Investigation of Thermal Ageing of Solar Cables due to Repetitive Current Load

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Supervisor:
Dr. Tamus Zoltán Ádám
Department of Electric Power Engineering

With the development and utilization of solar energy, photovoltaic power generation has become the main way to develop solar energy. The active development of photovoltaic cables as transmission components is of great significance. Solar energy has been developed to meet the operational requirements of photovoltaic systems under harsh outdoor environmental conditions. The photovoltaic cable has good high and low temperature resistance, strong UV resistance, good acid and alkali corrosion resistance and good wear resistance. Long life, low smoke and halogen free flame retardant. A common factor in most photovoltaic systems is outdoor use, characterized by high temperature and high UV radiation, single core cable, temperature range from -40 ° C to +90 ° C ambient temperature, conductor temperature of 120 ° C, service life For 25 years to prevent heat aging. The ambient temperature and conductor temperature are derived from the Arrhenius polymer aging law, which doubling the aging of the polymer every 10 °C increase.

The purpose of this work is to investigate the effects of thermal stress on cable life of photovoltaic installations. The purpose of this experiment was to accelerate the aging process of the PV insulated cable and study the electrical parameters (capacitance and dissipation factor) of the insulating material. The method developed will be based on dielectric measurements.

Firstly, through the research on the environment of photovoltaic cable, cable structure and aging mechanism of insulating materials, experiments to accelerate the thermal aging of cables were carried out. This work includes accelerated aging tests to reveal the correlation between cable performance parameters and non-destructive electrical test results. Then the cable is heated by the laboratory equipment, the current is passed through the cable, and the experimental temperature reaches 120 ° C, the cable aging is accelerated, the cable aging process caused by the repeated current load is simulated, and then the electrical properties of the insulating material are measured again, and measured before aging. The electrical parameters were compared and the aging results were evaluated to reveal the concept of aging and insulation properties.

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