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Old 04-23-2012, 05:57 PM   #16
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Talk about living life on the edge


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To work on a line like that hot, you put on a wire mesh suit. If you didn't have one on, the capacitance of you body would flow enough current to kill you even if you weren't in contact with anything grounded.

Rob
The guys I always seen doing it wore chain nail suits,watching them bond on is cray.
I do a lot of work for AEP and have opportunities to witness a lot of bazaar stuff,the last time we errected transmission towers we used helicopters and I got to go up with the flight crew,it was amazing.

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Old 04-23-2012, 06:49 PM   #17
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When there is a second wire halfway up the pole, going from pole to pole as a neutral/ground, it is still customary to have grounding electrode conductors at each pole or every other pole going down to ground rods.
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Old 04-23-2012, 07:33 PM   #18
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more videos



http://www.youtube.com/watch?v=lcjhj...eature=related

Last edited by M3 Pete; 04-23-2012 at 07:36 PM.
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Old 04-23-2012, 11:21 PM   #19
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i got involved with this when i noticed the order of the bushing CTs did not match the drawings. there were two CTs on there for differential protection and they were configured such that the two differential zones would not overlap. CTs were adjacent to each other so what would the chances be of a fault in the bushing, between the adjacent CTs, such that neither differential would pick up? purists were saying the bushings needed to be pulled and the CTs restacked. keep in mind the transformer was already on site, in the northern urals region of russia...in winter. winter field modification of CT stacks on 500 kV transformer bushings? sign me up!
If there was a fault between the CTs, at that voltage it would destroy both CTs in a very short time.

Then you'd have tons of differential current, and if the relay is set properly and still works, it'll trip the feeder breaker instantly.

Depending on what the 87 relay was, it might be able to be reprogrammed to match the other CTs ratio, or if it's a multi-ratio CT, possibly the tap could have been changed to match the relay setting.

Then it'd be a simple matter of swapping the secondary leads rather than rebuilding the CT bushing.

You're right, anything to do with the primary of bushing CTs is a royal bear!!
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Old 04-23-2012, 11:29 PM   #20
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When there is a second wire halfway up the pole, going from pole to pole as a neutral/ground, it is still customary to have grounding electrode conductors at each pole or every other pole going down to ground rods.
Some POCOs do, some don't. Around here, it's every third pole unless there's a transformer mounted on it.

They use grounding plates here instead of rods. Basically, they're a round copper plate about 8 - 12" in diameter that is fastened to the bottom of the pole before it's set into the ground.

I'd like to see the scrappers steal those!!!

Lol.

Silly info; the brand (A round steel or aluminum disc about 1-1/2 or 2" in diameter, usually recessed about 1/2" into the pole) is almost always 12' from the bottom. If you can see the brand on the pole, you'll know how deep it is into the ground.
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Old 04-23-2012, 11:33 PM   #21
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The guys I always seen doing it wore chain nail suits,watching them bond on is cray.
I do a lot of work for AEP and have opportunities to witness a lot of bazaar stuff,the last time we errected transmission towers we used helicopters and I got to go up with the flight crew,it was amazing.
Setting poles and other stuff with helicopters is interesting. There's no stop with a helicopter, the load is always moving up or down a bit.
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Old 04-23-2012, 11:38 PM   #22
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Just a quick note here, I'll be going out of town tomorrow to connect the instrumentation to a good-sized control panel on an oil refining plant. I'll be gone for about 2 weeks, so when I don't respond here, I'm not ignoring anyone, I just won't have a computer for a while.

Rob
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Old 04-24-2012, 04:37 AM   #23
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Setting poles and other stuff with helicopters is interesting. There's no stop with a helicopter, the load is always moving up or down a bit.
Yup and when the hook up man isn't ready the helicopter does a drive by with the meter still running.
As for still moving around, I was setting 40' x 20 ' Simon panels with a 22250 Manitowoc that had 300' of main and 100' of jib it was like flying a box kite.
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Old 04-24-2012, 06:45 AM   #24
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There are high power lines about 100 ft outside my 4th floor office. One day I hear a loud engine and look up into the eyes of a helicopter pilot. It appeared somebody was hanging out the otherside inspecting the ceramic isolators. In this case just a fly by. I was hoping to see him climb on the wire.
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Old 04-24-2012, 07:46 AM   #25
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Just a quick note here, I'll be going out of town tomorrow to connect the instrumentation to a good-sized control panel on an oil refining plant. I'll be gone for about 2 weeks, so when I don't respond here, I'm not ignoring anyone, I just won't have a computer for a while.

Rob
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Old 04-24-2012, 08:36 AM   #26
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If there was a fault between the CTs, at that voltage it would destroy both CTs in a very short time.

Then you'd have tons of differential current, and if the relay is set properly and still works, it'll trip the feeder breaker instantly.

Depending on what the 87 relay was, it might be able to be reprogrammed to match the other CTs ratio, or if it's a multi-ratio CT, possibly the tap could have been changed to match the relay setting.

Then it'd be a simple matter of swapping the secondary leads rather than rebuilding the CT bushing.

You're right, anything to do with the primary of bushing CTs is a royal bear!!
the issue was related to the existing switchyard differential scheme. it included all the units at the station and was old-school electromechanical equipment. ratios for that were set. swapping CT leads wouldn't have helped. my argument was if there is a fault in the bushing, something is going to pick up (overcurrent, etc.), even if differential does not. and what are the chances the fault is exactly in the 1/2" gap between differential CT windings?

i'm not sure how they ended up resolving it.

all you diyers out there, pay attention to this germane topic!
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Old 04-24-2012, 09:53 AM   #27
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all you diyers out there, pay attention to this germane topic!
WE all get power from somewhere so I find it quite interesting. I've often wondered how much juice is in those wires hanging from the "robots"
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Old 04-24-2012, 10:04 AM   #28
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WE all get power from somewhere so I find it quite interesting. I've often wondered how much juice is in those wires hanging from the "robots"
i spent the first ten years of my career as an electrical engineer at a consulting firm specializing in power generation. i'm not too familiar with the distribution side but if you have any questions about the generation side, fire away!
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Old 04-24-2012, 03:22 PM   #29
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i spent the first ten years of my career as an electrical engineer at a consulting firm specializing in power generation. i'm not too familiar with the distribution side but if you have any questions about the generation side, fire away!
This winter we revamped the cooling tower at AEP Cardinal and put in a system that was the first in the USA and only the second in the world.
I have some awesome pictures of us demolishing the ring,it was all post tension and rotten concrete
The new water pipes are 35 feet in dia.
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Old 04-24-2012, 03:40 PM   #30
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This winter we revamped the cooling tower at AEP Cardinal and put in a system that was the first in the USA and only the second in the world.
I have some awesome pictures of us demolishing the ring,it was all post tension and rotten concrete
The new water pipes are 35 feet in dia.
man, i miss the scale of the generation plants. 10,000+ HP ID fans with VFDs as big as a semi trailer, 20,000+ amp isolated phase bus duct with forced air cooling, 200,000+ amp available fault current at the station aux power transformers, 144 cell duct banks that were 15' deep, etc.

fun stuff!

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