a. Flare and form one end of the rivet. The flared thickness should be 2.3-3 mm, with a diameter of Φ13.5-14 mm. b. Place the processed silicon steel sheets onto the dedicated fixture for stacking. Trim the core laminations during the stacking process, ensure they are perpendicular to the base plane, and prevent any eccentricity. c. After the core stacking is complete and clamped tightly with a pressure plate, measure the stacking thickness to ensure it meets the drawing requirements. d. Fit the rivets with washers, insulating spacers, and insulating sleeves, then flare and form them. Ensure that the tightness of all installed rivets is consistent. Read More

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If there are only a few shorted laminations and the damage is not deep, a special scraper can be used to remove the adhering burrs, followed by applying varnish. Take this opportunity to remove all core bolts from the core limb and replace them with non-woven (glass fiber) bands for binding and clamping purposes. However, care must be taken to ensure the non-woven binding bands are not too thick, to avoid interfering with the winding installation. Generally, the thickness of the non-woven binding bands for distribution transformers should be kept between 1 to 2 mm. If necessary, multiple bands can be added to reduce the thickness of each individual band. Read More