Electrical Power System Study

depending on the level of study you have got, u might have known about differential protection.

Dear Friend Yr subject of protective relays and fault analysis is the most useful study.Modelling of 50HP motors/their fault contribution study for power system analysis of the industrial plant might b relevant for the particular industry. For utilities/major power stations(Mega/ultra mega)/petrochemicals/refineries the electrical network is quite large and complicated. For system studies fault contibutions from the LT motors is negligible and is generally ignored. Only HT drives(modelling and fault contribution) are considered for arriving at more authentic study. B & TC ravipra

Utilities, in their load estimate information requests, generally ask
for the 'largest motor, and 'total motor load`, lumping all other loads together.
Some require 2 Nd. & 3 Rd. largest motors, but not too many.

When you're dealing with something as large as a utility grid, the percentage
of reactive load is more important than any individual reactors size.