| The Breakroom > The Water Cooler |
| Too Many Volts |
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| AdeV:
Watching men work on live 132kV cables (the ones on big pylons) is pretty scary... they drop them onto the cable with helicopters! :bugeye: |
| awemawson:
If, on a dry day a pigeon lands on a 132kV line, then flys off and lands on the ground, does it get a shock at either end of it's journey :scratch: |
| lordedmond:
no just a tingle in its feet :D i should not tell you this but levy can transform a crock of a bull to a pedigree bull , it works like this a earth fault up a wooden pole over head line , thus a voltage gradient in the ground bull walk to pole and gets 20 volts between front and back legs DEAD bull on insurance claim its the pedigree bull QED hence a sparks will take very small steps when approaching wooden poles you do not want volts across your legs :lol: Stuart |
| vintageandclassicrepairs:
Hi Andrew and All, WHen I first looked at your photos I was puzzled as to why they cut the droppers to the transformer ? Then I noticed that theres a HV cable heading off underground, Is this the supply to the ind estate? Usual method of isolating the trafo would be to pull the HV disconnect on the pole just before the trafo Obviously they did not want to disrupt supply to the cable ?? I worked regularly in the outdoor 110Kv switching and transformer compound attached to the Power station where I was a spark and later also undertook instrumentation I found that workking near HV would lead to chronic fatigue ?? it was also very difficult as the ground was covered in a layer 2-4 in. stone One job I undertook there involved recabling from a generator breaker to the 10/110kv tranformer The old cables were paper insulated, lead sheathed, steel tape armoured ! 3 x 300 sq mm. 8 runs of cable about 100yds long in a concrete duct These had to be cut in 3ft lenghts and manually carried out due to live overheads :doh: The new cables were 24 runs of single core 300sq XLP copper, so they were cleated together every metre or so in threes, giving 8 runs of 3 phase "cable" arrangement , The end terminations had " 3M cold shrink" silicone rubber insulators All this was replaced with an indoor SF6 gas insulated indoor setup about the time I took Voluntary severance 6 years ago Best move I ever made :D John |
| awemawson:
The transformer is fed 11kV from two directions. There is the overhead route via that isolator that you have spotted on our boundary with the water pumping station, then there is the red cable running down the pole which crosses our drive underground, and goes across the A21 to another pole where it continues above ground. The industrial estate is only fed 415 v three phase in the bundled cables to the right of the transformer that call first at our house where we take one phase at 240. Incidentally the water pumping station has a three phase 415 v feed down the pole and into their premises under our vegetable patch for which I don't think they have a way leave, a fact I'll keep up my sleeve I case I need leverage in the future :ddb: It seems that somehow they weren't told about the arranged power outage, so they've had yellow flashing lights there this evening sorting out whatever mayhem it caused their system! |
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