transformer | Page 8

transformer

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  1. A

    Self Lm of transformer

    Hi. What is the range of self induction (magnetizing) of ferrite trans, specially the smps one ? Is it greater than the steel trans ?
  2. A

    Transformer specs

    Hi . I started to use Psim to simulate the smps but i dont know the specs (rs rp ls lp lm np ns) of ferrite transfo . I tried; rp 1ohm rs 0.1 ohm lp 220u ls 5u lm 0.1m but the circuit was extremly inefficient ☹️
  3. spud1

    PAT testing transformer plugtops

    When PAT testing is it necessary to carry out insulation resistance or load/leakage on a Class II (Dummy earth pin) transformer PSU type plugtop? (e.g. phone charger, monitor PSU) Or is just a visual inspection needed?
  4. U

    What building can I put 3-333kva, single phase distribution transformer?

    What building can I put 3-333kva, single phase distribution transformer?
  5. R

    Undersized low voltage transformer?

    I've just moved into a place that has low voltage halogen lights in the kitchen. I had a look at the installation and I see they are running 6x20w G4 halogens off a single DA-E60 transformer - specifications for the transformer shown below. I measured the amperage draw of the light bulb at 1.8A...
  6. P

    12 volt catenary lighting transformer?

    Anyone any idea where I can ideally get an identical or similar replacement transformer for this (used for 12 volt catenary lighting). Any suggestions appreciated
  7. UKMeterman

    Anyone want a 11kv 1MVA transformer

    Hi, I have spotted a 11KV 1MVA transformer on an auction site, buyer collects.. https://auctions.eddisons.com/auctions/7233/eddiso10604?page=1&pageSize=60
  8. J

    din rail mounted bell transformer - earth?

    hi i've bought a hager st303 din rail mounted door bell transformer and a 2 module wylex ESE2 enclosure for it to fit in. i was going to run this off a 3A FCU. i can't see any earth connection on the transformer from the photo - it haasn't arrived yet - and there's nothing to earth in the...
  9. Megawatt

    Will isolation transformer absorb in rush current and not the generator

    I have a 10,000 watt surge and 7000 watt running capacity on a 240/120 vac generator. Now this is a theory I have electric heat with 10,000 watt heating elements. When the heating elements kick on it bogs down the generator to the point I have to kill the heat. The question is if I bought a 15...
  10. M

    Secondary Transformer Circuit Breaker

    Hi, I'm just curious about what will happen if I use an MCB lower than the calculated current rating. I have a 1kVA 220v stepdown to 110V transformer, calculated downstream MCB current rating would be 11.3625 if i'm right I multiplied the secondary current to 125%? what will happen if I use a...
  11. A

    LED Lights - Transformer and Lights getting very hot

    Hi All Help... I have a strip of SMD 5050 LED lights - plugged in to a 12v transformer - and both (the LEDs and Transformer) get very very hot to touch. They take about an hour to slowly get up to the high temp - and sit there at that high temperature. The strip has been cut from a 5m length -...
  12. T

    Step up and Step down transformer

    Why is Delta star transformer used for step down transformer and star delta for step up transformer? According to this book, Electrical Power Systems By C L Wadhwa
  13. B

    Control transformer

    Had issues with a 240v to 120v control transformer not supplying power to 2 cooling fans. Both fans were connected to transformer via X1 and X2 wiring. X2 wiring was not bonded to ground initially. After bonding X2 to ground, fans would run. Any explanation would be great.
  14. J

    Switch before or after transformer?

    Hello- I'm planning to install a bunch of LED lights in my kitchen cabinets. The idea is to have a small LED strip turn on automatically when opening the cabinet door. I've found a 12v LED strip that can be cut into 30cm long sections that will be perfect for my application, along with some...
  15. S

    Hazardous areas - control voltage transformer earthing -

    I've been in an ongoing debate regarding earthing of a control transformer and i'd like some other opinions. 690 primary, 120v secondary supplying control circuits (contactors/DC convertors etc), the neutral is tied to earth - My issue is the location that it is tied to Earth. As far as I know...
  16. captaincaveman

    Do MR16 Led bulbs require a LED driver or a transformer?

    Hi guys, Quick question regarding 5x MR16 (Gu5.3) Led bulbs in downlighters. The customer used to use halogen but has moved over to LED. They had stopped working due to a faulty 12v transformer I've just replaced the transformer with a constant voltage driver (1-25w) but with any more than 3...
  17. L

    Please help...at the end of my tether with transformer/Ring

    Hi guys, Really hoping for some simple advice after a 2 year battle with my Ring Pro doorbell. To cut a long story short, and spending £ on several plugin transformers and multiple replacement Pros, I have decided to use the 24v bell transformer supplied from Ring. So, (and excuse incorrect...
  18. S

    LED transformer advice needed

    Hi, I’m wanting to remove two plug sockets that are labelled 12v only linking two strings of led 15mm spot lights. I would like to replace them with in line transformers and hide under the fireproof downlight covers in the loft. One plug is 6v 500mA DC leading to bathroom led lights x6 (2watt...
  19. N

    CAn I wire 12v downlighter transformer into dimmer circuit?

    Hi all. I've bought couple of LED tape kits which come with a 3pin 12v transformer. one of them is now wired into a simple circuit which is a single on/off switch and works great. the second set is to go into another room, again single switch but this time it's a dimmer not toggle. The kit is...
  20. C

    Transformer Neutral Grounding

    Should the neutral of the transformer be provided with separate ground rod or can it be interconnected with earth bar which also connects the transformer frame and other equipment frame grounding. Is it correct as per the European standards? ( See the attachment)

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