Re: [CAD_CAM_EDM_DRO] Transformer Soft Start

tiffyted wrote:

>Can anyone in this group advise me on a suitable circuit for soft
>starting a 230v primary, 40v secondary 1000VA toriordal transformer.

Jon Elson Replied:

I think you have something serious wrong, here. I don't think soft start
will help you.....

Thanks for the reply Jon,

The transformer is 230v only primary and 2 x 40v 12.5A secondary. As
supplied by RS. It currently is not connected to any rectification circuit
and the secondary windings are open circuit.

I have checked the data sheet which indicates the normal running current
would be 4.34A. However, there is a paragraph that states the start current
can momentarily be as much as 67 times this, which would blow the fuse. This
is what led me to assume I needed a soft start system.

Les Newell has suggested that I use a surge arrester. I think if they are
not too pricey I'll get one to try. If it works Ok I'll let you all know. If
not I'll have to look into it a bit deeper.

Thanks again to all for their replies.