OP
Besoeker
More bang for your buck??The joys of being a bad grumpy git. Enter manager “who’s on the job” "TNT" exit manager.
My shift fitter was also called Tony. We didn’t get the nickname TNT for nothing!
Discuss Way to Save Energy Bill By Power Down STand-by Transformers in the UK Electrical Forum area at ElectriciansForums.net
More bang for your buck??The joys of being a bad grumpy git. Enter manager “who’s on the job” "TNT" exit manager.
My shift fitter was also called Tony. We didn’t get the nickname TNT for nothing!
Sent
Now I’ve seen the system it doesn’t make a lot of sense to me either. But like many things, if you don’t know the history, you don’t know how the system evolved.
You once asked me about the systems I worked on saying they were badly designed, they weren’t designed they evolved over many years. Bits added, bits chopped out, it was never ending change. While ever it worked we had to make do with it.
That last drawing of mine, the generators must have moved house more times than me. Originally they were on a plant that was demolished many years ago.
Hello Gentlemen,
Thanks for all your interest in this topic. I encounter problem of even uploading small portion of diagram and symbols.
Here is the description, hope it helps.
Red Node : VCB in Close position;
Black Cross : VCB in Open position;
Cross in Circle : Bus Tie;
Green Switch Symbol ; Earth Switch
The Single Line Diagram is showing currently switching status.
Only had time for a quick overview at the moment, but i find the VCB and COUPLER Open/Closed positions on the 11KV and 6.6 KV switch boards a little confusing. I take it that P1-P2 and P5-P6 are out of service at this time??
What industry is this distribution system supplying power to?? By the looks of things you have 4 incoming 11KV utility supplies coming in to the site, are these incomers supplied from the same utility substation or are they derived from two different utility substations??
I'll have another look at your single line drawing later on....
P1-P2, P5-P6 are outgoing feeder to load, the VCB are always in "ON" position.
Actually there are 2 location sites, site "A" and site "B" about 3KM away form each other. Each site Sub-station is supplied from 2 incoming feeders tapping off from MV Ring Main of Utility company.
The stand-by generators are located in site "A", its back power is feeding to both "site "A" and site "B".
Due to company confidential policy, pardon me not disclosing its details here, one thing I can assure you is, it is a legal facility.
From what I can make of it.
Thanks Tony for taking the trouble to draw a clearer diagram, you are absolutely right, it is exactly as per actual installation.
The bottom portion representing a total black out from utility whereby generators are supplying to all the loads. During scheduled load test with only one generator, or managing peak hours tariff, the generator power is fed to one section of Bus Bar only, i,e, operating both utility and generator supply concurrently without paralleling the two sources.
How about you now showing us (using Tony's drawing) the main VCB Open /Closed positions when operating the system with both utility and generator supply concurrently. Because from how i remember your original drawing you are only using one utility incomer on site 'A' and you had some bus couplers closed on LV switchboards??
Hello brother, please refer thread #60, I paste the content here for your convenience.
"My sincere apology, it is my oversight that the red dot was accidentally moved away from VCB #8.
Normal operation conditions:
Site "A", VCB "ON" position are #6 & #8; #2 & #12;#4 & #6, feeding generator power will require changing over between #4 - #6, or #8 - #10.
Site "A", VCB "ON" position are #5 & #8; #1 & #11;feeding generator power will require changing over between #3 - #5, or #8 - #10."
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