Power lines/substations
Discussion
A geeky query for any electrical engineers out there..
Electricity that gets fed into houses at a street level, leads back to a street-level transformer. From there, where does the electrickery come from, between pylon and street? Is it directly from a substation, or does it hop via other street-level transformers? Are the lower voltage cables underground now..?
Just wondering about the path from pylon to home/office.
Electricity that gets fed into houses at a street level, leads back to a street-level transformer. From there, where does the electrickery come from, between pylon and street? Is it directly from a substation, or does it hop via other street-level transformers? Are the lower voltage cables underground now..?
Just wondering about the path from pylon to home/office.
http://www.lcra.org/energy/education_safety/getpow...
Edited by Papa_Hotel on Tuesday 29th September 14:45
Someone who knows something will surely be along in a minute, but I think the "Grid" is really the Pylon bit, at 400kV or so.
The transformer in your street, if you live in a town, is usually fed by an oil filled cable running at a much lower HT voltage. The practical implication is that there is more than one transformer between the consumer and the grid.
As to the arrangement, one step out from 240/415V system, I'd guess it's highly variable, depending on how the geography of roads, and places to route the cabling suits.
The transformer in your street, if you live in a town, is usually fed by an oil filled cable running at a much lower HT voltage. The practical implication is that there is more than one transformer between the consumer and the grid.
As to the arrangement, one step out from 240/415V system, I'd guess it's highly variable, depending on how the geography of roads, and places to route the cabling suits.
Edited by dilbert on Tuesday 29th September 15:10
Most street level transformers are fed with an 11kv feed, which may be a sigle HV, or a loop in and back out again.The Sub may also have a bank of HV switches for the 11kv feed to spur off in other directions.This street lever transformer will drop it to 415volts for your customer feeds.
The 11kv feed will come from a primary substation, usually on the outskirts of a small village,or there may be several in a town.The primary substations will be fed at 33kv and transorm it down to 11kv,then out by cabale(usually) to the street level transformers.The primary subs may be cable fed or overhead fed.
The primary subs are fed by 132kv substations,again dropping it to 32kv.The grid is what supplies these subs,and are transfromed from 400kv down to the 132kv.The grid subs are flipping huge,have a google for Nursling or Melksham, or St,John's Wood,although that is all indoors and cable fed.
That's just scratching ths surface,and there are many exceptions to that!
The 11kv feed will come from a primary substation, usually on the outskirts of a small village,or there may be several in a town.The primary substations will be fed at 33kv and transorm it down to 11kv,then out by cabale(usually) to the street level transformers.The primary subs may be cable fed or overhead fed.
The primary subs are fed by 132kv substations,again dropping it to 32kv.The grid is what supplies these subs,and are transfromed from 400kv down to the 132kv.The grid subs are flipping huge,have a google for Nursling or Melksham, or St,John's Wood,although that is all indoors and cable fed.
That's just scratching ths surface,and there are many exceptions to that!
Edited by normalbloke on Tuesday 29th September 15:53
dilbert said:
Someone who knows something will surely be along in a minute, but I think the "Grid" is really the Pylon bit, at 400kV or so.
The transformer in your street, if you live in a town, is usually fed by an oil filled cable running at a much lower HT voltage. The practical implication is that there is more than one transformer between the consumer and the grid.
As to the arrangement, one step out from 240/415V system, I'd guess it's highly variable, depending on how the geography of roads, and places to route the cabling suits.
Most oil fileld cables are 33Kv+ and dont usually feed the 11kv subs.The transformer in your street, if you live in a town, is usually fed by an oil filled cable running at a much lower HT voltage. The practical implication is that there is more than one transformer between the consumer and the grid.
As to the arrangement, one step out from 240/415V system, I'd guess it's highly variable, depending on how the geography of roads, and places to route the cabling suits.
Edited by dilbert on Tuesday 29th September 15:10
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