Double-capacity power transformer

Abstract

The invention relates to the technical field of transformers, particularly to a double-capacity transformer having a load capacity for short-time emergency treatment. Magnetic shields are arranged on the inner wall of an oil tank and a clamp of the transformer; a high-voltage winding and a medium-voltage winding of the transformer are both of an internal shield continuous structure; a low-voltagewinding is of a continuous structure; a tap-changing winding is of a double-helix type structure; a half-hard copper transposed conductor is adopted for the high-voltage winding; half-hard copper self-adhesive transposed conductors are adopted for the medium-voltage winding and the low-voltage winding; the current density of each winding is 1.7-2.2 A / mm<2>; the width of a conductor on the end part of each winding is 6-8.5 mm; the thickness of the magnetic shield is 10-25 mm; at least one axial oil passage is radially arranged in the high-voltage winding and the medium-voltage winding; and secondary struts are also arranged in the windings at the internal side. By using the double-capacity power transformer disclosed by the invention, the loss and the temperature rise of the transformer are reduced, the service life of the transformer is prolonged, the transformer has the 200%load capacity for the short-time emergency treatment, the flexibility of power grid dispatching is improved, and the safe operation of a power grid is guaranteed.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a double-capacity transformer with short-term emergency load capacity. Background technique [0002] During the operation of the power grid, sometimes the transformer fails due to external environmental damage or the transformer itself, and other transformers cannot bear the load of the faulty transformer, resulting in the immediate shutdown of the entire power grid, resulting in serious losses. If each transformer in the power grid can be made to have a greater overload capacity, then when one transformer is out of operation due to a fault, the other transformer can bear all the load of the faulty transformer in a short time, and the power grid can be maintained for a period of time. It can greatly improve the flexibility of power grid dispatching and reduce the failure loss of power grid operation transformers. Contents of the invention [0003] In view of the above pro...

AI Technical Summary

Problems solved by technology

[0002] During the operation of the power grid, sometimes the transformer fails and stops due to external environmental damage or the transformer itself, and other transformers cannot bear the load of the faulty transformer, causing the entire power grid to stop immediately and cause serious losses.

Images