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I did not know that you can get Dy0 transformers.

Unfortunately to avoid circulating currents the HV cannot be grounded as the connected circuit is already resistively grounded. This is a 3 phase 1MVA transformer.

We were in need for a zero phase shift transformer with the characteristics of a delta-wye transformer, and after some research we decided that a 3 winding wye-wye with buried delta could provide this (Yyn0d1). A well known manufacturer, has now provided us with a 4 limb wye-wye...

RESULT!!! I finally got a reply from the Trading Standard Agency, here it is. Croydon Trading Standards have held a meeting at their offices with representatives from Efficient Power Systems. The implications of a wide range of legislation was discussed with them, including descriptions and...

skogsgurra I think you have missed the point and similar to many people would be tricked by this. Would you buy this device, now that you think it will save you money? If you read the previous posts carefully you will realise that the device cannot measure current for the whole house from an...

Why does leaving a CT secondary open while passing primary load current, cause high voltages in the CT secondary windings and wiring?

I have wrote to the company with similar queries as above. Below is the reply i got back. I think they are still talking rubbish!! Thanks for your email and your questions. Here are the answers to your questions. 1. Reducing KvAr means that your devices will work more efficiently and that...

Also amusing!! On the advertising leaflet they distributed, the following words were printed "Fully Complaint with Safety Standards"

www.ep-systems.co.uk

ScottyUK I thought i would send details of the company and the product to the Trading Standards Agency. The company claims they have sold millions worldwide, and they have a fairly decent website which looks professional, and they have been putting leaflets in our local paper. So I wouldn't be...

I have come across a device which claims to save on your electricity bill. It is a UK device. I believe it is a con and want to take action against them, but before i do this i want to be sure that i haven't got it all wrong. The device is a small unit which plugs into any socket in the...

Thanks for your links, Jstickley, the K-factor or Factor K I was talking about was to do with transformer derating due to harmonics.

Could anyone give me any good websites which discusses the K factor (US) or factor K (europe)

Thanks The thing is I am investigating the use of induction heating and I wouldn't know what the coupling coefficient would be. Is the equation used a standard equation? If so does anyone know where I can find it?

I found this simple but useful equation on a website for induction heating, P = k.I^2.(u.p.f)^-0.5 where P is the heating power to the workpiece k is a constant I is the current in the pick-up coil u is the relative permeability p is the resistivity (ohms mm^2/m) f is the frequency From this...

An alternative grounding analysis program you might like to look at is GROD2002. You can find details of it on the following website: www.era.co.uk

Hi Could anyone give me some simple guidelines for some simple calculations on how i could calculate the amount of water and flow rate required to transfer heat from a steel object. Assuming 100% efficiency in heat transfer. The steel object is assumed to be maintained at a fixed temperature...