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
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
