Last Updated on October 26, 2023 by Electricalvolt
Transformer is a static piece of equipment and it has primary and secondary winding. The low voltage winding has few turns of wire wound around the core. The high voltage winding has many turns of wire wound around the low voltage winding. This scheme of winding reduces the electric stress between the core and the winding.
Table of Contents
- Transformer Core
- How does core grounding protects the equipment?
- How to ground the core of large power transformer?
The transformer core is formed with thin sheets of laminated CRGO core. The laminated sheets provide a conductive path to the magnetic field, but on the other hand, it provides electrical insulation between the sheets. The laminated sheets have very low reluctance, and because of this, most of the flux pass through the core without leakage. The eddy current sets up in the transformer core because of the induced voltage in the core. The transformer is earthed to have a minimum resistance for fault current to pass to the ground.
In the case of a large rating transformer, the core of the transformer has multiple sections. The cooling ducts insulate the core sections. The core jumpers bond the core sections together and the final jumpers connection connects core sections to single point earth.
The heavy magnetic field develops at the time of charging, as a result, a high voltage develops because of capacitive coupling between winding and core. The voltage developed in the core discharge through the earth point of the core. The protection device operates in the event of a winding to core insulation failure. The core of the power transformer is grounded at a single earth point in order to avoid circulating current with multiple earthing of the core.
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