I grew up in So Central Los Angeles, 1/2 block from one of the original
2-circuit 230 KV transmission lines from Hoover Dam. Several times a
year, LA DWP came around with a tank truck and coupled it to a pipe
running up the tower. A guy climbed a ladder inside the tower, hooked
up a nozzle at each of the three phases, and blew a water/air mixture at
the insulators. then they moved on to the next tower. My noise level
always declined about an S-unit after the bath.
Often though, the problems aren't the insulators themselves but loose
hardware on the pole that create micro-arcing. Rain sometimes makes
that noise worse, and wind really can.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 9/11/2020 10:00 AM, Phil Kane wrote:
On 9/10/2020 4:19 PM, David Gilbert wrote:
Malaysia gets a lot of rain, things are wet much of the time, and back
then (at least 30 years ago) many of the electrical insulators on the
overhead power lines were dirty with pollution. I could see constant
arcing across dozens of insulators.
Yet one of the "cures" of QRM from electrical lines is to wash the
insulators. Many large utilities have a specialized vehicle for that.
We have buried utilities here so there's no insulators to wash....
73 de K2ASP - Phil Kane
Elecraft K2/100 s/n 5402
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