) recommend 5% however, in
practical situations where a sound judgment can be made you
can strech it upto 10 - 15% at the load bus depending on
your min. voltage allowed by the motors/ other equipment.

Motors can usually start at around 80% rated voltage ,
however other electronic equipment such as UPSs are very
sensitive to voltage variations.

Consider the load before selecting this threshold otherwise
stick to 5%

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