Open AccessHeating source of glass fibre reinforced polymer under AC and DC electric fields after hygrothermal ageing
Author(s) -
Yuan Zhikang,
Tu Youping,
Wang Cheng,
Wang Cong
Publication year - 2020
Publication title -
iet science, measurement and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.418
H-Index - 49
eISSN - 1751-8830
pISSN - 1751-8822
DOI - 10.1049/iet-smt.2019.0423
Subject(s) - materials science , composite material , glass fiber , insulator (electricity) , electric field , composite number , moisture , electrical conductor , direct current , fibre reinforced plastic , partial discharge , electrical engineering , voltage , physics , quantum mechanics , engineering
The abnormal temperature rise of glass fibre reinforced polymer (GRP) composite in the composite insulator, which has been reported as the early stage of decay‐like fractures, has gained significant attention from both industrial and academic sectors. In this study, GRP rod samples, obtained from composite insulators were subjected to hygrothermal ageing and were tested under the conditions according to IEC 62217. The leakage current, partial discharge and temperature rise of the samples were measured. All three parameters tended to increase with the ageing time under AC and DC electric fields. The power contribution supplied by partial discharge could be ignored. Simulation results proved that the temperature rise was mainly caused by the volume current. Under the DC electric field, the conductive current was the heating source, whereas under the AC electric field, the heating power was supplied by both conductive current and the polarisation loss. The content of absorbed moisture in the GRP rod sample showed a linear relationship with the temperature rise. The moisture absorption property can be used as an index to evaluate the ageing state of GRP rod in the composite insulator.