A very small percentage of power line rfi sources are related to the primary
conductor, except the induced voltage created by the primary. This field of
voltage induced into hardware on the pole is created at even 2kv. However
the lower the line voltage the less the problem occurs.
Number 1 source is ground conductor to the staples that hold it to the pole.
This is also why transformers get a bad rap. Transformer poles have a ground
conductor going down the pole and always gives produces a stronger signal
when looking for the source.
Next is pole top pins. This is the steel pin mounted to the top of the pole
that holds the insulator supporting either a single phase or the center(B)
phase. It is mounted by two bolts one carries the weight and the other is
loose and sparks.
Third is slack span bells aka deadend bells. This sparking occurs between
the insulator units and the pins that hold then together. As you can see
changing hardware is rarely necessary and usually causes more noise due to
moving and shaking up the environment.
These problems are most common in the distribution voltage range. This is
because it's more common to have distribution on wood poles as compared to
steel structures. The wood shrinks and causes the hardware to loosen.
Have a good week, I'm going to Vegas to get rich. Yea right.
Mike Martin
RFI Services
Cell 240-508-3760
Office 301-855-5961
Nextel Direct 164*21*29180
Fax 410-741-5153
mike@rfiservices.com
Check out Our Web Site at rfiservices.com
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|