Cross-linked polyethylene insulated cable by-product migration collection testing device

Abstract

The invention relates to a cross-linked polyethylene insulated cable by-product migration collection testing device. The device comprises a temperature detection part and a pressure detection part which are connected with a by-product migration collection part. The by-product migration collection part comprises a supporting cover plate and a sealing cover plate which are connected through an adjusting bolt; the adjusting bolt is connected with the supporting cover plate through a semi-transparent threaded hole; and the adjusting bolt is connected with the sealing cover plate through a full-transparent threaded hole. The method is directly applied to detection of a coaxial cable core of an XLPE insulated cable, a process that in a traditional method, a flat plate sample is used for completing testing and then is equivalent to an actual cable structure is omitted, efficiency is improved, and result errors caused by an inaccurate equivalent process are avoided.

Description

technical field [0001] The invention relates to a technology in the field of power cable performance testing, in particular to a cross-linked polyethylene (XLPE) insulated cable by-product migration collection test device. Background technique [0002] XLPE insulated cables have the characteristics of environmental friendliness, high operating temperature and large transmission capacity. Compared with traditional oil-filled cables and oil-paper insulated cables, they have obvious advantages and play a key role in domestic and foreign power construction. In industrial applications, the raw material of the insulating layer of XLPE insulated cables is linear low-density polyethylene (LDPE), in which a certain amount of dicumyl peroxide (DCP) is added in proportion as a crosslinking agent, and DCP occurs under certain temperature conditions. Decomposition induces the cross-linking reaction of linear LDPE molecules, thereby transforming into XLPE with a network-like macromolecula...

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Problems solved by technology

Existing XLPE insulated cables, especially high-voltage DC cables, are only researched and tested for by-products in the process of research and development and batch application. The reason is that slicing is the most convenient way to obtain XPE samples, but it also faces relatively difficult The biggest disadvantage is that the by-products exist as small molecules in XLPE. Affected by the external temperature and air composition, small by-product molecules will diffuse from places with high concentrations to places with low concentrations and the air outside XLPE. However, the specific surface area of ​​the sheet sample is too large, and the diffusion direction of by-products in the sheet sample is only perpendicular to the surface of the sheet, so the research results obtained can only obtain theoretical approximate laws, and XLPE insulated cables for real engineering applications The insulating structure is a hollow cylindrical structure, and the direction of diffusion of byproducts in the hollow cylindrical shape includes several different directions such as radially outward, radially inward, and axially, and the cylindrical insulating structure will be real It reflects the temperature gradient of the cable body. The above factors have an important impact on the study of the real diffusion law of the by-products in the real cable. Therefore, it is necessary to develop a device that can truly simulate the diffusion process of the by-products inside the real cable to assist in the research of related topics.

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