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I thought I would just add a point about odd and even harmonics - just because i never knew why we only dealt with odd hamonics. If an even harmonic component is added you will see (it is difficult to explain without drawing) that the resultant waveform has an interesting symmetry. The start of...

cbarn, Thanks for your thoughts - I have no knoweldge of the drive since this is being specified and installed by the press manufacturer. I didn't realise that the regen could be big ('forward' power of the press is in the order of 10mW). Also do you know (mathematically) how you size the...

I hope someone can help with this. It has been driving everyone in the office MAD. We are involved in a project with large printing presses. The press manufacturer has told us AC drives with regenerative braking is used. Since we have generator back up, we cannot allow this regenerative load...

Does anyone know if a 12kV ring main unit with 2 transformer T-offs is available (as a standard unit). If not is there any reason? Thanks in advance

fb, I believe these are two separate requirements of the regulations. IP ratings are for ingress protection whereas SELV is the method required for protection against electric shock, therefore you must comply with both. Also the degree of protection required (IPX4) protects against water...