The latest revision of engineering recommendation P28 provides comprehensive guidance on the assessment of motor start-up and how this effects the voltage. Large industrial processes employing the use of motors may cause voltage dips in excess of the allowed envelopes if the Point of Common Coupling (PCC) fault level is not sufficient. This paper aims to explore the available solutions that can be employed to solve these issues.

The paper starts with a demonstration of a typical direct on line motor start-up simulation and the resultant voltage dip. It then explores a number of mitigation methods including – MV capacitor banks, LV capacitor banks, STATCOM’s, VSD’s and the effect of an increased PCC fault level. It explores each of these options and demonstrates the improvement to the PCC voltage dip and any other considerations.

When it comes to this issue there are a number of possible solutions when it comes to mitigating voltage dips caused by the start-up of large motors. These different options all have merits and drawbacks in terms of performance and cost. As always, a specific power system study should be carried out to fully explore the available options.

Check out the full paper here –  Solving Motor Start-up P28 Non-compliance

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