Open AccessMobility‐limited charge injection in cross‐linked polyethylene under extra high electric field
Author(s) -
Zhu Xi,
Yin Yi,
Peng Suman,
Wu Jiandong,
Li Wenpeng,
Chen Xin,
Li Zhenyu,
Guan Jianxin
Publication year - 2021
Publication title -
high voltage
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.732
H-Index - 20
ISSN - 2397-7264
DOI - 10.1049/hve2.12039
Subject(s) - electric field , space charge , charge (physics) , dielectric , materials science , drift current , condensed matter physics , electric charge , physics , atomic physics , electron , optoelectronics , quantum mechanics
Abstract In this study, characteristics of charge injection under extra high electric field (above 100 kV/mm) in cross‐linked polyethylene (XLPE) were investigated by experiments of conduction current and space charge. The results show that current density from low electric field to sample breakdown corresponds to space charge limited current (SCLC) theory. More specifically, Schottky current is similar to experiment current before 100 kV/mm, while the J – E curve conforms to a modified SCLC theory after 100 kV/mm. Besides, the non‐linear coefficient of J – E curve from 100 kV/mm to extra high electric field is smaller than theoretical value, and the injection depth of space charge is restricted as the field becomes higher than 100 kV/mm, which may be caused by the negative differential mobility of charge. Driven by extra high electric field, charge collides with lattice of dielectric and scatters. As a result, mean free time of charge decreases and charge mobility is reduced with the increased field. Consequently, considering the decrease in charge mobility, a mobility‐limited charge injection equation is proposed, and the validity of the proposed equation under extra high electric field is demonstrated by space charge simulation.