IEEE Color Book series 5

[pennsy]

This is a two part question. The first although is not related to the second.
1. Where can I get the IEEE color Book Series ?
and in which of the series is grounding(Residential/Commercial) covered?
2. In my area of Ohio anyway, the utility is doing away with the line fuses(aka, Line-cut outs) for the primary side of the distributiton transformers. I have heard many explanation as to why, such as they can rely on "burn-off" and some (as I think inane economical) such as it is cheaper. I supppose in light of the recent de-regulation, where they now charge for everything from changing a meter seal to reconnection, which used to be a 'gimme', now of course is a service charge.
But back to the line cut-outs, I an wondering is this the direction to go, to me it seems to be all too typical Politics.
WmColt

 

[busbar]

First question…
See

http://standards.ieee.org/colorbooks/

and

http://shop.ieee.org/

enter ‘color books’ search string

 

[peterb]

Question on question 2 -
Are these perhaps Completely Self Protected (CSP) transformers, with integral breakers for transformer protection? Otherwise, sounds like the principle of the TV picture tube self-destructing while protecting the 10 cent fuse.

 

[umrpwr]

WmColt,

To answer the first part of your question the Color Book series can be purchased through the IEEE as Busbar has pointed out and provided the links for. The IEEE Color books series is intended to cover Commericial/Industrial applications. It is well worth owning the entire set if you work in those areas of electrical design. I have the entire set and I think it sells for around $850 which is money well spent since the entire set has 10-11 books I think. The books are very practical and provide a lot of good information at a level that is accessible.

To answer the second part of your question about the elimination of the fuse cuts offs and allowing of "burn off" although maybe not be the most desireable design it does work. I actually was in the field and saw a case where that occured and it worked fine. As you pointed out though economics is also a driving factor sometimes in engineering design. The thing that should be considered is that this isn't one single application, but many throughout the entire system so costs can add up quickly when you consider how many diffrent locations there are.

Your question reminds me of another practice I came across once while doing protective relaying studies for a utility company. They used high speed ground switches on the primary side of substation distribution transformers in order to get operation of upstream protective devices. It worked and was economical, but I also don't know if it was the best design or think there were a lot of utility companies employing the practice. Engineering sometimes is just the best solution of design and economics that still meets the neeeds.

 

[jghrist]

Burn-off would not work at primary voltages. Most likely, the utility is starting to use Completely Self Protected (CSP) transformers that have the primary fuse mounted internally.

 

[busbar]

Second question…
It seems like various utilities go rounds on adoption of CSP pole-hung distribution transformers with varying success rates and option combinations. A couple of paragraphs on CSP features are:

http://www.cooperpower.com/Library/pdf/20110.pdf

 

[5P10]

Just to add on your first question. The grounding can be found in the Green Book.

 

[umrpwr]

In response to the post by jghrist I should clarify myself on the second part of my original reponse since I was not clear. If the fuses are removed on the primary side Jghrist is correct in pointing out that "burn off" will not occur at primary voltages. In the example I cited the "burn off" occured on the secondary side of a pole-mounted transformer. As both Busbar and Jghrist have mentioned these would be CSP transformers. Thanks for correcting me on the misinterpretation of the original question.

 

[jbartos]

Suggestion: Visit

http://standards.ieee.org/colorbooks/sampler/sample.html

for samples of color books

http://standards.ieee.org/colorbooks/sampler/Greenbook.pdf

for Green Book

 

[jbartos]

Suggestion: Reference:
1. IEEE Std 242-2001 Buff Book
for 5.8.5 Transformer Protection
Also, transformers may be protected on the secondary side only.
The pole transformers are protected internally, e.g.

https://www.kuhlman.com/clientdata/Distribution_Transformers_Web_Catalog.pdf

for: a pole mounted primary protected distribution transformer
or

http://www.abb.com/GLOBAL/ABBZH/ABB...BFD85256BBC0056B713/$file/SDTDescripBroch.pdf

for: Invisitran mounted in manholes, etc. (ABB Brain Power)

 

[pennsy]

I wish to thank each and everyon who responded to my post, I never expected such a response.
Since I am a new member I will always strive to live up to this high standard.
Thanks again, everyone

William O. Colt III

 

[SidiropoulosM]

pennsy: I'm relatively new here too. This is one of the most helpful and civized discussion forums on the internet. The opportunities to learn from knoweledgeable people are tremendous.

 

[SidiropoulosM]

Oops, BAD spelling: civilized, knowledgeable! It happens every time I post without previewing!

 

[wbd]

In response to removing the line fuses (cutouts, c/o), there are two possibilities:
1. The c/o is in place at the distribution transformer, high side, and when a new transformer is installed it is a CSP (completely self protected).
2. If these c/o's are on lateral's, perhaps the utility is installed new/more reclosers (1 ph & 3 ph)and they are performing the fuse protection function. The reclosers can be set in various ways with the new microprocessor control/relays to give time for a temporary fault to burn clear. The rule of thumb is that ~80% of distribution faults are temporary - tree limb, squirrel, etc.

wbd