There are four measures for energy saving of transformers to choose from: reducing no-load loss, reducing load loss, reducing other components, and utilizing the working characteristics of working machinery to reduce loss.

1. Reduce no-load loss

(1) Use silicon steel sheets or amorphous alloy sheets with excellent performance, and adopt stepped seams.

(2) Improve the core structure and process to reduce the process coefficient.

(3) Do not apply an iron yoke, do not paint the silicon steel sheets, and ensure that the shear burr is controlled below 0.02mm.

II. Reduce load loss

(1) Use oxygen-free copper rod drawn wires with higher conductivity than electrolytic copper to improve the conductivity coefficient.

(2) Appropriately reduce the current density, improve the insulation structure, adopt half-oil ducts, prefabricated insulation parts, complete transposition of windings, overall winding encapsulation, self-adhesive wires, and self-adhesive paper, reduce the insulation volume, increase the winding filling factor, decrease the winding size, and adopt optimized design.

III. Reduce wear and tear on other components

(1) Improve the core structure, control the winding leakage flux in the design, and adjust the ampere-turn balance to reduce the stray losses of structural components such as the oil tank.

(2) Replace tubular radiators with corrugated oil tanks, plate radiators, and heat pipes, and substitute old-fashioned radiators with new-style radiators to enhance heat dissipation efficiency.

(3) Adopt reinforced plastic fans to improve efficiency and reduce noise.

(4) Adopt magnetic shielding or electrical shielding to reduce stray loss in the oil tank, and use non-magnetic materials as binding elements or magnetic flux separators to minimize stray loss.

4. Reduce losses by utilizing the operational characteristics of working machinery. If the capacity changes synchronously with the transformer load, eliminating or reducing the phenomenon of “a big horse pulling a small cart” can reduce losses. Due to load variations, the voltage of the working machinery fluctuates, often causing the machinery to deviate from its optimal operating range. If the voltage is adjusted according to load changes, keeping the working machinery near its optimal efficiency, maintaining a balance in three-phase current, and eliminating or reducing harmonics, energy consumption can be reduced