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Why should the dry power transformer core be grounded

When the dry power transformer is in normal operation, the core must have a reliable grounding. If there is no grounding, the suspension voltage of the core to the ground will cause the core to intermittently break through the discharge, and the core is grounded to eliminate the possibility of forming the core suspension potential.
Because the dry distribution transformer generates electric and magnetic fields during operation, the iron core and the iron member are at different positions of the electric field and the magnetic field. Due to the electromagnetic induction relationship, there is a voltage difference between the iron core and the iron member, and this voltage may cause A discharge occurs between the iron core and the iron member, causing the transformer to malfunction
However, when the iron core is grounded at two or more points, the uneven potential between the iron cores will form a circulation between the grounding points, causing the multi-point grounding heating fault of the iron core.
dry power transformer
The core grounding fault of the dry-type transformer will cause local overheating of the iron core. In severe cases, the local temperature rise of the iron core increases, the light gas moves, and even an accident that causes heavy gas action and tripping. The sintered local iron core forms a short circuit fault between the iron chips, which causes the iron loss to become large, which seriously affects the performance and normal operation of the transformer, and the iron core silicon steel sheet must be replaced for repair.
Therefore, the dry distribution transformer does not allow multi-point grounding to have only one ground and only one point.
ZTELEC manufactures environmentally friendly dry power transformers.

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