[TowerTalk] FW: High voltage transmission lines

[James Chaggaris]

I personally just look at how many suspension insulators are strung together
(count the number of skirts in the insulator string).  But I'm also in the
business so it's second nature.    

73,

Jim N9WW


James E. Chaggaris
President
PowerOne Corp.
1020 Cedar Ave.
Suite 110
St. Charles, IL 60174
Phn:(630) 443-6500
Fax:(630) 443-6505
Cell:(630) 669-2241
Web: www.pwrone.com

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Terry
Sent: Monday, October 22, 2007 2:39 PM
Cc: towertalk at contesting.com
Subject: Re: [TowerTalk] High voltage transmission lines

How do you all find out what voltage the HV lines are near you?  Are there
searches/maps available on the internet?

73 de Terry KK6T

Kelly Johnson wrote:
> My experience is similar.  I live only about 200 ft. from some HV 
> lines and about 100 feet from the MV lines.  The MV lines are by far a 
> bigger problem for me.  The ONLY time I hear noise from the HV lines 
> is when it rains.  Fortunately for me, it doesn't rain that much here 
> in California.  The noise from the HV lines is definitely loud when it 
> rains, but the rest of the time they are MUCH quieter than the MV 
> lines.
>
>
> On 10/22/07, Terry Conboy <n6ry at arrl.net> wrote:
>   
>> At 11:32 AM 2007-10-21, Steve K8JQ wrote:
>>     
>>> A possible home site I'm looking at is situated between two high 
>>> voltage transmission lines. The two transmission lines run roughly 
>>> east-west and are approximately parallel to each other.
>>>
>>> The transmission line to the north is either 345KV or 765KV (I 
>>> received conflicting information) and was constructed in the 1990's.
>>> It is about 800ft distant from the home site.
>>>       
>> This echoes the comments from Roger, VE3ZI.
>>
>> I worked for an electric utility in Oregon in the 1980's and if I 
>> were you, I'd stay far away from lines with anything close to 500 kV.
>> All these lines exhibit corona, which is especially pronounced during 
>> precipitation or heavy fog.  The corona generates incredibly loud 
>> noise, both audibly and in the RF spectrum.  The noise is worst in 
>> the low bands and declines at higher frequencies.
>>
>> The original designs for 500 kV lines used a single conductor per 
>> phase, but they made so much noise that even VHF TV reception was 
>> affected for nearby homes.  Newer lines use two or three spaced 
>> conductors per phase to lower the voltage gradient and reduce the 
>> corona, but they are still bad.
>>
>> We had a 500 kV line with two-conductors per phase from a generating 
>> plant in eastern Oregon.  It passed about 1/4 mile from a ham who 
>> liked to ragchew on 80m SSB.  Fortunately, that's a pretty dry area, 
>> but anytime it did rain, he had to shut off his radio in disgust.  He 
>> filed complaints (with the PUC, I think), but there really wasn't 
>> anything to be "fixed", unless you think that shutting down a 550 
>> megawatt plant or relocation assistance (for the ham) would qualify as a
fix.
>>
>> 73, Terry N6RY
>>
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