{'fraction_non_alphanumeric': 0.03524804177545692, 'fraction_numerical': 0.014360313315926894, 'mean_word_length': 5.6695652173913045, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Investigation of space-charge build-up in materials for HVDC cable insulation in relationship with manufacturing, morphology and cross-linking by-products

Space charge accumulation in cross-linked polyethylene-based materials for high voltage direct current (HVDC) cable insulation is investigated. Samples molded from classical cross-linkable polyethylene pellets with and without nanoparticles are used. Curing conditions (160°C, 180°C and 200°C) and degassing are assessed in terms of morphology, cross-linking by-products and space charge accumulation under high dc field (50 kV/mm). The results are analyzed and cross-correlated in order to understand the observed space charge behaviors and to derive ways for optimizing materials and manufacturing processes.