- Random electricity pylon transformer question!
Was camping at the weekend and while waiting for the wife to stop faffing I started looking at this pylon
Hopefully pic will work!
But why does the insulated cable come out the ground, then become bare wire, then into the transformer and finally back into the ground?
Why does it lose the orange insulation (assuming that’s the bit going into the transformer) and why not just stick it all on the ground?
Wife now thinks I’m even stranger than befoe9 for wondering these things and taking a picture of it.Posted 1 year agoprojectMember
Red cable in ground insulated,from moisture and damage, red for electrical cable,
bare conductors above ground so they can be seen easily if damaged, to reduce heat build up and so as not to need seperate insulation on each feed, not on ground for safety although some are in caged pens, which require a base, planning permission,a fence, and lots of signs,but you still need the pole, to support cables, so why not bung a transformer up there out of the way.
oh and its not a pylon its a pole mounted transformer.Posted 1 year agoMing the MercilessSubscriber
It looks like an 11kv/415v 3 phase pole mounted transformer. Maybe 500KVA. It could be historically that the site was fed via an overhead pole route and the orange/red cable is a new underground supply feed. It could be easier to stick the transformer up on a pole to get it out the way than build a compound for it (space issues).Posted 1 year agoigmSubscriber
Inverted pole equipment – probably a 200 or 315kVA.
The red cable is 11kV. The black 400V.
The transformer is designed for open wire HV connections so you can’t terminate the 11kV cable on to it.
Basically it is a cheap way of putting a substation on to an underground network. Circa £10k instead of £30-50k for a ground mounted substation.Posted 1 year agoOnzadogMember
igm pretty much beat me to it. Transformers are either ground mounted or pole mounted and due to the connections, you can’t mix and match.
Sometimes, you need to connect a cable, rather than an overhead line to a pole mounted transformer like the one in your picture. There needs to be a point where underground network connects to overhead network and here, it happens just before the transformer.
It may be that this location used to be fed by over head lines. Either because of price or permissions, the overhead line might have been replaced but they couldn’t/wouldn’t/didn’t build a ground mounted substation.
It’s actually a pretty common arrangement and found on a lot of rural networks.Posted 1 year ago
Thanks, this place is great for answering questions that although seem simple to people who know the answer, are a puzzle to the average man who is just curious as to how things work!
My daughter will be a bit disappointed about my mole theory being wrong though. Maybe I won’t tell her the truth just yet…Posted 1 year ago
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