Method and device for testing degassing degree of crosslinked polyethylene alternating-current power cable

Abstract

The invention relates to a method and device for testing the degassing degree of a crosslinked polyethylene alternating current power cable degassing degree. The method comprises the following steps:performing space charge measurement on a to-be-measured cable sample; calculating the average space charge density of the specified position of the cable sample to be measured; judging the degassing degree according to the comparison result of the average space charge density of the designated position and the average space charge density threshold value of the same type of products; the device comprises a charge measurement module, an average space charge density calculation module and a crosslinked polyethylene alternating current power cable degassing degree judgment module. The degassing degree of the XLPE alternating current power cable is detected by adopting an electroacoustic pulse method, the space charge density caused by crosslinking by-product residues is measured microscopically by applying a PEA method, and different types of cables of different suppliers are distinguished macroscopically through different probability distribution. Potential safety hazards that the service life of the cable is short and expected due to insufficient degassing time can be prevented, and safe and reliable operation of a power grid is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of power cables, in particular to a method for testing the degassing degree of a cross-linked polyethylene AC power cable and a device thereof. Background technique [0002] Cross-linked polyethylene (XLPE) material has excellent thermal, mechanical and insulating properties, and has been widely used as the main insulation material of power cables. XLPE is obtained by the cross-linking reaction of polyethylene material under the action of dicumyl peroxide (DCP). DCP itself will generate by-products during the cross-linking process. The main components are α-methylstyrene, acetophenone and cumyl alcohol, all of which contain polar groups. The DCP by-products trapped in XLPE will reduce the mechanical and insulating properties of XLPE, shorten the service life of power cables, and thus bring hidden dangers to the safe operation of the power grid. Therefore, the XLPE power cable production process must have s...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, propose a method and device for testing the degassing degree of XLPE AC power cables, and solve the problem of effective detection of the degassing degree of XLPE AC power cables

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