transformers | Page 2

transformers

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  1. S

    Delta-Wye Transformers

    Hi Guys, I'm looking for some information or diagrams on Delta-Wye transformers. Most diagrams that I have got, give me information for 3 lines to a Delta configuration then on the secondary side you get the Star configuration. I am really happy with the above concept, I would like to...
  2. N

    Insulation Resistance test with 12v transformers

    I am installing a C/U and the kitchen has some old Down lights installed with 10 x 12 volt transformers connected. I know I could disconnect all the transformers but I don't plan to do that as it will be a real pain due to how the plasterboard has been bodged. Some opinions suggest the IR...
  3. D

    Step-up and Step-down Transformers

    Wanted to start a discussion on wiring transformers in reverse. What are some important considerations for what you wire a step-up transformer in reverse to make it a step-down transformer. And what are the important considerations when you wire a step-down transformer in reverse to make it a...
  4. N

    Introduction & Advice wanted

    Good afternoon, I've currently got a metal and plastic recycling facility, we normally just take in plastics but are licensed for metals. We've recently recieved some transformers to be recycled, from what I know, 500KVA Dry transformers, they weigh about 1500kg each and I've got 3 with all...
  5. P

    Step up and Step down transformers

    Hi guys I am currently training to be an electrician and have only been at college about 6 months. So my understanding of things isn't particular great. Anyway I have recently come across transformers and whilst I understand the general idea is to either increase or decrease the voltage for a...
  6. exdevonboy

    LV Transformers & Radio Interference

    Hi all, A customer has recently replaced some of his 12V MR16 down-lighter bulbs with LED bulbs instead. One of the transformers (which were old) failed a month or so after he installed the new bulbs and I was asked to replace both of his existing LV transformers. They supply 4 No downlighters...
  7. A

    Led downlighters flickering

    Hi guys, Had a little job today where some led downlighters were flickering it was 3 out of about 15. I checked the voltages on the 3 which told me the transformers for each one are broken. Confirmed this by testing a working one which was a getting a steady 11.5 to 12v ac. I was just wondering...
  8. R

    MR16 halogen with dimmer replacement

    Hi, I believe this is a DIY job but do correct me if I am wrong. I have a number of spot lights MR16 50w which are on dimmers and I would like to change them to LED. They all have individual transformers and I am unsure as to whether I would have to change the transformers also. Your advice...
  9. M

    client does not want to pay? but work is not complete complaining??

    currently took over someones job on a control 4 system "huge home automated system" due that being an extra they paid my boss separate for this. alot of lighting has Big transformers which had to be put local to the control 4. doing this i had to make connections "wagos and tape" due to many...
  10. S

    Mr16 Transformers

    Am I right in thinking that if I had a 12v 28w constant current transformer then I could wire up as many 5w MR16s in series until I get to 28w or just below? Ie 5x 5w MR16's? Or have I got it wrong? Cheers.
  11. O

    How To Connect Two Distribution Transformers Together To Supply Electricity To A Community

    Pls how can two distribution transformers be connected to supply power to a community. I need the information so urgent. Thanks
  12. O

    How To Link Two Transformers To Feed A Community

    How can a 300KVA 11/0.415kv distribution transformer and a 300KVA 33/0/415KV distribution transformers be linked together to supply electricity to a town?
  13. H

    Transformers

    Probably a really basic question, but something that has been bothering me never-the-less. Say there's a traditional 2-1 transformer (so couple of windings on a core), and the secondary has no load on it (or is open circuit by a switch etc). What happens in the primary - does it keep using power...
  14. N

    12V LED Drivers

    I am gradually replacing filament & halogen bulbs with LED versions. Whilst some LED lamps work okay with standard 12V transformers, the transformers don't like low current devices, resulting in flickering. Since the idea is to save money and energy, I don't really want to outlay large sums of...
  15. H

    Minimum Power - Transformers

    I'm trying to fathom the science behind why certain transformers need a certain power in order to work. What I've got is this, and wondering if someone can confirm my thinking: 12v output, 30W load - resistance of 4.8ohms 12v output, 2.5W load - resistance of 57.1ohms Is it because as the...
  16. T

    Power/Distribution Transformers and Large High and Low Voltage Switchgear

    Hello All, We are looking for high voltage transformers and large switch gear We can pay good prices for equipment as we refurbish the gear Have any of the above please send me a message Thanks
  17. E

    small building site temp distribution

    I am setting up some temps on a small site consisting of approx 3 110 transformers 2 portacabins offices sitting on top of each other, a portacabin toilet and a portacabin drying room. The supply is a 3 phase DB. Im thinking use 1 phase for the trannys, 1 phase for the offices and the other...
  18. H

    Help with led problem!

    Hi I have been to replace 2 bathroom wall lights from mr16 to 2 new led lights, however due to wiring issues, I have had to put the transformers in the loft. The lights will not work and I believe it is due the the length of the existing 12v cables and the fact the new led lights do not draw...
  19. D

    Transformers... 12v to 230v to 19v... Or 12v directly to 19v...

    Hi chaps, I'm in the midst of kitting out my motorhome (converted Renault Master). Going to have a 1000w inverter in there to feed a couple of 230v outlets. Trying to work out how much more efficient it will be to get a charger for my laptop which will convert directly from the 12v vehicle...
  20. W

    Transformers

    I have a Dewalt 24v chop saw. The batteries have had it and after checking online, someone have converted his drill to run off a transformer by taking the dud insides out of the battery casing and wiring in a conection to a transformer so he could then slot the battery back into his drill and...

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