Influence of Radiation on the Dielectric Properties of XLPE Based Insulation Systems

Abstract

Influence of Radiation on the Dielectric Properties of XLPE Based Insulation SystemsThe paper discusses the possibilities of acquiring and processing the dielectric data in the range of very low frequency (VLF) and also design and construction of an impedance analyzer for measurements in this frequency range. The impedance measurements in the VLF range were used for investigation of the influence of radiation on the cross-linked polyethylene cable dielectric. An expressive β-type relaxation process was found in this type of cable. Most of the dielectric response parameters of the process depend significantly on the absorbed dose of radiation. The analysis of the process parameters showed that the most probable reason of the structural changes in cross-linked polyethylene was additional cross-linking. The results also proved that the impedance measurements in the VLF range could be effectively used in practice for estimation of the absorbed dose in the cross-linked polyethylene cables stressed by radiation.t data only. In order to identify or classify motion, data processing in real time is needed.

An EXPERIMENTAL STUDY ON DIELECTRIC PARAMETERS OF XLPE INSULATED HIGH VOLTAGE CABLES UNDER DIFFERENT OPERATING CONDITIONS

“…Measuring tan δ in MV cables can be done using various techniques. One method involves using very low frequencies, typically in the range of 0.001Hz to 1Hz ( Hou et al, 2023;Morsalin et al, 2019;Ďurman & Lelák, 2010;Hvidsten et al, 1990). However, this method takes time due to the lengthy measurement period, and low frequencies can lead to additional polarization losses in the dielectric material.…”

Effects of electrical aging on the structural and physicochemical properties of crosslinked polyethylene (XLPE) cable insulation material

“…Cross linked polyethylene (XLPE) is the most widely used materials in MV cable industry [3] because it possesses many advantages such as high dielectric strength, low dielectric permittivity and loss factor, good dimensional stability, excellent resistance to solvents, chemicals, and oxidative species, and superior thermo-mechanical behavior [4]. Nevertheless, XLPE cable can be subjected to highly erosive and extreme thermal, mechanical, electrical, and environmental effects, which lead to forming irreversible structural damages yielding significant reduction in cable service life [5]. It is well established that the effects of environmental and electrical constraints are mainly responsible for the degradation of XLPE insulation and cable rupture [6].…”

Ultraviolet radiation aging impact on physicochemical properties of crosslinked polyethylene cable insulation

“…However, under the service conditions, XLPE insulations may undergo irreversible changes after their exposition to multiple effects of stressing factors such as temperature, pollution, humidity, and irradiation exposure to sunlight or ionizing rays . The stressing factors lead to the insulation properties degradation and a significant reduction in the effective operation life of the cables . Among these stressing factors, it is well established that radiation effect is one of the most deleterious processes by which accelerated aging occurs and cause degradation of XLPE insulation.…”