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Start up time for transformer how to overcome it?

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samuelr

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Hi

I have this small problem. I am using a 20kV transformer and not sure why this seems to require a start-up it might be to energize the coil.

The total time it takes is about 5ms. Which is too long for my application. Is there a way to reduce this start-sup time or at best remove it.

Attached is the scope image.



Samuel
 

Hi,

The time between input and output voltage should be low. Maybe some microseconds. The output waveform should follow the input waveform.

You start to measure far before the signal is at the transformer input.

Maybe you can use semiconductor switches instead of mechanical switches.
Also you might consider ti synchronizer to mains frequency.
Or you generate your own sine frequency...With known timing.

For further discussion you should provide a scope picture with input and output voltages...

Klaus
 

Hi Klaus,

Thanks for you reply. It might be the mechanical switch and this might be a "bounce" effect, actually the image is just on the secondary side of the transformer with no components attached to it. I was thinking it might be just an in-rush, but mechanical effect might be plausible as well I can do MOSFET swtich to confirm this.
 

That sure looks like contact bounce, and 5mS is also highly suggestive of contact bounce.

Agree with Klaus, electronic switching would be the solution.
How about a solid state relay ?
These once triggered on, stay on, until the next zero crossing even if the contacts bounce.
 

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