Abstract
Space Charge Behavior under Thermal Gradient in Cross-linked Polyethylene and Ethylene-Propylene Rubber
Highlights
High-voltage direct current (HVDC) and flexible AC have been adopted widely for longhaul bulk grid interconnections, urban grid decongestions, island electrification, and renewable integrations
Most of the extruded cable insulations today are based on cross-linked polyethylene (XLPE) and ethylene-propylene rubber (EPR).(3) Extruded HVDC cables today are based on modified XLPE
A parallel-plate PEA system was enhanced to facilitate space charge profiling on flat samples under a thermal gradient. Such capability makes it possible to characterize new extruded HVDC cable materials in the early development phase under most relevant testing conditions to HVDC cabling where thermal gradient-driven spatial variations of electromagnetic constitutive parameters of the cable dielectric could be reproduced at a lab scale for the generation and study of space charge
Summary
High-voltage direct current (HVDC) and flexible AC have been adopted widely for longhaul bulk grid interconnections, urban grid decongestions, island electrification, and renewable integrations. While mass-impregnated (MI) or oil-filled (OF) cables have achieved long proven service reliability, extruded HVDC cable insulation free from the environmental risk of oil leakage is preferred owing to the ease of manufacturing, maintenance, field deployment, and simplified accessory design and procurement. Space charge accumulation in DC cable insulation will result in local electric field enhancement and reduction in DC electric strength. This is especially significant during voltage polarity reversal (required for changing the direction of power flow) in line-commutated converter (LCC) systems. With the introduction of a voltage source converter (VSC)-based HVDC converter station where polarity reversal is not required, the use of the extruded DC cable based on XLPE has been increased rapidly due to the reduction in performance deterioration by space charge accumulation. With the growing demand for HVDC rating in both power and voltage as well as a new system topology in such multiterminal HVDC, further optimization of DC insulation is still greatly needed for enhanced performance and reliability
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