A motor starting case study for any
given electrical network can be performed by reduced the network to a smaller
equivalent network consisting of a source (generator / grid), the starting
motor (largest motor), other large running motor and a lumped load.
This MS Excel based spread sheet is
based on this concept and present a small model of electrical network that can
be adapted for such motor starting case studies.
This is very helpful especially for
quick checks as follows:
- What is the largest motor size that can be started with a given generator rating
- What should be the rating of the generator (or nos of generator operated in parallel) for a given load and largest motor size
- Knowing voltage drop during starting conditions for given motor details and hence deciding the key parameter during design (say max allowable starting current)
- Deciding the cable size / number of runs etc.
The spread sheet performs an
iterative calculation based on pre-start load inputs and starting motor data.
Detailed analysis may be performed with the help of available software.
Download the Motor starting calculation by MS Excel spread sheet
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