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US 4,287,545 AGranted
Differential transformer
OwnerFerdy Mayerinventor
Life of this patent
Estimating the term…
Abstract
For optimizing the manufacturing cost of the magnetic torus of a differential transformer, the volume is reduced in that the free volume of the central aperture is fully filled: only one turn for each primary conductor, the section of which is reduced, the adjacent parts of larger section forming heat sinks, the central part of the conductors having the form of circular sectors. An important saving is secured on the most expensive part of the relay.
Claims6
A differential current transformer for an electrical installation protecting device, comprising:
- a magnetic torus with at least two primary coils having the same number of turns, said magnetic torus including high permeability material, said primary coils being traversed by opposed mains currents, said magnetic torus further including a secondary coil;
- wherein each of said primary coils includes one turn;
- wherein each of said two primary coils has a thinner section in a portion of each of said coils located in a central aperture of said torus and each of said primary coils includes a larger section in portions adjacent to said thinner section;
- and
- wherein said larger sections of each of said primary coils form thermal masses in view of increasing the dissipation of heat generated in the thinner portion.
2 more elements
Dependencies are inferred from the claim text.