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FOCUS THREAD: CDV-700 ENi brand HV Transformer info

 

A place to measure, Eni HV transformers and share that information.

It's?a FOCUS THREAD, so stay focused on this subject within this thread.

Geo
 

Electro-Neutronics inc (ENi) CDV-700 HV transformer failure modes and other data:
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Had to measure the resistance of the secondary for an overseas friend?yesterday, 3730 Ohms from memory.
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Electro-Neutronics inc (ENi) CDV-700 HV transformer failure modes and other data:

Geo: Measured resistance of a good secondary winding, 3730 Ohms.

Per, LA9ZEA from Norway had a failed secondary recently, he tried to take the transformer apart, but this one was potted in shellac, so that was a no-go. I asked him to micrometer read the diameter of the wire for our archives here's his reply:
George
With the micrometer I have it was 0.1mm
Its really not easy to see and to move since its embedded with lackeur. Its really delicate, and I have over the last few years "lost" my youth vision and have to rely on glasses and good lighting....its the thin wire all the way down to the post.

Thanks for that information Per!

With the resistance and diameter we can roughly figure the length of the secondary wire. Soon I'll do an inductance reading for a third data point to calculate the number of turns.

INDUCTANCE- Very careful inductance measurements were carried out on a few transformer secondaries, with the rectifier diodes removed.
Sample 1 was tested to be 65.4 Henries. Higher than I thought.
Sample 2 was 53.4 Henries,
Next were these values:96H, 77H, 51H, 58H, 65H.

No two were alike. Different styles were noted, at least 3 completely different versions in this small sampling.
so take any number between 50H and 100H and that's probably "good enough".? Geo



Geo
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