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 Topic Title: P28 Guideline for Renewable Generation Guideline Topic Summary: Simplified Calculation tool Voltage Drop on transformer Energisaion Created On: 25 September 2012 04:00 PM Status: Read Only Linear : Threading : Single : Branch
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 25 September 2012 04:00 PM mikebuchan Posts: 1 Joined: 21 November 2002 Any one aware of a simplified calculation tool to assess the voltage drop at the PCC on energisation for a Grid Connected 300KVA Transformer. 28 September 2012 12:26 PM fshillit Posts: 18 Joined: 14 August 2002 You could download the electromagnetic transient software PSCAD from the Manitoba Research website. The free student edition will give you enough nodes to model the transformer, feeder back to the PCC, and network infeed. You'll need to know the inrush curve for the transformer. The help pages and examples are fairly detailed. Regards, Francis Shillitoe 04 October 2012 03:40 PM Will2000 Posts: 2 Joined: 10 November 2009 I'm looking into this as well. If you have any luck could you send some details this direction please. I'll look into PSCAD over the weekend and see what I can come up with. Cheers 05 October 2012 08:27 AM JohnRRussell Posts: 22 Joined: 02 December 2003 There's a 2009 CIRED paper "A simplified method for estimating voltage dips due to transformer inrush" that describes the inrush model developed for the IPSA system study program but which also has a 'rule of thumb' calculation that might be good enough for your 300kVA transformer. The problem will be not so much modelling the voltage dip as getting any real data on the transformer. Most manufacturers of distribution transformers seem to have little clue about inrush currents. 05 November 2012 06:44 AM raturner Posts: 1 Joined: 27 October 2009 The following paper describes the methodology and provides some simulation results for assessing voltage dip as per P28 for a range of transformers: http://www.ipst.org/techpapers/2011/papers/136.pdf You might be able to extrapolate the curves to give an estimate for your transformer.
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