Model selection method and device of coating silicone grease/silicone oil for cable accessory installation

Abstract

The invention discloses a model selection method and device of coating silicone grease / silicone oil for cable accessory installation. The model selection method of the coating silicone grease / siliconeoil for cable accessory installation comprises the follows five detection links such as: a breakdown characteristic test of a composite interface composed of a rubber material coated with the silicone grease / silicone oil and the main insulation cross-linked polyethylene (XLPE) of the cable body after wetted and a comparison with the interface breakdown voltage when not wetted, an observation of surface microscopic morphology and molecular group changes after aging of the silicone grease / silicone oil, and the testing of interface electrical strength, mechanical properties and gel content afteraccelerated aging of the rubber material coated with the silicone grease / silicone oil in an environment where long-term operation of cable accessories is simulated. In the implementation process of the invention, the performance of the silicone grease / silicone oil is tested mainly from two aspects of the properties of the silicone grease / silicone oil itself and the swelling effect of the siliconegrease / silicone oil on the rubber material under the combined action of corona and heat, which can select the excellent silicone grease / silicone oil that can be used for the cable accessory installation, thereby reducing the failure rate of the accessory composite insulation interface.

Description

technical field [0001] The invention belongs to the field of cable accessory testing, and relates to a type selection method and device for coating silicone grease / silicone oil for installing cable accessories. Background technique [0002] Inside the cable accessories, there is a composite interface formed by the main cable insulation and accessory insulation and the phenomenon of electric field stress concentration, which is a weak link in the cable line and a typical part prone to failure. A large number of fault statistics of cable accessories show that the compound interface discharge and the deterioration of rubber insulation performance in the accessories are one of the main reasons for the failure of the accessories. Field-installed cable accessories are coated with silicone grease on the composite insulation interface of the accessory to improve lubrication and sealing performance during installation. [0003] During the long-term operation of cable accessories, th...

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Problems solved by technology

However, there are various types of silicone grease on the market, and the technical specifications and standards for performance testing of silicone grease coating for cable accessories are not yet mature, and there is no simple and effective selection method for silicone grease / silicone oil

On the other hand, most of the existing corona aging related experiments use an open multi-needle electrode system. The corona discharge formed by the needle tip makes a large number of high-energy particles injected into the position pointed by the needle tip, which cannot simulate the corona discharge on the actual cable accessory interface. Happening

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