User talk:C J Cowie

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[edit] Welcome

Hi, C. J. Cowie, and welcome to Wikipedia, the free encyclopedia! Hope you like it here, and stick around.

You are doing great, but just in case here are some tips for you:

  • To sign your posts (on talk pages, for example) use the '~' symbol. To insert just your name, type ~~~ (3 tildes), or, to insert your name and timestamp, use ~~~~ (4 tildes)
  • Since you are already using Edit summary box, you could also take advantage of Show preview button
  • If you need help, don't be afraid to post a question at the Help Desk or on my user talk page
  • Explore, be bold, and, most importantly, have fun!
  • Oh, and very impressive education and experience you have!

Good luck! Renata3 19:40, 30 September 2005 (UTC)

And thank you so much: Cowie, Charles J. (2001) Adjustable Frequency Drive Application Training, Powerpoint presentation. Excerpts donated to Wikipedia by the author.


[edit] Electrical v electronics engineering

No indeed, the vote is an up or down thing. If version 2 loses, the page gets put back exactly as it was before I started changing it. At that time, we will need to start over again.--Light current 18:33, 24 November 2005 (UTC)

[edit] Test

Test 1

Talk:Electric motor#does horsepower really equal 750 watts?

hydrostatic drive

http://en.wikipedia.org/w/index.php?title=Vibrator&oldid=71470815

[edit] Luton flashover

I have started a section on substation design and protection, and I would value your input on something. It is the Luton flashover and related matters.

The Luton flashover was interesting becuase what happened was that an arc from a HT conductor to earth occured. This short then caused circuit breakers to open becuase of the overcurrent. Too many protection devices were activated and then everything went to pot. The defense against such an overreaction in the event of such a fault which I was told about was that a substation has all 'earthed' metal work isolated from earth except for one cable which passes through a current transformer. If current is detected in the earth cable then the location of the fault is clear to the protection electronics. Hence with good design of the protection systems it is possible to open fewer circuit breakers then it would be otherwise. The problem is that I do not have the references to back up this design concept which I was told about some years ago by a substation expert.Cadmium 21:32, 1 January 2006 (UTC)

My area is adjustable speed motor control. I don't know very much about substations. --C J Cowie 23:25, 1 January 2006 (UTC)

[edit] Autotransformer

Well spotted. I hadn't noticed that. Variac has certainly gained the status of a genericized trademark – it was only fairly recently I learned it wasn't the general name for such devices. If you feel the caption shouldn't say that, please just change it in any way you feel appropriate. BillC 00:57, 13 January 2006 (UTC)

[edit] Electronic engineering certification

I am pretty sure that the statement you added about the role of IEEE in certification is not accurate. They may offer continuing education that may be required for renewal, but I don't think they do certification anywhere. In the USA, engineers and many other professionals and technicians are licensed by individual states. Some states may require certification by non-governmental organizations for some fields, but I don't think that is the case for engineering. In most if not all states, engineers are licensed after submitting evidence of education and work experience and passing an exam. Non-governmental organizations may play a role in the exam process, but I believe state government agencies are primarily responsible. -C J Cowie 15:33, 12 January 2006 (UTC)

Which article are you talking about? If you are talking about Electrical engineering, all I did was change "certification" to "professional certification". So if that sentence is inaccurate, it was there already. I'm pretty sure disambiguating cert. to prof. cert. is correct. Similar change with Certified Software Development Professional. As you can see from just from the title of that article it is pretty clear that IEEE performs professional certification. Are you sure you're not confusing licensure (mandatory to legally practice a profession) and professional certification (not legally required) ? —Quarl (talk) 2006-01-12 19:17Z

I am talking about Electronics engineering#Chartered or certified engineers. That section seems to be mostly talking about licensure. The section may not properly distinguish between certification and licensure. The whole article considerably overlaps the Electrical engineering article. There are a lot of specialty societies within the IEEE. There may be a few specialty certifications offered by those societies, but there are not certifications for the overall profession or most specialties. In the USA, my state (Wisconsin) issues one license for "Professional Engineer" without even indicating the major fields: electrical, mechanical, civil etc. The term "registered professional engineer" is also used. I think other states have similar licensing. The Wikipedia articles on electrical engineering, mechanical engineering etc. should all probably have similar sections describing USA licensing. -C J Cowie 14:38, 13 January 2006 (UTC)

Ah, I see. Yes, that article wasn't distinguishing, e.g. the advantages of certification vary depending upon location... in the United States and Canada "only a licensed engineer . How does it look now? Feel free to change it. —Quarl (talk) 2006-01-13 19:50Z

That is better. I have been finding various information scattered around:

I am still looking into things and thinking about what should be done. -C J Cowie 20:27, 13 January 2006 (UTC)


[edit] Image Tagging Image:Terminal Blocks 01CJC.png

Warning sign
This media may be deleted.

Thanks for uploading Image:Terminal Blocks 01CJC.png. I notice the 'image' page currently doesn't specify who created the content, so the copyright status is therefore unclear. If you have not created this media yourself then you need to argue that we have the right to use the media on Wikipedia (see copyright tagging below). If you have not created the media yourself then you should also specify where you found it, i.e., in most cases link to the website where you got it, and the terms of use for content from that page.

