Dynamic Thermal Analysis of High-Voltage Power Cable Insulation for Cable Dynamic Thermal Rating
Dynamic Thermal Analysis of High-Voltage Power Cable Insulation for Cable Dynamic Thermal Rating
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DOI：
10.1109/access.2019.2913704
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发表时间：
2019-04
期刊：
影响因子：
3.9
通讯作者：
Pengyu Wang;Hui Ma;Gang Liu;Zhuozhan Han;Deming Guo;Tao Xu;Long Kang
中科院分区：
文献类型：
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作者：
Pengyu Wang;Hui Ma;Gang Liu;Zhuozhan Han;Deming Guo;Tao Xu;Long Kang
低导热系数电缆绝缘在高压电缆中占有很大比例，对电缆绝缘动态热行为进行优化分析，有助于提高电缆动态热额定值的准确性。本文采用理论分析和有限元分析相结合的方法对电缆绝缘进行了动态热分析。通过分析，证明了采用IEC推荐的电缆绝缘瞬态热模型会给电缆动态温度评估带来一定的误差，尤其是在电缆温升的早期阶段。此外，本文还提出了一种可实现的电缆绝缘瞬态热模型优化方法。通过有限元分析，验证了优化模型与IEC模型在电缆动态热额定值方面的改进。结果表明，优化后的模型比IEC模型能更好地模拟电缆的动态热行为，对高电压等级、大负荷下的电缆动态热额定值的改善更为明显。本文中开发的方法可以为电力公司铺平道路，以提高电缆的利用率，同时仍然确保电缆的可靠性。
Since cable insulation with low thermal conductivity occupies a large proportion of high-voltage cable, an optimization analysis on dynamic thermal behavior of cable insulation can be very useful to improve the accuracy of cable dynamic thermal rating. In this paper, the dynamic thermal analysis of cable insulation is carried out by combining the theoretical method and finite-element analysis (FEA) method. Based on the analysis, it is proved that using IEC recommended transient thermal model of cable insulation will bring certain error to cable dynamic temperature evaluation, especially at the early stage of cable temperature rise. Moreover, in this paper, an implementable optimization method for transient thermal model of cable insulation is developed. The improvement of the optimized model compared with the IEC model on cable dynamic thermal rating is verified by the FEA method. The results confirm that the optimized model can better model the dynamic thermal behavior of cable than the IEC model and the improvement is more obvious for dynamic thermal rating of cable with high voltage level and under large load. The methodology developed in this paper can pave a way for electricity utilities to increase cable utilization while still ensuring cable reliability.