Electronics > Beginners
EI375 steel laminate primary transformer calculation
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gkmaia:
The data sheet is not really clear but seems both versions 120 and 240 can handle 50hz or 60hz.

But as per calculations, being 50hz means 1000 more turns. Total of 7000 turns instead of 6000

By calculations the original primary should have 3000 turns. If it is really 0.127 thick the coil former can hold up to 3400 turns and by the looks of it seems it is nearly there. If I modify it to 235v and use 0.07874 I can fit around 9000 turns, but I only need 7000.

How can you define if the size of the core may can handle 50hz?

The other thing I find interesting then from what you mentioned. My other 8012A Fluke runs with a step down transformer mounted inside it and it delivers 120@50hz and I have been using it extensively for quite a while.

gkmaia:
Jwillis I got a question about the laminates.

I got to isolate the steel laminates from each other. I've seen people suggesting to use clear spray paint.

But in fact any enamel paint will do the job. I think the only issue may be if the paint is metallic it will contain aluminium flakes and they are conductive. I imagine any paint that is not metallic will do.

Do you see any problem with that?

Jwillis:
Use a clear coat.Then your sure that theirs no other components in the paint that may cause issues.
The total turns turns works out to be 7207 240V at 50Hz
gkmaia:
Yes, will do.

Exactly. My excel gave same 7207 240 @ 50hz. Nice to see my excel works!

Thanks mate.

I've been trying to understand transformer windings for months and in a few posts you made everything easy & clear! Exactly what I needed!

If anyone out there need our calculations the final excel is attached.
gkmaia:

--- Quote from: Jwillis on August 05, 2019, 09:39:13 pm ---Use a clear coat.Then your sure that theirs no other components in the paint that may cause issues.
The total turns turns works out to be 7207 240V at 50Hz

--- End quote ---

Hey JWillis, finally got time to unwind the transformer. I got 4670 turns on the primary.

Our initial calculation gave 25 turns per volt.

But to run 120v with 4670 turns we would need 38.90 turns per volt.

I know more turns is better than less turns. Is there a reason why Fluke did more turns than necessary for the core?
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