Hi guys,
I'm investigating a transformer failure. Apparently, the transformer got shot through electrically, primary to secondary.
The funny thing is, that when an even higher DC voltage than the value that was (probably) present on the transformer is applied onto the transformer, there is no problem, even for extended periods of time.
Is it possible, that when dealing with epoxy, a dielectric breakdown can occur at a lower voltage, provided that a high dV/dt pulse is applied (such as 50kV/us)?
If so, what parameter should I look out for in the material datasheet? Is there any non-experimental way to determine what kind of dV/dt will the material survive?
Thanks,
David