High-voltage winding middle inlet wire structure K wire lead cold pressing technology

Abstract

The invention discloses a high-voltage winding middle inlet wire structure K wire lead cold pressing technology. To solve the problems that many defects exist and difficulty is large when a K wire is connected through flame welding, the technical scheme is put forward. According to the technical scheme, the technology adopted to connect the K wire comprises the steps of selecting a connecting pipe, improving the connecting pipe, preprocessing a cable and carrying out cold welding. By means of the technology, the connecting effect is good, the processing time is shortened, product quality is improved, the potential safety hazards brought by the defects of the original technology are eliminated, and meanwhile labor intensity is reduced.

Description

technical field

[0001] The invention relates to the field of construction, in particular to a cold-pressing process for K-wire lead wires of a high-voltage winding central wire-entry structure. Background technique

[0002] Nowadays, the high-voltage lead wire in the lead wire manufacturing adopts the cold pressure welding process, in which the winding head and the lead wire use double-head cold pressure welding, and the lead wire and the tap changer use single-head cold pressure welding. However, the high-voltage winding is an on-load tap-changing transformer with a middle incoming line, and the connection of its K line is still to be welded by flame.

[0003] The disadvantages of flame welding K wire are: (1) Copper is a metal and a good conductor of heat, so the turn insulation near the winding head will inevitably be damaged during welding, and the turn insulation damage at the upper and lower ends of the winding will still be damaged. May damage main insulation. (2) W...

Examples

Embodiment Construction

[0007] 1. The process of K-line connection: selection of connecting pipe→transformation of connecting pipe→cable pretreatment→cold crimping.

[0008] 2. The method of connecting the K line: (1) Select the type of connecting pipe according to the cross section of the K line. The sum of the cross sections of the two cables is equal to the sum of the internal cross sections of the connecting pipe to ensure matching.

[0009] (2) Ensure that the upper and lower K wires that need to be crimped can pass through the connecting pipe at the same time, and the crimped joints should be treated before insulation wrapping. First wrap the joints into an olive shape with aluminum foil, and then wrap them with metal wrinkles , to ensure that the shape of the electrode at the crimp is uniform and the contact resistivity is minimal.

[0010] (3) Process the connecting pipe: turn the two ends of the connecting pipe into bullnose so that the two ends are hemispherical after crimping to avoid sha...

technical field

[0001] The invention relates to the field of construction, in particular to a cold-pressing process for K-wire lead wires of a high-voltage winding central wire-entry structure. Background technique

[0002] Nowadays, the high-voltage lead wire in the lead wire manufacturing adopts the cold pressure welding process, in which the winding head and the lead wire use double-head cold pressure welding, and the lead wire and the tap changer use single-head cold pressure welding. However, the high-voltage winding is an on-load tap-changing transformer with a middle incoming line, and the connection of its K line is still to be welded by flame.

[0003] The disadvantages of flame welding K wire are: (1) Copper is a metal and a good conductor of heat, so the turn insulation near the winding head will inevitably be damaged during welding, and the turn insulation damage at the upper and lower ends of the winding will still be damaged. May damage main insulation. (2) W...

Examples

Embodiment Construction

[0007] 1. The process of K-line connection: selection of connecting pipe→transformation of connecting pipe→cable pretreatment→cold crimping.

[0008] 2. The method of connecting the K line: (1) Select the type of connecting pipe according to the cross section of the K line. The sum of the cross sections of the two cables is equal to the sum of the internal cross sections of the connecting pipe to ensure matching.

[0009] (2) Ensure that the upper and lower K wires that need to be crimped can pass through the connecting pipe at the same time, and the crimped joints should be treated before insulation wrapping. First wrap the joints into an olive shape with aluminum foil, and then wrap them with metal wrinkles , to ensure that the shape of the electrode at the crimp is uniform and the contact resistivity is minimal.

[0010] (3) Process the connecting pipe: turn the two ends of the connecting pipe into bullnose so that the two ends are hemispherical after crimping to avoid sha...