热失控
偏心率(行为)
电流(流体)
机械
导线
热的
电压
材料科学
电气工程
工程类
结构工程
功率(物理)
物理
复合材料
热力学
电池(电)
政治学
法学
作者
Pranav Johri,C. C. Reddy
出处
期刊:IEEE Transactions on Dielectrics and Electrical Insulation
[Institute of Electrical and Electronics Engineers]
日期:2024-01-01
卷期号:: 1-1
标识
DOI:10.1109/tdei.2024.3353168
摘要
This paper presents the electro-thermal runaway characteristics of an extruded high voltage direct current (HVDC) cable, in the presence of eccentricity, i.e., a misalignment in the axes of cable conductor and insulation, which is practically unavoidable in extruded cables. In particular, eccentricity in DC case assumes importance due to non-linear, temperature (or load current) dependent field dynamics as compared to alternating current (AC) case. Effect of eccentricity on electro-thermal breakdown has not received adequate attention till now. In this work, the authors simulate the runaway in a HVDC cable and investigate the impact of eccentricity under different scenarios such as short-time and long-time instability, using a comprehensive FEM model. The results show a drastic shift in phenomenon from traditional global thermal breakdown to local thermal breakdown due to eccentricity in power cables. The results are validated with analytical computations.
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