Ferroresonant transfomers

[plumhumphrey]

We are looking for a transformer manufacturer who has experience with ferroresonant high voltage transformers design and manufacture. Outline Spec: input 115/230VAC, output 7.5kV, 30-40VA
Quantity: 2000 a year.

 

[bklauba]

That is a rather high voltage for a ferro. What can you tell me about:

1. The application

2. Environment

3. Duty Cycle

Ferros can be tailored to have an output that is at times called a "quality square wave", which is easily rectified into low-ripple DC.

BK

 

[fsmyth]

Sounds like a the transformer in a microwave oven.
<als>

 

[jraef]

I beleive that is the basic description of a Neon Sign Transformer. Joseph Sola of Sola Electric invented the ferroresonnant transformer, and they used to make Neon Sign Transformers back when I worked for them many years ago, but I think I heard they got out of it. Worth calling them for that qty however.

http://www.solaheviduty.com

"Our virtues and our failings are inseparable, like force and matter. When they separate, man is no more."
Nikola Tesla

 

[zeitghost]

Doesn't the "ferroresonant" term mean that these transformers are frequency dependent?

Many years ago I was on an Ampex VR2000 training course and the lecturer regaled us with the tale of a company in the UK who were recording programs for US consumption using 525/60Hz NTSC.

For some obscure reason the company decided that it would be a spiffingly good idea to feed the VR2000 with 60Hz instead of 50Hz (which is what we have in the UK).

Sadly the valves (vacuum tubes) in the machine were fed from a ferroresonant transformer designed for 50Hz (odd that).

So the heater voltage on 60Hz was now somewhat more than 6.3V.

Oooops, expensive things those valves & hard to find...