I have been day dreaming of a drone with ability to squirt a small
amount of water fairly precise on pole hardware as most of these sources
vary with humidity/rain. I have not played with a drone yet so do not
know if this is practical.
Chuck
W4NBO
On 9/23/21 8:25 PM, Charlie Delta via RFI wrote:
I have been doing a lot of reading on methods to detect and resolve some of
these more difficult problems with powerline RFI.
There is an amazing amount of information and techniques that can be used that
goes beyond the typical methods that hams use.
Do a search on the subject of "partial discharge" There are many tools that can
be used to diagnose these poles and infrastructure.
For example, read some information from this company and others like Doble.
https://www.powermdt.com/partial-discharge
https://www.powermdt.com/sensor-technology
Companies like Doble and their PDS100
https://www.doble.com/product/pds100/
The technique of HFCT measurement could be used with a simple homebrew current
probe. However, I would be very cautious about fiddling around and connecting things like
a current probe around an arcing poles ground lead. I tried simulating a similar ground
lead discharge using a Fischer RF current probe and current limited arcing source, and
it seems to work. The same goes for a capacitive probe that is nothing more than a
high voltage coupling capacitor to direct couple the noise.
The above-mentioned Doble PDS100 is a low resolution spectrum analyzer that costs 20 thousand
dollars. Something like the TinySa with a current probe and preamp and bandpass filter for UHF
detection could equally with. The specifications on the PDS is worse than those early CATV cable TV and
Satellite TV spectrum analyzers. They are simply using the spectrum analyzer with an an initial spectrum
scan to establish the background noise floor then they connect the sensors to establish if there is any partial
discharge activity. There are huge range of readily available scientifice and engineering papers all freely
available. The powerMDT web page has some good technical information on the discharge characteristics of arcing
and corona sources that can help identify the sources of such emissions. Companies like Biddle also sell a UHF PD
spectrum analyser equipment. Even readily afordable spectrum analyzers like the base model Rigol have better
specifications than these PD analyzers.
I just found some of this technical information on the techniques and measurements very
interesting. I am not an expert in the field. There is certainly a lot more useful
information on these companies web pages than you will find from sources like Radar
Engineers and the Loftness book.
73CraigVK3OD
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