I remember (am I daydreaming?) seeing plastic casing on toroidal core (looks like two O-shaped caps). Can anybody suggest vendor? Do they sell these things? I need to have 10kV-rated insulation between core and winding. Any hint will be appreciated. Thanks Michael
Robison Plastics?
John
They are called "core caps". I have only seen them for really fat cores but you could call an engineer at your vendor.
-- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
Frerroxcube distributes nylon 'caps' for sizes of high-permeability-material toroids for the construction of CM chokes and coupling/measurement applications. Creepage to core is achieved with n-layer tape on the seam.
Panasonic, Tokin and a number of other SEAsian mfrs market encased cores for the same applications.
A 10kv 'book' rating is not likely achievable using commercially distributed materials, though demonstrated performance is possible.
Big question is why the big isolation requirement to the core on a toroid? As normally constructed, core insulation shows up twice between any two points of stress ( ~ single-fault immunity).
The bigger problem on toroids is winding-to-winding, where insulation layers may have to function in one layer.
A 10Kv isolation requirement is no joke for any small transformer structure, never mind toroids, where even simple layer insilation is a complicated matter.
RL
Even for a 5kV "book rating" I had to go to the pros. Aircraft suppliers in my case. Anything less won't do if you need cert. And be prepared for huge MOQ and/or big bucks.
[...]-- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.