Oil-immersed type transformer non-end-insulation low-voltage foil-winding coil manufacturing technology

Abstract

The invention discloses an oil-immersed type transformer non-end-insulation low-voltage foil-winding coil manufacturing technology includes the steps of A), cutting out a copper foil or aluminum foil coil stock proper in length and width as well as a layer insulation DMD presoaking-cloth coil stock according to requirements; B), mounting and arranging the copper foil or aluminum foil coil stock as well as layer insulation DMD presoaking cloth on a foil winding machine according to the winding sequence; C), welding leading rows on the copper foil or the aluminum foil, and polishing and cleaning the welding positions; D), synchronously winding the copper foil or the aluminum foil as well as the layer insulation DMD presoaking-cloth coil stock; E), mounting a fixture on the wound coil and putting the coil into an oven for molding and curing according to technological requirements. The coil is packaged integrally after the coil winding technology is completed, and mechanical strength and short-circuit resistance strength of the coil are effectively improved. Meanwhile, the DMD presoaking cloth 0.25mm in thickness and better in performance is adopted as layer insulation in the coil structure, production processes are simplified, and reliability of the coil is improved.

Description

technical field [0001] The invention relates to a coil manufacturing process, in particular to a low-voltage foil-wound coil manufacturing process with endless insulation for an oil-immersed transformer. Background technique [0002] Distribution transformer refers to a static electrical device used in power distribution system to transform AC voltage and current according to the law of electromagnetic induction and transmit AC power. China's transformer products can generally be divided into UHV (750KV and above), ultra-high voltage (500KV) transformers, 220-110KV transformers, and 35KV and below transformers according to their voltage levels. Distribution transformers usually refer to power transformers operating in the distribution network with a voltage level of 10-35KV and a capacity of 6300KVA and below to directly supply power to end users. [0003] In the industry, the current production of 10~35kV oil-immersed distribution transformers, when the low-voltage coil is...

AI Technical Summary

Problems solved by technology

First of all, this increases the end insulation manufacturing process, and the insulation between the cable paper layers is relatively thin, which may be punctured by uneven or even burred foil materials. Secondly, after the low-voltage foil winding coil is wound, it is directly wrapped or wrapped with a high-voltage coil, not Form a complete foil-wound steel body structure