[TowerTalk] High voltage transmission lines

[Terry]

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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>>
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