Abstract
High voltage direct current (HVDC) cable accessories are usually the weak link in the cable system for the electric field distribution is often extremely uneven, and it has a range of adverse effects in design and manufacture. In this paper, Ethylene-propylene-diene terpolymer (EPDM) was developed for ±525 kV HVDC cable accessories, and the conductivity, XLPE/EPDM interface charge behavior and breakdown strength were tested respectively. The electric field distribution of cable accessories was calculated by COMSOL analysis software. It is shown that the conductivity of EPDM is nonlinear with electric field, and it is possible to achieve the uniformity of electric field distribution by using a composite material with nonlinear conductive properties. Furthermore, the interfacial charge characteristics of XLPE/EPDM depend on the conductivity of EPDM. As a consequence, the research will make a potential application for ±525 kV HVDC cable accessories.
Highlights
In recent years, High voltage direct current (HVDC) transmission technology develops rapidly, voltage level and transmission capacity increase quickly
XLPE was designed for HVDC cable with voltage up to ±525 kV by Borealis (LS4258DCE), and Ethylene-propylene-diene terpolymer (EPDM) insulation material was developed by NARI Group
EPDM was connected to the high voltage electrode and XLPE was connected to the ground
Summary
HVDC transmission technology develops rapidly, voltage level and transmission capacity increase quickly. The cable accessories are usually the weak link in the cable system, and its own electric field intensity is far beyond the average value of the overall electric field intensity, even several times the average value, and the electric field distribution is often extremely uneven [2] It has a range of adverse effects in design and manufacture, which makes the importance and difficulty of insulation problems more and more obvious [3]. The second is to improve the electric field intensity distribution of cable terminals by using nonlinear composite materials, ABB adopts nonlinear resistive stress control technology, produced 525 kV extruded insulation DC cable terminal, which can satisfy the stability requirements of load cycle and transient process (lightning and operating pulse) under the condition of DC operation [5,6]. The stress cone simulation model of 525 kV was established by COMSOL Multiphysics, and the distribution of stress cone electric field was studied with different materials were used in the insulation part of stress cone
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