广东电力2023，Vol.36Issue(11)：130-137,8.DOI:10.3969/j.issn.1007-290X.2023.11.014
基于改进定阶法的海底电缆绝缘状态诊断研究
Research on Diagnosis of Insulation State of Submarine Cable Based on Improved Order Method
摘要
Abstract
In order to address the issue of susceptibility to noise interference in the branch identification of the polarization-depolarization current method in current submarine cable insulation diagnostics,an improved branch identification and order determination method based on information entropy theory is proposed.First,we analyze the theoretical reasons for the insufficient accuracy of traditional branch identification methods in noisy environments.Subsequently,using information entropy theory,we determine the order based on the information carried by singular values.Finally,we apply this method to insulation branch identification for both newly manufactured cables in the laboratory and aged cables with water tree defects.The results indicate that the presence of water tree aging defects leads to a different relaxation time of charges in the depolarization process compared to other polarization forms,ultimately resulting in an increase in the number of branches.When applying the improved order determination method to identify branches in water tree-aged cables,it accurately identifies the polarization branches corresponding to water tree aging,validating the effectiveness of the proposed approach and providing insights for submarine cable insulation state diagnostics.关键词
海底电缆/绝缘诊断/极化-去极化电流法/支路辨识/信息熵Key words
submarine cable/insulation diagnosis/polarization and depolarization current method/branch identification/information entropy分类
信息技术与安全科学引用本文复制引用
于是乎,林思衍,吴吉,陈祎林,余欣,周凯,陈宇慧,李银格..基于改进定阶法的海底电缆绝缘状态诊断研究[J].广东电力,2023,36(11):130-137,8.基金项目
中国南方电网有限责任公司科技项目(036100KK52200052(GDKJXM20202022)) （036100KK52200052(GDKJXM20202022）
