Electrical stress control hot melting composition and control element provided with hot melting interface

Abstract

The invention discloses electrical stress control hot melting composition which comprises components by weight as follows: 100 parts of matrix resin, 5-20 parts of tackifying resin, 40-120 parts of filler with high dielectric constant, 1-30 pats of conductive filler and 1-3 parts of an antioxidant. The invention further discloses an electrical stress control element provided with a hot melting interface. An electrical stress control tube is formed when the hot melting composition is composited with the inner wall of a heat shrink tubing, an electrical stress control tape is formed when the hot melting composition is composited with a base band, and the thickness of the hot melting composition interface layer is in a range from 5 mu m to 5 mm.

Description

technical field [0001] The invention belongs to the field of polymer materials in the heat-shrinkable cable accessories industry, and relates to: a high dielectric constant and low dielectric loss electric stress control hot-melt composition formulation technology, and an electric stress control tube or control belt with a hot-melt interface. Background technique [0002] Cable accessories used in medium and high voltage transmission and transformation grid projects, such as cable terminal joints and cable intermediate joints, have severe electric field distortion and electrical stress at the cut-off of the outer shielding layer of these joints and the cut-off of the terminal insulation layer. Concentration problems become the main factors that reduce the operational reliability and service life of cable accessories. Therefore, it is necessary to take control measures for electric stress dispersion and electric field intensity weakening on the cable accessories of medium and...

AI Technical Summary

Problems solved by technology

[0010] However, the reliability of the current "control tube and control strip" electrical stress control technology is still unsatisfactory. Although rubber, plastic and plasticine solid materials have a certain degree of elasticity, plasticity and even viscosity, their plastic deformation is still "rigid" when measured by the micron-level mesoscopic scale of air gap sealing, especially in the installation process, which requires multiple windings , repeated heating and shrinkage, complex installation process, and the influence of factors such as the size, roughness, and hardness of the electric stress control tube and the control belt itself, the air gap sealing requirements of the micron-level mesoscale cannot be met, and it is easy to cause damage during operation. The accumulation or even expansion of the air gap, the phenomenon of large partial discharge still exists, and the expected reliability of the operation of the cable accessories cannot be achieved, and the engineering installation cost is high

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