Magnetizing Current
The reactive component of no-load current establishing magnetic flux in the transformer core.
Magnetizing current is the reactive component of excitation current creating alternating flux in the core. Required to overcome magnetic circuit reluctance.
Predominantly sinusoidal below saturation, becomes non-sinusoidal with 3rd harmonic near saturation. Lags voltage ~90 degrees (no real power).
Depends on core material permeability, air gaps, flux density, turns. Typically 0.5-2% rated for power transformers, 1-5% for distribution.
QDTB designs cores for optimal magnetizing current through material selection, flux optimization, and precision assembly.
Related Products
Related Terms
Excitation Current
Current drawn by transformer primary when energized with no load, consisting of magnetizing and core-loss components.
Magnetic Core
The laminated silicon steel assembly providing a low-reluctance path for magnetic flux, backbone of transformer operation.
Core Loss
Power dissipated in the transformer magnetic core due to hysteresis and eddy currents, also called iron loss or no-load loss.
Harmonics
Integer multiples of fundamental frequency from non-linear loads, causing increased transformer losses and overheating.
More Terms Starting with “M”
Magnetic Core
The laminated silicon steel assembly providing a low-reluctance path for magnetic flux, backbone of transformer operation.
Marshalling Box
External enclosure housing transformer control wiring, terminals, and auxiliary circuits for substation connection.
Moisture Content
The amount of water in transformer oil and solid insulation, critical for dielectric strength and insulation life.
Magnetic Flux
The total magnetic field passing through the transformer core cross-section, fundamental to electromagnetic energy transfer.
More in “Electrical Fundamentals”
Apparent Power (kVA)
The total power in an AC circuit combining real (active) and reactive power, measured in kilovolt-amperes (kVA).
Eddy Current
Circulating currents induced in conductive materials by changing magnetic fields, causing energy losses in transformers.
EMF (Electromotive Force)
The voltage generated by electromagnetic induction in a transformer winding, proportional to flux change and turns.
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