Transformer issue

--- Certainly not, but armed with the knowledge that the transformers will be surface mounted and soldered on a line using a high temp process I, for one, wouldn't be willing to skimp on wire and take a chance on losing my customers' good will if I were making the transformers.

What does surprise me though, is that you guys didn't get first articles up front and run them through the gamut to check the fallout.

About a million years ago I designed a small inverter for a client who was selling electroluminescent exit light signs, and the transformer wound up going to China for build.

They redesigned it using thicker and cheaper laminations, which resulted in higher power dissipation during normal use and shorter battery life in a "mains out" situation, but they got the order because my client could get them cheaper and they worked "well enough".

As I recall, because of energy wasted, in the long run the cost of ownership would have been less using the original transformer, but there ya go...

---

--- Well, of course we're not perfect, but we're pretty good.

Even after a horrible fuckup like Hubble, we fixed it and got back unbelievable pictures of things we'd never seen before.

Oh, and then we got to the moon and back...

And then there's Mars, and the intended collision with whatever that object was, but I digress...

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--- Thank you, Europe.

JF

Reply to
John Fields
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There is something unknown going on here because the transformer manufacturer has no fallout when they run the "same" temperature profile.

What makes you think we haven't? This isn't a new problem but is now getting some real attention.

Depends on who's paying what cost and whether they care.

...and that is relevent how? We'll get this problem fixed too. So what?

Indeed.

Indeed^2

Reply to
krw

One peroblem in the energy efficiency area is - someone with power to specify or design the transformer gets to care less about how much the cheaper transformer costs the one who purchases the product that it is in

- or the ones that the purchaser passes these costs onto. Furthermore, the increased energy cost of the cheaper transformer tends to take more than a year to outweigh the increase of cost of a more energy-efficient transformer.

And, not that an exit sign lamp inverter is the best example of increase of cost of ownership of a cheaper less-energy-efficient transformer, as opposed to ones in mains-powered transformers in power supplies that are mains-powered 24/7/365 minus power outages.

However, the cost does affect us. If such less-efficient cheaper transformers designed for short-term cost-effectiveness are used in police stations, public or otherwise-tax-subsidized schools, courthouses or other government buildings, buildings owned or rented by suppliers or retailers of things we use, or buildings owned or rented by insurance agencies or law firms that they use or experience being used against them, buildings used by accountant or financial service companies or banks used by us or ones whose products or services we buy or subsidize via taxes, then the cost of such energy inefficiency comes *largely to you and me*.

And even when less-energy-efficient products are purchased by less- educated or less-caring consumers, there is still the matter of bidding up prices of fuels, whatever the environmental impact is (debatable as to extent but not zero, including mercury pollution from coal burning as well as the fraction of AGW proposed by its proponents-of-existence-thereof to be "For Real"), and necessitating construction of politically-unpopular electric power plants and transmission lines. (Politicians in legislative branch of all levels of government like to find opportunity to horse-trade allowance of something "politically incorrect" in exchange for allowance of "pork to bring home", especially if they can cite "hiring count" of both as "jobs created".)

Though I digressed a bit, I hope I touched onto why there is at least a little responsibility for those designing or specifying transformers in areas where energy efficiency may be significant, to make them achieve greater energy-efficiency than that achieved by the design that minimizes the supplier immediate cost (neglecting paying increased electric bills of school/police/government/insurance/medical-customer, better able to neglect if offshore) of supplying the transformer that satisfies "The Requirements".

At this rate, I hope I can say why some laws get passed, especially in areas of energy-efficient-products and "corporate responsibility". As in "reasonably do "The Right Thing", lest falling short especially in a way popular to do so motivate law-making. (Law-making can get as ugly as making sausages.)

(Those having any power, even if only minimal, to affect law-making in areas where engineering has significance anywhere near or greater than "slightest significance", should consider their possible effects on lawmaker motivations...)

- Don Klipstein ( snipped-for-privacy@misty.com)

Reply to
Don Klipstein

Yeah, we're all going to lose sleep over the energy lost because of an audio transformer.

Reply to
krw

--
So... 

You're part of the problem.

JF
Reply to
John Fields

Do I ignore irrelevant energy loss? Sure. If you call that a problem, you're part of the real problem; watermelons.

Reply to
krw

They used shitty, single strength mag wire from an irreputable Chinese wanna be manufacturer.

If they are custom spun, have them use double strength or better mag wire. and even the non-"Nyleze" easily solderable stuff. Make them use the hard to solder stuff, and strip and tin the ends to be assembly ready.

THEN, single strength would work. But for cheap shit solderable Nyleze, it should be at least double strength and should be from a US wire maker.

It has NOTHING to do with the core. If there are shorted turns, THAT is the problem. This is true ESPECIALLY if there are any corners that the wire must be wound over. The core hub should be pre-wrapped with transformer tape.

And THAT is the rest of the story.

Reply to
Archimedes' Lever

Not if you are too stupid to observe the behavior and determine what is wrong. X-former maker using cheap, thinly insulated wire. Shorted turns. Pretty simple.

Also, unless they are being impregnated, the turns count can be a problem if too many turns are in one layer. High turns count windings REQUIRE layer by layer segregation of the winding to keep early turns away from later turns, which can violate insulation resistance capacity.

If it is more than 150 turns, the winding should be layered at no more than about 130 per layer. Evenly metered is the right way, but as long as it is less than 130 turn it should be OK.

The volts per turn should be below 2 volts as well. Better to be 1 or

1.5 at most.

Add up the turns, and examine the wire insulation spec, and see why high turns count windings need to be constructed carefully.

I absolutely despise helping you, fucktard.

Reply to
Archimedes' Lever

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