transformers | Page 4

transformers

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  1. S

    Importance of Power Transformers?

    Electricity or power has become the major part of our daily life and without electricity we cannot imagine a life today. Most of our household appliances work on electric current. We face various power problems due to voltage fluctuations. Sometimes our home appliances malfunction due to voltage...
  2. R

    Wire wound 12V transformers

    Morning all, I've just received an email from a technical department regarding a tradtional "wire wound" 12V transformer. He tried to explain that a 300W wire wound transformer needs to have 300W worth of lamps connected to it, as the transformer cannot regulate the power it outputs...
  3. A

    Step up transformers

    Hi all Having a bit of a nightmare, client has specified a particular Inverter for a 250KWp installation but upon clarification, as its transformer-less and Chinese, I will now be required to install a step up transformer from 270V to 400V. Does anybody have any idea where i can source one...
  4. D

    Fire damage after loft insulation installed

    Hi all, went to quote up a rewire on lighting circuit in a bungalow today. It turns out that they had new insulation laid just over 2 weeks ago. The insulators had left room around the light fittings (recessed 12v 50w halogens) but they totally covered up the transformers. After a quick look...
  5. D

    10kva transformers

    how do you do an rcd test on a 10kva transformer
  6. D

    what frequency do 'HFAC' low voltage transformers (like varilight) typically output?

    Hi, I'm replacing low voltage halogen with MR11 and MR16 LED bulbs. AC supply would be simplest because of existing wiring, but I'm concerned about LED flicker: Characterizing and Minimizing LED Flicker - Lighting Solutions | DigiKey I'm looking at varilight transformers: VARILIGHT...
  7. J

    School Lab Transformers

    Good evening forum friends. I have recently gone self employed and I am in the process of quoting various school maintenance in the local area. The only thing I have not done in the past is testing lab transformers. CAN SOMEONE PLEASE HELP AS I CAN NOT FIND ANY INFORMATION ONLINE. I believe the...
  8. R

    transformers

    Hi I just installed a 5000va transformer 240 - 110 v and cant see what protection there is on secondary side for short circuit. now i take it that it's a centre tapped safety isolating transformer because in getting half the secondary outlet voltage between line to earth (would it be visual if...
  9. W

    Transformers...

    Hey This may sound like a really stupid question but the jobs 40 miles away and i need to be sure! Basicallyc ustomer has a decorative light fitting with 20 10 Watt g4 capsules lamps, the transformer has packed up and needs replacing , their is just one Pos and Neg at the base of the fitting...
  10. M

    Is there an issue with connecting 2 transformers together?

    Hi all Need to connect my cabinet kitchen lights. Already have the feed from the switch. I have 2 transformers that feed 3 lights each. (They came as part of a package so the transformer is rated to power all 3) Can I simply connect the feed from switch into 1st transformer connector block and...
  11. F

    LED MR16 on standard transformers and dimmers

    Hi all. Simply put: Looking at changing standard 50w MR16 lamps with 7w Warm white MR16 LED's Existing transformers are Aurora AU-PD60 20-60W/VA Electronic Transformer Existing Light switches are Lutron Rania single channel (non LED compatible) Have any of you had past experiences running MR16...
  12. R

    Testing Transformers

    Hi, Could anyone give me some advice on methods of testing 12v transformers if at all possible? Why I ask is because been to a customers because one of the under cabinet 12v lights wasn't working. First I tried changing the lamp which didn't work but worked in another fitting. Then just assumed...
  13. M

    Temperature Indicators on Transformers

    Hey Everyone, Suppose we say the 'Temperature for Alarm is at 90 Degrees C' and the 'Winding Temperature Alarm is at 103 Degrees' on Transformers, At what point of the transformer are we actually getting these readings from. I see RTD's connected to the top of the main tank from the outside...
  14. T

    High power 12v leds

    Hi guys, Im changing some down lights in a hairdressers with high ceilings and need some high power directional (38degree or thereabouts) 12v leds. Preferably ones that will work with the existing transformers but i no thats hit and miss depending on what transformers they have already. Ive...
  15. M

    Ceramic / Electrical Bushings For Transformers

    Good Day to Everyone, I have a doubt that google has not been very helpful because I do not know the 'right terms' to be googling for. Ceramic Bushings that are used for transformers have a structure similiar to the ones shown here (Openelectrical.org) I noticed all ceramic bushings have...
  16. N

    LED Driver

    I have recently bought a reel of SMD LED strip lighting. I know it's suggested that you use an LED driver to power these but they seem very expensive. I was wandering if I could use a standard electronic transformer used for powering LV spotlights, as long as I meet the minimum load? I struggle...
  17. C

    Buzzung dimmer

    had a look round a friends where there's x8 12v down-lights witch all have individual 20-60va dimmable electronic transformers, these lights are switched by a 400w GET dimmer switch which buzz's quite loudly when they are dimmed but works fine if the switch is fully on you can also hear some...
  18. M

    110v transformers

    again would sincerely appreciate a bitof help have a client who wants a mix of stuff doing all in small numbers not really my normal work but have splashed out on a seward 250 to accomadate him and having a few issues on a coulpe of things namely 110 v transformers could some one please...
  19. R

    led lighting interferance

    Hi All Has any one else had this issue, ive recently replaced some 12V down lights for LED lamps and supplier confirmed the existing transformers were ok, anyway since fitting if they turn the lights on the radios will go off any were in the house and it does not matter what station they listen...
  20. G

    reasons for DNO decisions on limits, transformers and balanced phases?

    Hi all, I just wanted to pick some brains ahead of having a chat with a potential customer. Essentially it's a farm with a single phase supply, but an 11kVA 3 phase line a few hundred yards away. There are actually 3 farms clustered together, and I'm thinking it's likely that they're all fed...

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