1. Measures to reduce no-load losses

(1) Select high-quality high magnetic conductivity cold-rolled silicon rigid sheets;  

(2) The iron core is sheared along the longitudinal and transverse shear lines, with burrs ≤ 0  02mm; 

(3) The iron core is made of fully inclined seams, multi-level stepped seams, without punching, and adopts the non overlapping yoke process;  

(4) The iron yoke is a "D" - shaped yoke, which reduces the length and weight of the magnetic circuit, effectively reducing no-load losses.  

2.Measures to reduce load loss

(1) Select high-quality oxygen free copper electromagnetic wire;  

(2) The coil is wound on a dedicated axis and amplitude tensioning device to ensure that the size meets the design requirements of the drawing;  

(3) When the low-voltage coil is a single helix, the "242" transposition is used, with a 10% delay in transposition at 1/4 and a 10% advance transposition at 3/4 to reduce stray losses;  

(4) The voltage regulating coil adopts a layered coil with a small amplitude, which effectively reduces resistance loss.  

3.Low Noise Measures

(1) Reduce the working magnetic flux density of the iron core appropriately (B ≤ 1.7T);  

(2) The joint of the iron core adopts a multi-level stepped joint;  

(3) The binding of the iron core is carried out using a specialized binding fixture, which reduces the magnetic hysteresis and amplitude of the iron core by keeping the force between the iron chips at (1.5-2kg/cm2);  

(4) Thickened insulation between the iron core and the clamps, pads, top beams, and side beams to increase the buffer zone for vibration:

(5) A 20mm thick oil resistant rubber plate with elastic buffering is used between the body and the fuel tank;  

(6) A 3mm thick cardboard enclosure device is installed around the inner wall of the fuel tank.  

4.Low Level Discharge Measures

(1) The high-voltage coil adopts an internal screen type instead of a correction type, which can reduce welding heads and lower partial discharge;  

(2) High voltage lead connectors use cold pressed connectors with air holes to allow air bubbles to escape during the cold pressing process. High voltage leads are covered with copper or aluminum foil;  

(3) Remove burrs and rounded corners from insulation pads and coil supports, and perform pre densification treatment;  

(4) Wrap paper, coil winding, and body assembly to prevent dust from entering;  

(5) Coil phase separation kit, the assembled coil is subjected to a vacuum constant pressure drying before the kit is installed, and after the kit is installed, the body is subjected to a second kerosene vapor phase drying;  

(6) The transformer coil adopts vacuum oil injection to prevent the presence of bubbles.  

5. Measures for fully sealed non hanging core structure

(1) The internal fasteners are all anti loosening structures. Each phase of the body is equipped with 6 nail bolts, with an additional one on each side (for phases A and C, a total of 20 nail bolts are used to tighten the body);  

(2) The six sided rigid positioning between the body and the fuel tank enables the body to withstand impact tests under various transportation conditions without displacement;  

(3) Submit the product transportation to a professional transportation company, install a pressure gauge during oil filling transportation, and maintain the internal pressure of the transformer at a constant positive pressure;  

6. Measures for leak free structures

(1) All sealing surfaces are machined to ensure their flatness;  

(2) Adopting a "0" type sealed overall structure;

(3) Acrylic rubber is used as the sealing element instead of nitrile rubber for ozone resistance, high temperature resistance and aging resistance;  

(4) The box is subjected to overall shot blasting paint, thoroughly removing sharp corners, burrs, and welding slag during the processing, and enhancing the adhesion of the paint;  

(5) The welding of the box edge and the forming welding of the fuel tank are carried out on the platform

7. Measures to resist short circuits

(1) Low voltage coils and voltage regulating coils use cardboard tubes as the skeleton, while high, medium, and low voltage coils use internal and external braces;  

(2) When winding high, medium, and low voltage coils, a dedicated shaft and spoke tensioning device is used to ensure that the winding is not loose;  

(3) The axial direction of the coil is reliably tied with interlocking "8" - shaped compression bands;  

(4) Coil phase separation kit, using equal pressure tooling before the kit to achieve equal pressure, equal height, and constant pressure drying;  

(5) Coil set, the inner coil iron core is tightly supported with braces without leaving any gaps, without breaking or breaking.