Electrical Integrity Tests and Analysis of Low Voltage Photovoltaic Cable Insulation under Thermal Stress

2019 7th International Youth Conference on Energy (IYCE) Pub Date : 2019-07-01 DOI:10.1109/IYCE45807.2019.8991556

E. Mustafa, Ramy S. A. Afia, Tamus Zoltán Ádám

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引用次数: 2

Abstract

In the last decade, photovoltaic power systems have emerged as a leading source of electrical energy. Due to its outdoor installation, it is exposed to all sorts of climatic stresses, such as mechanical, ultraviolet radiation, temperature, and humidity stresses. Safe and reliable operation of the photovoltaic systems is highly dependent on the DC cables installed between the photovoltaic modules and inverters. Since these cables not only carry the load current but are also exposed to the external harsh environment and hence are more vulnerable to degradation. This research has been aimed to study the aging of low voltage photovoltaic DC cables under thermal stress. The cable samples are thermally accelerated aged and the electrical integrity of these cables are studied by the dissipation factor and capacitance measurement in the frequency range of 20 Hz to 500 kHz. The results show that because of aging the dipolar polarization has been affected. Also, the minimum value of the dissipation factor has significantly decreased at lower frequencies, in addition, the shifting of the minimum value of dissipation factor to lower frequency with the aging has also been observed.

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热应力下低压光伏电缆绝缘电气完整性测试与分析

在过去的十年里，光伏发电系统已经成为电能的主要来源。由于其安装在室外，它暴露在各种气候应力下，如机械、紫外线辐射、温度和湿度应力。光伏发电系统的安全可靠运行在很大程度上取决于安装在光伏组件和逆变器之间的直流电缆。由于这些电缆不仅承载负载电流，而且还暴露在外部恶劣环境中，因此更容易退化。本研究旨在研究热应力作用下低压光伏直流电缆的老化问题。对电缆样品进行热加速老化，并在20hz ~ 500khz频率范围内通过损耗系数和电容测量对电缆的电气完整性进行了研究。结果表明，由于老化，偶极极化受到影响。在较低的频率下，耗散因子的最小值明显减小，并且随着老化，耗散因子的最小值向较低的频率移动。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 7th International Youth Conference on Energy (IYCE)

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