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Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
All,
I now have a Microsim simulation running, which reflects the behavior of a non-linear core. I want to use this to design a current transformer.
This transformer has a centertapped secondary, whereas the primary is just a conductor passed through the center of the toroid core. Getting close to unity coupling between the 2 secondary windings seems probable, but what about the coupling from primary to secondaries?
Intuitively, it appears as unlikely that this coupling can become particularly high.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Yes, the coupling between primary and secondaries depends on the permeability of the core, because the core will attract flux from the primary into itself. As a very rough estimate, if the permeability was 1000, the coupling would be 0.999. I think.
Registered Member #29
Joined: Fri Feb 03 2006, 09:00AM
Location: Hasselt, Belgium
Posts: 500
Keep in mind also that coupling will drop as the core saturates. Coupling is very geometry dependent, so it's difficult to answer your question in a specific way... Certainly, multifilar windings enhance coupling. It is relatively easy to deduce from measurements, tho'...
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Current transformers
