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B L – leakage flux; magnetic field lines which don't follow complete magnetic circuit L – average length of the magnetic circuit. It is the sum of the length L core in the iron core pieces and the length L gap in the air gaps G. A magnetic circuit is made up of one or more closed loop paths containing a magnetic flux.
The magnetic circuit's flux that does not interlink both windings is the leakage flux corresponding to primary leakage inductance L P σ and secondary leakage inductance L S σ. Referring to Fig. 1, these leakage inductances are defined in terms of transformer winding open-circuit inductances and associated coupling coefficient or coupling ...
Leakage may also mean an unwanted transfer of energy from one circuit to another. For example, magnetic lines of flux will not be entirely confined within the core of a power transformer; another circuit may couple to the transformer and receive some leaked energy at the frequency of the electric mains, which will cause audible hum in an audio application.
Magnetic flux leakage (TFI or Transverse Field Inspection technology) is a magnetic method of nondestructive testing to detect corrosion and pitting in steel structures, for instance: pipelines and storage tanks.
Thus, for a typical inductance (a coil of conducting wire), the flux linkage is equivalent to magnetic flux, which is the total magnetic field passing through the surface (i.e., normal to that surface) formed by a closed conducting loop coil and is determined by the number of turns in the coil and the magnetic field, i.e.,
the magnetic circuit is a single loop of core material, possibly broken by a few air gaps; the core has roughly the same cross-sectional area throughout its length; any air gaps between sections of core material are not large compared with the cross-sectional dimensions of the core; there is negligible leakage flux.
B – magnetic field in the core will be approximately constant across any cross section B F – "fringing fields". In the gaps G the magnetic field lines "bulge" out, so the field strength is less than in the core: B F < B B L – leakage flux; magnetic field lines which don't follow complete magnetic circuit
Equivalent circuit elements , have physical meaning, modelling respectively magnetic reluctances of coupling paths and magnetic reluctances of leakage paths. For example, electric currents flowing through these elements correspond to coupling and leakage magnetic fluxes. Ideal transformers normalize all self-inductances to 1 Henry to simplify ...