What is a Core?
Overview:
The core is a fundamental component of a electric transformer, consisting of core laminations, insulation parts, and structural components. The core itself is made of magnetic steel strips with very high magnetic permeability. To ensure that different windings can induce voltages proportional to the number of turns, the magnetic flux linking the two windings must be equal. This requires the core to be made from materials with high magnetic permeability, ensuring that all magnetic flux links with the core and both windings while minimizing the magnetic flux that links with only one winding.
The core laminations are made by stacking or winding electrical magnetic steel strips. The structural components of the core mainly consist of clamping pieces, foot pads, support plates, tension bands, tension bolts, and rivets. These structural components ensure that the laminations are adequately compressed, forming a complete and sturdy core structure. Insulation parts are present between the laminations and the clamping pieces, foot pads, support plates, tension bands, and tension plates. The grounding lead from the core laminations is connected to the clamping piece or reliably grounded externally through the oil tank, and multiple grounding points are not allowed on the core. In large transformers, the lower clamping piece of the core is positioned using locating pins from the oil tank, while the upper part of the core has positioning components on the support plate that align with the oil tank for proper placement.
