10-35KV cable intermediate connector cold shrink installation improvement technology

Abstract

The invention discloses a 10-35KV cable intermediate connector cold shrink installation improvement technology. Two layers of waterproof self-adhesive tapes are adopted to be wrapped outside the external surface of an external semi-conductive shielding layer and the external surface of the fracture of a cold shrink pipe, and the two layers of waterproof self-adhesive tapes are adhered together so that the great natural shrinkage characteristic of the cold shrink pipe can be utilized, the gap possibly existing between the cold shrink pipe and a cable can be completely sealed by the adhesion of the waterproof self-adhesive tapes, and thus the waterproof performance of a cable intermediate connector manufactured by the technology can be greatly enhanced; meanwhile, the transition gap between a connecting pipe and an insulting layer is reserved, and a semi-conductive adhesive tape is wound on the transition gap and an intermediate connecting pipe so that the problem of high concentration of the electric field of the connecting part of the insulating layer and the intermediate connecting pipe can be solved.

Description

technical field [0001] The invention relates to the technical field of electric power, in particular to an improved process for cold shrinking installation of intermediate joints of 10-35KV cables. Background technique [0002] As we all know, moisture and humidity are one of the most harmful factors to the insulation of cable accessories. Once they enter the interior, the insulation level will drop or even break down. The cable intermediate joint is the weak point of the entire cable, so the cable intermediate joint is very important for waterproofing. The requirements are higher; the current intermediate joint installation process mainly consists of heat shrinking process and cold shrinking process. The heat shrinking process requires the use of flames to bake the heat shrinkable tube, and it cannot be guaranteed that any position of the heat shrinkable tube is the same during the baking process. The heat shrinks evenly, so that the intermediate joint will shrink unevenly ...

AI Technical Summary

Problems solved by technology

[0002] As we all know, moisture and humidity are one of the most harmful factors to the insulation of cable accessories. Once they enter the interior, the insulation level will drop or even break down. The cable intermediate joint is the weak point of the entire cable, so the cable intermediate joint is very important for waterproofing. The requirements are higher; the current intermediate joint installation process mainly consists of heat shrinking process and cold shrinking process. The heat shrinking process requires the use of flames to bake the heat shrinkable tube, and it cannot be guaranteed that any position of the heat shrinkable tube is the same during the baking process. The heat shrinks evenly, so that the intermediate joint will shrink unevenly due to the heat shrinkable tube, leaving air bubbles or gaps in the tube, resulting in poor waterproof performance and poor insulation performance; the traditional cold shrinkable process uses cold shrinkable tubes to seal both ends of the cable joint , using the elastic compression force of the cold shrink tube to tightly seal with the outer surface of the outer semi-conductive shielding layer at the cable joint, but it is difficult to ensure that there are no gaps only by relying on the elastic compression force, even if the cold shrink tube is wrapped with a waterproof Tape, but as long as moisture and moisture can enter the outside of the cold shrink tube, it may enter the middle joint through the gap between the cold shrink tube and the outer semi-conductive shielding layer, causing the insulation level of the middle joint to drop or even break down

Moreover, since the insulating layer of the 10-35KV cable is relatively thick, a ladder structure will be formed between the intermediate connecting pipe and the insulating layer. This hierarchical structure will lead to the problem of high concentration of the electric field and bring safety hazards to the operation of the cable.