transformer | Page 5

transformer

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  1. Rocboni

    Transformer testing

    Hi All, So i was asked to look at at large 3 phase to 120V transformer around 85kVA - it was tripping the MCB instantly (it never used to) I insulation resistance tested the primary windings to earth - >2000ohms I continuity tested the windings and got 0.46 ohms per winding, they were all...
  2. Z

    Door Bell Transformer

    I hoped someone might advise please: I'm replacing my ancient ( probably 40+ yrs old ) door bell transformer with a British General unit mounted in a Wylex housing, fed via a switched fused spur. The previous unit had a switch only, it was fused at the consumer unit connected into a lighting...
  3. S

    Transformer from socket wire to trickle-charge Ring Doorbell - Is this safe?

    I have a Ring Doorbell which has no Chime, but which is trickle charged via a wall-mounted BG DIN Rail transformer in a Hagar casing which diverts power from a socket cable. Firstly I have a electric check coming up and I wanted to know if this was safe or is it likely to be picked up in the...
  4. C

    110v transformer

    Installing a wall mounted transformer. Single phase with 2 x 16 amp sockets Input connections are 240v 220v 0v 10v Output/secondary side 55v 0v 55v Whay would the connections regarding the input/primary side live neutral earth. The 10v is throwing me off
  5. N

    Replace Friedland Type 4 chime transformer for Ring doorbell

    Installing a Ring doorbell - followed all the instructions and the ring is not powering on. I believe the issue might be the transformer in the chime box isn't powerful enough for the job. Ideally I could just replace the transformer pictured below with a newer unit which has the required specs...
  6. 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...
  7. 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...
  8. 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
  9. 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?
  10. 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...
  11. 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
  12. 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...
  13. 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...
  14. 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...
  15. S

    Undercabinet Lighting Transformer to LED

  16. 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...
  17. 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...
  18. B

    Timer Transformer leads to cut wire?

  19. 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...
  20. 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...

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