[BC] Now, THIS is a job!

[Chuck Lakaytis]

And when they heat up, they droop more.  Many outages have been traced to 
that fact.

Chuck Lakaytis
Director of Engineering
Alaska Public Broadcasting, Inc.
135 Cordova Street
Anchorage, AK 99501
907 277 6300
907 277 6359 FAX
907 301 4339 Cell
----- Original Message ----- 
From: "Mike McCarthy" <Towers at mre.com>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Sent: Thursday, April 26, 2007 7:25 AM
Subject: RE: [BC] Now, THIS is a job!


>I have a piece of line from a 340KV project ComEd did here about 15 years 
>ago.  It's about 1.75" in diameter and heavy...about 5 lbs for the 2 ft. 
>piece I have.  I have a very healthy respect for those towers and  the 
>people who installed and maintain them. A couple men were killed on this 
>particular line a couple years ago when working on the tower and got a bit 
>too close to the live cables.
>
> I had a friend who was part of the communications managing team at the 
> company and he regularly told me of stories about how high and hot the 
> company lets those cables operate.  It wasn't uncommon for them cables to 
> operate at 170 deg. F or higher during the summer months.  As we both 
> know, the hotter the cable the more resistance increases. But with direct 
> contact to air, the cables can dissipate the heat too.
>
> There is a very good reason why the utility companies are pushing for 
> super conducting cables....
>
> MM
>
> At 08:08 PM 4/25/2007 -0500, Bill Smith wrote
>>Actually, it applies to all electrical wiring. You can obviously have 
>>higher
>>temp rise in outside conductors. The type of conductor is specified for 
>>the
>>maximum rating and allowable sag of the conductor. Bad things happen when
>>115 KV sags in 14 KV for example.
>>
>>Don't forget, conductors are much larger than they appear from the ground
>>and currents in the several hundred amp range are not uncommon.
>>
>>Bill
>
>
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