If the media also doesn't have a copyright tag then you must also add one. If you created/took the picture, audio, or video then you can use {{GFDL-self}} to release it under the GFDL. If you believe the media qualifies as fair use, please read fair use, and then use a tag such as {{fairusein|article name}} or one of the other tags listed at Wikipedia:Image copyright tags#Fair_use. See Wikipedia:Image copyright tags for the full list of copyright tags that you can use.

If you have uploaded other media, please check that you have specified their source and copyright tagged them, too. You can find a list of 'image' pages you have edited by clicking on the "my contributions" link (it is located at the very top of any Wikipedia page when you are logged in), and then selecting "Image" from the dropdown box. Note that any unsourced and untagged images will be deleted one week after they have been uploaded, as described on criteria for speedy deletion. Thank you. BRossow 15:51, 16 February 2006 (UTC)

[edit] PDM/digital power inverter

"I am not familiar with PDM, but it appears to me that the zeros and ones all have the same fixed width and the modulation consists of..." The differnce between PWM and PDM, is that with PWM the pulserate is constant, but with PDM, the pulerate is propotional to pulse width (the wider the pulse, the lower the pulserate), I hope that helps you understand.Myrtone (the strict Australian wikipedian)(talk)


[edit] Photograph on main page

Congrats on getting your photo on the main page-- I always said it was a good one!--Light current 01:08, 26 March 2006 (UTC)

[edit] Repulsion motors

Thank you very much for all the hard work you put in on the repulsion motor section of electric motors. Great addition to the article. Pcb21 Pete 07:24, 12 April 2006 (UTC)

And on that note another "missing topic" that I am trying to find a home for is reluctance motor. As Electric motor is our main article in this area I would like to redirect there, but I don't want to do such a ham-fisted integration job as I did with repulsion motor. Are you able to help out? Pcb21 Pete 08:27, 12 April 2006 (UTC)

[edit] Energy portal

Hi! As a contributor to WikiProject Energy development, I thought you might like to be aware of the opportunity to contribute to the new Energy Portal, now that there is one... No need to reply. Gralo 17:31, 3 October 2006 (UTC)

[edit] Inverter (electrical)

WikiThanks

Thank you for the improvement of the inverter article! CyrilB 20:22, 3 November 2006 (UTC)

Yes, thank you very much. A schematic of 6 pulse, 12 pulse, etc. would be significant help. Are you artistically inclined? If not, maybe you can point me to an online diagram which I will reproduce? — EncMstr 22:06, 12 November 2006 (UTC)
I have drawn a number of diagrams for Wikipedia articles. I have been thinking that this article needs some more diagrams, but haven't thought much about which ones.C J Cowie 22:25, 12 November 2006 (UTC)

[edit] Ref Desk Question

Hi, I saw your post on the talk page for Electric motor and I would like to ask for your thoughts in response to a question on the necessary modifications for a generator to be used as a motor which someone asked on the Reference Desk Wikipedia:Reference desk/Miscellaneous "question 4.21 generator to motor". I had a go at it but you clearly have greater expertise and I could only answer in generalities, since my work as an EE does not deal with rotating machines. Thanks.Edison 23:12, 29 November 2006 (UTC)

Thanks a bunch! My comfort level was not high for getting specific on motor to generator conversion. Homw brew attempts are likely to turn out badly. I've dealt with the power coming from generators and the power going to motors, but not so much with the internals. I do know there are many ways to smoke'em. Electronic soft starts for large motors were a blessing and high efficiency motors (high inrush) were a pain for those who must avoid flicker. I note your writing on inverters: I have always admired the flexibility utilities had in the early 20th century, when they routinely had DC generator and huge battery banks for central business districts (today served by low voltage ac networks), but they had rotary convertors which could convert any which way between AC 60 Hz, AC 25 Hz, and DC to provide flexible operation, and where a generator might have windings to produce both 25 Hz (for industry and traction) and 60 Hz for flicker free lighting. Regards. Edison 16:45, 30 November 2006 (UTC)

[edit] Energy portal & future selected articles

Hi! Over the past couple of months I've been spending much more time than I should developing the Energy portal, and intend asking for a portal peer review within the next day or so.

The portal provides a showcase for energy-related articles on Wikipedia. One of the most prominent ways is via a the selected article that is currently changed every 6 weeks or so. It would be good to increase this turnover, and with three Wikiprojects dedicated to energy-related topics and a good number of articles already written, I'd like to suggest that members of each Wikiproject might like to use the 'selected article' to feature some of their best work.

With this in mind, I'd like to suggest that your Wikiproject bypasses the normal selected article nomination page and decides collectively which articles are worth featuring - or these may be self-evident from previous discussions - and add short 'introduction' to the selected article at the appropriate place on page Portal:Energy/Selected article/Drafts, which includes further information. Your personal involvement would be welcome!

Please make any comments on your Wikiproject talk page, my talk page, or on Portal talk:Energy/Selected article/Drafts, as appropriate. Gralo 15:30, 1 March 2007 (UTC)

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