Electrical Engineering - All Comments

re: ABB Technical Guides - Motor Operation

Steven — Sun, 07 Mar 2010 05:18:09 GMT

I have not used DOCWIN. We mainly AMTECH here. If you Google you may be able to find something, otherwise I would just play around with the software.

You could also try starting a forum post and see if anyone else has examples.

re: ABB Technical Guides - Motor Operation

beho2000 — Sat, 06 Mar 2010 17:31:32 GMT

Thanks alot for this guide

Could you pleas help me to find ( Worked Example on DOCWIN)

best wishes

re: Voltage Level Confusion

Steven — Sun, 27 Sep 2009 06:41:57 GMT

Electropedia has the following definition for medium voltage:

medium voltage (abbreviation: MV) (not used in the UK in this sense, nor in Australia)

any set of voltage levels lying between low and high voltage

NOTE – The boundaries between medium and high voltage levels overlap and depend on local circumstances and history or common usage. Nevertheless the band 30 kV to 100 kV frequently contains the accepted boundary.

re: Closed Doors

stephanie — Fri, 18 Sep 2009 03:09:21 GMT

Feynman met with Uri Geller, who tried (and failed) to read his mind or bend keys for him. Feynman does not rush into conclusions; he only comments that because of Geller's failures, he was “unable to investigate that phenomenon.”

re: Aluminium Windings - Dry Type Transformers

Steven — Sun, 05 Apr 2009 12:23:46 GMT

My aluminium winding experience has been with Siemens because they only manufacture aluminium windings. Have to say that I have never had any problems and the transformers work great. Of course copper windings also work great (to me both are acceptable).

Talking of problems and a bit off topic, I also think that when selecting a transformer it needs to be suitable for the intended environment/loading and that surge arrestors if used are correctly sized. I have recently come across an instance where this was not done and they have had several transformer failures.

re: Electrical Engineering

Steven — Sun, 05 Apr 2009 12:15:02 GMT

I've also looked after chair lifts in mines, conveyor belts, rock hoisting systems and pumping systems. Electrical engineers are obviously a pretty versatile bunch of people. :)

Experience outside our area of expertise is always good as it make us better engineers (and keeps us thinking).

re: Voltage Level Confusion

ManjoloPhiri — Thu, 02 Apr 2009 09:38:35 GMT

The terms "High Voltage"," Medium Voltage", "Low voltage" are relative terms. Which means you are free to define them according to where you are working. Forexample where I work we have different voltages: 220V, 400V, 550V, 3.3 kV, 11 kV and 33 kV. So we have defined high voltage as anything above 650V, Medium voltage is above 240V up to 650V, low voltage is anything 240V and below. This is working for us.

re: Electrical Engineering

ManjoloPhiri — Thu, 02 Apr 2009 09:19:03 GMT

Agreed. As an experienced electrical Engineer I have found myself dealing more with instrumentation, electronic, networks, and process automation problems. Dont be surprised to hear that I have looked after mechanical aspects of crushers, diesel mining equipment, pump chambers, civil construction projects etc. In third world countries when you are an electrical engineer you can do anything!

re: Aluminium Windings - Dry Type Transformers

ManjoloPhiri — Thu, 02 Apr 2009 09:06:58 GMT

The only reason I would allow the use of Alluminium windings in a transformer is the price difference between copper and alluminum. Copper is the best material so far for transformer windings whatever electrical parameters you consider! Please transformer manufacturers continue using copper afterall the price is now down!

re: Electrical Engineering

ElecMan88 — Thu, 19 Feb 2009 07:24:25 GMT

Nice to see the blogs are back.