The key thing about toroid transformers is not to create a shorted turn by mistake with the mounting hardware - should the mounting bolt for instance touch the lid of the case, huge currents can flow through the case metalwork which then acts as a shorting turn on the transformer. Its a good idea to place an insulating cap on the mounting bolt, or insulation on the inside of the lid, if space is tight around a toroidal mains transformer.
You don't want a mains transformer coming adrift during transit, plastic fittings are asking for trouble down the line when they have become brittle over time due to the heat.
You don't want a mains transformer coming adrift during transit, plastic fittings are asking for trouble down the line when they have become brittle over time due to the heat.
hi thank you very much for the very helpful advice
i see that my idea of using nylon strips in place of the bolt is not interesting Nylon is heat resistent very robust and not conductive
some nylon strips have a very high breaking load They seem just perfect to me Two placed at 180 degrees should be enough to keep the toroid in position
true Myabe using a screw insulator for the bolt on the bottom plate will solve any issue ? in this way the bolt will never touch the metal chassis
Nylon is indeed strong, but several decades down the line it may become brittle as the plasticisers leach out. I'd prefer metalwork for a heavy mains transformer as steel doesn't weaken with age and heat. Also nylon is a coverall term for many different polyamides with various properties, so actual behaviour of a particular part may be hard to ensure. For lighter stuff its perfectly fine, but several kg of mains transformer, use the mounting hardware it comes with, its known good. Things do get dropped in transit...
Also a heavy mains transformer will be mounted on a metal panel, and rough edges in the panel holes might cut through nylon straps if not carefully polished out.
Also a heavy mains transformer will be mounted on a metal panel, and rough edges in the panel holes might cut through nylon straps if not carefully polished out.
Thanks again But a nylon insulator can prevent the bolt from touching the metal chassis bottom This will eliminate electrical continuity
what about wrapping some teflon tape around the head of the bolt like they do for threaded pipes ? teflon is very heat resistant
what about wrapping some teflon tape around the head of the bolt like they do for threaded pipes ? teflon is very heat resistant