Timeline for How hot is too hot for a transformer?
Current License: CC BY-SA 4.0
23 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 31, 2021 at 15:58 | comment | added | carloc | And don't forget that as rule of thumb RMS current in the windings is roughly 1.8 times the average DC output of a full wave capacitive input rectifier. This is over three times the copper losses and temperature rise if this is your case | |
| Jan 31, 2021 at 15:36 | history | edited | ElectronSurf | CC BY-SA 4.0 |
deleted 4 characters in body
|
| Jan 29, 2021 at 8:19 | comment | added | Marko Buršič | Thank you for your vote. When you get a new one, ask the shop about the insulation class. Nominal flux density - it should be max 1.6T, but you would get even 1.9T on Ali, eBay, they are smaller and cheaper, but they heat even without load, they blow fuses, they produce higher harmonics,...Then as @rdtsc said, it shall be impregnated in vacuum and cured. This is where I order: tik-transformatorji.si/izdelek5.php , you can compare the weight (kg) Skupaj - means total weight VS. yours, to see if they were cheating on flux density. | |
| Jan 29, 2021 at 7:10 | vote | accept | ElectronSurf | ||
| S Jan 29, 2021 at 7:07 | history | suggested | Peter Mortensen | CC BY-SA 4.0 |
Copy edited (e.g. ref. <https://english.stackexchange.com/questions/15953> and <https://en.wiktionary.org/wiki/loose#Adjective>). [(its = possessive, it's = "it is" or "it has". See for example <https://www.youtube.com/watch?v=8Gv0H-vPoDc&t=1m20s> and <https://www.wikihow.com/Use-Its-and-It%27s>.)]
|
| Jan 29, 2021 at 6:58 | comment | added | Peter Mortensen | How did you measure the temperature? Where was the temperature measured? | |
| Jan 29, 2021 at 6:54 | review | Suggested edits | |||
| S Jan 29, 2021 at 7:07 | |||||
| Jan 29, 2021 at 0:00 | history | tweeted | twitter.com/StackElectronix/status/1354942410007175173 | ||
| Jan 28, 2021 at 23:47 | comment | added | Bob Jarvis - Слава Україні | If the magic smoke gets out, it was too hot. | |
| Jan 28, 2021 at 23:05 | comment | added | msouth | +1 for updating to tell us what the deal was. I am, like many people on here, always curious about "how the story ended". | |
| Jan 28, 2021 at 22:59 | comment | added | Harper - Reinstate Monica | The transformer's nameplate should state service current limits. If it doesn't have a nameplate it's not a real transformer, it's mystery meat. | |
| Jan 28, 2021 at 22:15 | comment | added | user73265 | And does it make a difference if they're in disguise? | |
| Jan 28, 2021 at 21:27 | history | edited | ElectronSurf | CC BY-SA 4.0 |
added 114 characters in body
|
| Jan 28, 2021 at 20:23 | history | became hot network question | |||
| Jan 28, 2021 at 19:53 | comment | added | Marko Buršič | @rdtsc That should be already done in the workshop, so it explains my comment on probably low quality built. | |
| Jan 28, 2021 at 13:00 | comment | added | rdtsc | To reduce noise, place in a bowl of varnish/conformal coating, place that in a vacuum chamber, pull vacuum for an hour, let air in slowly, remove xfmr, bake/cure dry. Note this may slightly worsen temperature issues, as the center will now be more physically insulated. | |
| Jan 28, 2021 at 12:50 | comment | added | ElectronSurf | @SteveSh It's a step down transformer working with 220V at 50Hz. for a linear regulator. the core is iron. | |
| Jan 28, 2021 at 12:48 | comment | added | SteveSh | The key here is what is the winding or core temperature. Also, what is the core material. Was any kind of thermal analysis done of this transformer? I agree that 55 deg C is not that hot, assuming a room temperature environment. The core/windings are probably 15 deg C or more hotter, so that would mean 70 deg C. If this thing is supposed to work in a 85 deg C environment, that wold push those internal temperatures up to 130 deg C, way too hot for reliable operation. Like I said earlier, we need more information. | |
| Jan 28, 2021 at 12:38 | answer | added | Marko Buršič | timeline score: 18 | |
| Jan 28, 2021 at 12:33 | comment | added | Marko Buršič | 55 deg is not that much, but it depends to the insulation class. Weezing noise is due to loose tight of lamination. Both phenomena together may also indicate a low quality product. | |
| Jan 28, 2021 at 12:31 | comment | added | SteveSh | What does this transformer do? Is it for a switch mode power supply? What frequency does it operate at? | |
| Jan 28, 2021 at 12:24 | answer | added | jwh20 | timeline score: 15 | |
| Jan 28, 2021 at 12:20 | history | asked | ElectronSurf | CC BY-SA 4.0 |