Cable accessory branching fingerstall restoration method

Abstract

The invention discloses a cable accessory branching fingerstall restoration method, and the method comprises three steps: prefabricating an injection mold and a buckle-type insulating tube, which are corresponding in shape and size; enabling a broken protection sleeve to be sleeved by the insulating tube, and placing room temperature vulcanized rubber in a slot and a joint; enabling a broken cable accessory branching fingerstall to be wrapped by the prefabricated injection mold, injecting the room temperature vulcanized rubber, and dismounting the mold after solidification. The injection mold is also provided with a mold housing, a sealing weir, and a glue injection port. The cross section structure of the buckle-type insulating tube is shaped like any one of omega, C and G. The material of the room temperature vulcanized rubber is preferably consistent with the base material of the buckle-type insulating tube and the base material of the cable accessory branching fingerstall. The method does not need to cut off the power for overall replacement, is low in overall cost, enables a maintenance mode to be changed into industrialization, standardization and modularization, is simple in operation, saves time and labor, is high in speed, guarantees that the insulating level and the service life are not reduced, and enables the reliability to meet the quality requirements of six sigma.

Description

technical field [0001] The invention belongs to the field of design, manufacture, installation and maintenance of cable accessories, and in particular relates to an on-line repair method after a branch finger sleeve of a cable accessory is damaged, including an insulating sheath layer. Background technique [0002] With the high development of automation and informatization, the coverage of the transmission network is getting bigger and bigger, and it also puts forward higher and higher requirements for the reliability design of the power grid expansion and replacement. It can be said that it has entered the Six Sigma (6σ ) quality control era, the structural design, reliability design and installation and maintenance mode of traditional power grid equipment and its cable accessories still lag behind this requirement. [0003] For example, during the installation and maintenance of cable accessories, it was found that the factory-made cable accessory branch finger sleeves an...

AI Technical Summary

Problems solved by technology

Although the electrical stress control body of the damaged cable accessories can still work normally in a short period of time, if it is not repaired in time and effectively, the damaged parts of the cable accessories will be further expanded soon, and the electrical stress control ability of the cable accessories will be significantly reduced. Cable sheaths are prone to moisture ingress and accelerated weathering, a sharp drop in insulation level, and a significantly shortened service life, resulting in a reduction in the reliability of the overall power supply of the power grid, which may eventually randomly trigger events similar to the 2003 New York blackout in the United States and the Italian blackout. Even lead to domestic and international political, military, economic and disaster security issues

[0004] Since the easily damaged parts are on the branch and sheath tube of the cable accessories, the space there is limited and it is difficult to carry out more complicated maintenance operations. At present, only the method of wrapping with insulating tape is used, although this method can maintain normal power supply in a short time , but judging from the designed service life cycle, the possibility of random failure is still very high

Therefore, the current maintenance method to ensure reliability can only remove and replace the cable accessories as a whole, resulting in a large waste of resources, and the repair cycle is long, and the overall cost remains high

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