Here is the video that I took last night. You can see arcing on the top of the center and right insulators, faint but the best I could get. At the 52 second mark, a brighter arc grows on the right bottom of the center insulator and disappears. The insulator on the far right has two arcs at the top, one on the left and one on the right. It's interesting that all of the arcs are lined up with the wooden cross arm. The cross arm runs north-south and the lines run east-west. All the arcs are on the north and south side of the insulators.
This morning, there are two recurring arcs, 1.5 msec from each other every 8.3 msec and then it changed to one arc every 8.3 msec. We are have extreme heat today so I will be watching the scope today to see if load is modulating the problem or for whatever else I can find before re-engaging the utility tomorrow. It's 9 AM now.http://youtu.be/EHoJ6ecurvo
See if you can correlate the arcing with your RFI... If the arcing is not causing your RFI, (i.e. you don't hear it when you see it), then ignore it for now... Use two cell phones if need be, so you can hear it from your home QTH, while looking at it to be sure... No matter what, let the power company know you believe something is arcing and let them know that you are not requesting a fix for the arcing at this time, assuming there is NO correlation, of course if there is, let them know it IS your RFI source. Do everything you can to maintain a good relationship with your power company, short of allowing RFI to exist, which causes you problems, that they can fix.
Only worry about your strongest RFI source. It is like peeling an onion, remove RFI one layer at a time... I have a brief write up on the tools available, (software, and hardware), for locating and characterizing RFI at:http://nk7z.net/rfi-now/
You will fin a large number of RFI related items on site by going to the "Site Navigation" box on the right, and clicking "RFI Mitigation". That will list every RFI related article on the site.
Also, keep a detailed log of EVERYTHING you do, and say to anyone... If you note times, write them down, if you talk to anyone, note the date/time, and what you talked about... That way, later on, YOU will know what happened, and not using memory to quote what happened... People take you much more seriously if you can tell them, you spoke to so and so, on such and such a date, about whatever... Also, always be nice to everyone... Once you have a log book of things done, things seen, and things noted, you can look back on it for the next time RFI hits... Notes are probably the single best thing you can do... Short of unplugging the source of RFI...