Abstract
Ethylene-propylene-diene terpolymer (EPDM) is widely used in HVDC cable accessories. However, the mismatch of DC conductivity between EPDM and cross-linked polyethylene (XLPE), and the effect of space charge accumulation at different insulating interfaces, will distort the electric field distribution and seriously affect the performance of insulating material. In this paper, EPDM was developed for ±535 kV HVDC cable accessories, and the conductivity, XLPE/EPDM space charge distribution and DC breakdown electric field were tested respectively. The electric field distribution of cable accessories was calculated by COMSOL analysis software. It is shown that electric field of the stress cone is far less than the DC breakdown electric field when the EPDM conductivity is close to XLPE; Furthermore, there is a small amount of space charge accumulation at XLPE/EPDM interface and in XLPE, but little space charge in EPDM. As a consequence, the research will make a potential application for ±535 kV HVDC cable accessories.
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