Magnetic Core
The laminated silicon steel assembly providing a low-reluctance path for magnetic flux, backbone of transformer operation.
The magnetic core provides a low-reluctance path for flux linking primary and secondary windings. Constructed from thin laminations (0.23-0.35mm) of grain-oriented silicon steel, insulated to minimize eddy current losses.
Types: core-type (most common), shell-type (low-V/high-I), toroidal (small transformers). Modern step-lap joints reduce core loss 5-10% vs. overlap.
Materials: conventional M4/M5, Hi-B, domain-refined grades (15-30% lower loss each step). Amorphous cores offer 60-70% lower no-load loss.
QDTB uses premium grain-oriented steel with step-lap construction in all designs, optimizing for minimum core loss and magnetizing current.
Related Terms
Core Loss
Power dissipated in the transformer magnetic core due to hysteresis and eddy currents, also called iron loss or no-load loss.
Hysteresis Loss
Energy lost in core steel from repeated reversal of magnetic domains each AC cycle, a component of core loss.
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.
More Terms Starting with “M”
Magnetizing Current
The reactive component of no-load current establishing magnetic flux in the transformer core.
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 “Design & Engineering”
Altitude Derating
The reduction in transformer capacity and insulation performance required at high altitudes where air density is lower.
Cooling Class (ONAN/ONAF/ODAF)
Standardized codes describing transformer cooling methods: O=Oil, N=Natural, A=Air, F=Forced, D=Directed flow.
Faraday Shield
An electrostatic shield between transformer windings blocking capacitive coupling of high-frequency noise.
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