Preparation method of integrally prefabricated intermediate joint

Abstract

The invention relates to the technical field of accessories of crosslinked polyethylene insulated power cables, and discloses a preparation method of an integrally prefabricated intermediate joint. The method comprises the following steps: injecting semi-conductive rubber into a mold by using a rubber injection machine to prepare stress cones at two ends and a high-voltage shield in the middle, injecting the semi-conductive rubber into the mold by using the rubber injection machine to prepare a stress cone insulation shield, and finally injecting insulation rubber into the stress cone and theinsulation shield to prepare the intermediate joint. According to the method, the die assembly seam on insulation is avoided, the problem caused by the fact that the shielding layer is thin is solved,the insulation performance is well guaranteed and the service life is longer.

Description

technical field [0001] The invention relates to the technical field of accessories for cross-linked polyethylene insulated power cables, in particular to a method for preparing an integral prefabricated intermediate joint. Background technique [0002] China's electric power industry is developing rapidly. The installed capacity of power generation and annual power generation have ranked first in the world. The level of power equipment has been greatly improved. The number of large-capacity, high-parameter, and environmentally-friendly units has grown rapidly. The coverage and modernization of the power grid have continued. Improvement, China's electric power industry has entered a new development stage of large power grid, large generating units, west-to-east power transmission, north-south mutual aid, and national networking, and is moving towards a higher goal of high efficiency, environmental protection, safety, and economy. With the acceleration of urbanization construc...

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Problems solved by technology

[0006] Aiming at the deficiencies of the existing technology, the present invention provides a method for preparing an integral prefabricated intermediate joint, which solves the problem that the insulation shield of the product may be scratched to expose the insulation in the process of product installation in the prior art.

The insulation performance of the product is reduced, and even the product breaks down, and after the insulation injection molding of the intermediate joint, there will be a mold joint outside it, which must be polished, resulting in the insulation shielding being not round, and making the electric field distribution in the rubber part Problems of unevenness and deterioration of insulation performance

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