:notworthy::notworthy: That pure awesome! And thank you!
So it seems ring buss came from or was predominately a European thing?
Also, what interesting is it seem the earliest ring buss systems were simply manual switches for the ease of switching devices for maintenance, while the breakers (fault interrupting) where still directly in series with the outgoing feeder like single breaker single buss.
Did they not have the relaying technology back then to do the same with the breakers?
Since the main purpose of a ring main/buss
Seems to be to fight voltage loss,
I would guess that it hails from the DC era.
And as far as I know only the UK use it.
So maybe post your question on the UK forum ?
Maybe some of the old timers over there will know ?
Our secondary network feeders come off a ring buss. They're still used in the states, one of the most expensive but also most reliable substation designs. If one part of the buss faults or needs to be deenergized for work, you can sectionalize the buss to keep everyone hot.
Single buss with sectionalizers I believe. Same with the 26KV although there are 26KV rings for network areas here, and a 26KV ring in at least one sub for overhead distribution. The substation guys would know more. Up here every sub is different, not a single sub is the same. Most subs do have 3 incoming transmission lines that feed the switch yard (buss), then hit the XFMR which may be an auto, or not. Then hit the distribution switch yard, and finally out too the customer.
I operate a system where we have all types of loops and rings in are older portion of our system. We have stations where we have multiple transformers in parallel that feed a linkage bus, which is then paralleled with the individual bus's, with operating points to sectionalize if needed. We have looped power lines that come of the different bus's from two positions that feed out and are tied all the way through. We have networks where we bank all the secondaries. The older portions of our system were built with loops and rings in the stations, on the lines, and in the secondary for reliability. It doesn't really have to do with loading due to the fact that if you take a portion of the system out of service it now becomes a radial feed and may not be able to handle the loading. we also have distribution lines that are a 4.8kv ungrounded delta that are ringed as well. Wire comes down/tree on the line, theres no fault since its ungrounded, and the lights stay on since its a ring. The relaying and voltage controls in this part of our system are very complex though compared to our 13.2kv wye system which is all radial feeds.
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