transformer

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  1. D

    How to improve the cooling of 2000 kVA ONAN transformer

    I have a transformer with ONAN cooling (natural ventilation like figure) and 2000 kVA that works always near full capacity, in summer it over heats above the limit. to improve the cooling and prevent reaching the oil temperature limit. I decided to place an exhaust fan and an inlet fan like...
  2. G

    Are there any foolproof ways to find an old lighting transformer?

    I am in the process of having some renovations done and as a small part of this I am planning to replace a set of outside wall lights. I asked my electrician what the voltage was and was told 240v so I bought a set of weatherproof 240v LED lights. For various reasons I have had to change...
  3. K

    transformer

    hi i have a battery charger which has stopped working after checking the transformer, it seems like its us what size transformer do i need 12v battery 3.5amp charger i think i need a 14v out put power supply is 240v the ones i have seen on ebay, all seem to be 220v 40w thanks
    • knares
    • Thread
    • ausie elec transformer
    • Replies: 6
    • Forum: Australia
  4. M

    20 amp transformer switch question

    Hi. All. I have a trasnformer that takes 220v from wall and outputs 20 amp 5v to a string of leds. I want to put a switch beetwen the wall and transformer. Could a regular lamp switch do it? or should a put a 20 amp switch?
  5. J

    UK How to wire a panel transformer

    I have a panel transformer with the input options of : 415V 220V 0V and output options of 110V. I’m using this so the control panel will run 110V and not 415 or 220. I have a three phase supply and how would I wire this into the transformer and also how do I wire the output. Where does 0V go and...
  6. R

    UK What size transformer!

    Hi all, I have a new mixer it is 110v with 2000w motor and a 16amp socket, what Kva transformer do I need? I am not a sparks and electric is all magic to me!! Thanks
  7. D

    Do transformers produce more power than what is put in?

    This might sound like a stupid question but I just don't get it. A electrical engineer at my work who works mainly on the high voltage areas like transformers and sub stations said that the 11kv step down transformers draw only 55 amps on the incoming and that would provide 230v on the outgoing...
  8. B

    Source for desklamp transformer

    hi, this is my first post. I doing a simple repair of my wife’s favorite 50w halogen (50w, 30w), desklamp. I think the transformer died. it is a 120v to 12v and spits out 50w or 30w current by way of a toggle switch. no current out of the dc end, might as well replace it. Easier said. what...
  9. M

    Calculation of resistors for premagnetizing a transformer

    Existing situation: 3150kVA transformer, 11kV/450V no load losses 6300W. Existing premagnetizing resistors with power losses 322kW for 5s. Due to increase in power demand, a new transformer has to be installed: 11kV/470V no load losses 8500W. Would the above mentioned resistors be enough? And...
  10. S

    Undercabinet Lighting Transformer to LED

  11. M

    Can I DIY replace downlight transformer?

    Yes I know what the answer is and you're going to shoot me down in flames... but I'm tired of calling in a sparky every time one of my downlight transformers die. I've seen how they work and how he screws the wires back in .... how unsafe is it for me to replace one of these myself and match...
  12. S

    Replacing Halogen MR16 with LED MR16 - transformer or driver?

    Hi all, first post so be gentle... I've recently decided to replace the MR16 50W Halogen bulbs in the bathroom with 5W LED ones. I'm aware of the general feeling against MR16 bulbs and preference of GU10's but they're not real options in this situation.. There's a lot of information available...
    • sjwsjw
    • Thread
    • driver halogen led mr16 replacing transformer
    • Replies: 3
    • Forum: Lighting Forum
  13. B

    Timer Transformer leads to cut wire?

  14. Designmen90

    Current transformer - wiring

    Hello ?, is there any regulation of wire cross section for current transformers? Somewhere I read that wires from transformer to Amp meter (for example) should be minimum 2.5mm2, but on some other site I read that it must be minimum 4mm2 ?. I don't know where I read it, but I read it. What is...
  15. R

    415v to 110v transformer

    I'm ready for the abuse but I think I'm having a brain fart.... I'm fabricating a small centrifuge oil panel, all materials are here for me, it's my first foray into panel building and there isn't anyone to ask really, without getting a faceful of abuse. So they've supplied me a 415v to 110v...
  16. S

    Alternative dimmable transformer with dual input

    Please help! A number of my mother's lights in her kitchen are no longer working and I suspect the transformers need replacing as I had a similar problem in our kitchen that I fixed by changing them. I took a couple of her spotlights out to see if she could use the same transformers as I have...
    • sarahm
    • Thread
    • alternative dimmable input transformer
    • Replies: 2
    • Forum: Lighting Forum
  17. D

    Is this box my bell transformer?

    Hello All Always risky posting a picture especially this one with the cables not clipped nicely etc. Can only assure its not my work and was done 20+ years ago. Anyway, caveat out of the way ,is that black box the transformer for the bell? And is it being fed by that socket outlet plate...
    • Deleted member 112675
    • Thread
    • bell box transformer
    • Replies: 21
    • Forum: UK Electrical Forum
  18. J

    Transformer neutral reading 28v

    I’ve seen a 110v control transformer reading 28v on the neatral to earth and 67 on the other leg. Why would this be?
  19. J

    Can you Change a 55v 0v 55v transformer

    Can you Change a 55v 0v 55v transformer to 110v by just connecting the earth to one end of the windings on these type of transformers?
  20. F

    Need Help: Mechanical Chime Won't Ring After Transformer Replaced

    Hi. Here's some background info. I am located in the United States, and have had a Nest Hello video doorbell working perfectly for a couple of years. It's powered by a 16V 10va transformer. I also have a mechanical door chime that rings when someone presses the button on the Nest Hello. The...
    • ftresi
    • Thread
    • after chime doorbell help mechanical need help replaced ring transformer won't
    • Replies: 14
    • Forum: DIY Electrical Advice

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