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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Not along the conductor, no. But the insulators supporting a busbar can develop hot-spots from corona on their surfaces, and bolted joints can develop hot-spots from excessive I2R losses due to a poor contact. Likewise switches and breakers attached to it.
I'm not suggesting it as an option, I'm stating that this is in fact how it is done in the power industry. I've seen the reports.
Registered Member #311
Joined: Sun Mar 12 2006, 08:28PM
Location:
Posts: 253
Steve McConner wrote ...
Not along the conductor, no. But the insulators supporting a busbar can develop hot-spots from corona on their surfaces, and bolted joints can develop hot-spots from excessive I2R losses due to a poor contact. Likewise switches and breakers attached to it.
I'm not suggesting it as an option, I'm stating that this is in fact how it is done in the power industry. I've seen the reports.
Yes, but anything you can do with discrete sensors on the bar, as proposed by the OP, could probably be done with remote IR sensors without all the hassle of harvesting power and transmitting wireless data. Add an off-the-shelf motorised CCTV pan/tilt camera mount to the IR sensor and you can continuously scan a length of the bar. And you don't have to power it down to install.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Yes, a completely valid point, the logical conclusion of which is the thermal imaging camera. Contract a maintenance company to do the survey for you, and you don't need to install anything, just have your wallet wedged wide open at the ready.
Having high voltage plant not break down is worth so much money that the power industry has full-time troubleshooting squads, wielding gadgets that would make James Bond's "Q" jealous. I'm employed as a full-time researcher designing new ones for them. My personal favourite is the Daycor Corona-cam, which I sadly didn't invent.
Being able to do the survey without switching off the power is also worth a lot of money. Or even being able to do it without going anywhere near the place. Some areas in substations and HV plant rooms are designated unsafe because of old equipment that might explode violently without warning, throwing shrapnel hundreds of yards.
Registered Member #816
Joined: Sun Jun 03 2007, 07:29PM
Location:
Posts: 156
I kind of second what Mike just said use an IR thermometer, The other thing if you mount all your electronics on the Bar like I think you are saying, how hot do these things get before it becomes a problem. Your transmitter and psu may get toasted just when you need it. Unless you can mount them in an insulated box nearby and just run a short wire to the thermistor or whatever mounted on the bar.
You should try and estimate the power supply requirements for your electronics so to see if it can be met with a pick up coil and how close and how large it would have to be ect. I suppose you could use a large memory type back up capacitor if you need more power but just for a brief amount of time.
Registered Member #1565
Joined: Wed Jun 25 2008, 09:08PM
Location: Norway
Posts: 159
I am not so deeply into details, but as far as I know there are some fiber-optic sensors that can do the task.
a google search for "power over fibre" also gives clue for exsistence of systems to power whatever you put on the busbar. (I am not so sure the sensors would need electrical power, in other words that all is optical somehow)
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harvesting energy from 50Hz EM radiation
