The connection and fixation of insulation structural components improve the comprehensive distribution uniformity of transformer electric field, reduce electric field concentration, and eliminate the hidden dangers of partial discharge.

Non adhesive insulation paper screw is an important component used for connecting and fixing key insulation structural components of ultra-high and extra high voltage transformers. The ultra thick insulation paper board without any adhesive is used as the substrate, which improves the comprehensive distribution uniformity of the electric field in the transformer, reduces the concentration of the electric field, eliminates the hidden danger of partial discharge, increases the safety factor, and effectively solves the connection and fixing problems of the outgoing insulation structure of the high-voltage winding of ultra-high and extra high voltage large capacity transformers.

Figure 2.4.1 Screw nut without adhesive insulating paper