Effect of Solar Radiation on Current-Carrying Capacity of PVC-insulated Power Cables – the Numerical Point of View

doi:10.17559/tv-20181029214825

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…At the same time, the heating of the DC and AC cables, which are an integral part of the PV power plant, is also evident. It is clear that the temperature of the cable insulation depends on the insolation, the temperature of the surrounding air, but also the generation of heat inside the cable itself [42]. It can be observed that the influence of the measured wind speeds on the panel and cable temperature is very small, which is consistent with the results of Mayer and Grof [43].…”

Section: High Temperaturessupporting

confidence: 86%

Effects of Extreme Weather Conditions on PV Systems

Bošnjaković,

Stojkov,

Katinić

et al. 2023

Sustainability

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We are witnessing significant climatic changes and increasingly frequent extreme weather conditions affecting every part of the globe. In order to reduce and stop these unfavourable climate changes, there has been a shift to the use of renewables, and in this sense, a significant contribution of the photovoltaic (PV) power plant is planned. This paper analyses the safety, reliability, and resilience of PV systems to extreme weather conditions such as wind storms, hail, lightning, high temperatures, fire, and floods. In addition to using available information from the literature, temperature measurements were also carried out on the rooftop PV power plant in Slavonski Brod, as well as a numerical stress analysis at extreme wind speeds using Ansys software. The results of the analysis show that existing PV systems are very resilient to extreme weather conditions. Utility-scale PV systems can usually withstand wind speeds of up to 50 m/s without any problems, and only at higher speeds do local stresses occur in certain parts of the structure that are higher than permissible. Resistance to hail is also very high, and manufacturers guarantee resistance to hail up to 25 mm in size. At high air temperatures, the temperature of the panel frame can reach about 70 °C, the panel temperature up to 85 °C, and the temperature of the cable insulation over 60 °C, as measurements have shown. Such high temperatures lead to a drop in electricity production up to 30% but do not pose a fire hazard to the cables and the roof if the roof insulation is conducted correctly. Forest fires do not usually pose a direct threat to PV systems, but the smoke that spreads over a large area reduces the solar radiation reaching the PV panel. It can also cause an unfavourable “wiggle effect”. Lightning strikes to a PV panel are not common, although they are possible. With built-in safeguards, no major damage should occur. Flooding is always a possibility, but with properly designed drainage systems, the damage is minimal in most cases.

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Section: High Temperaturessupporting

confidence: 86%

Effects of Extreme Weather Conditions on PV Systems

Bošnjaković,

Stojkov,

Katinić

et al. 2023

Sustainability

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Risk of power cables insulation failure due to the thermal effect of solar radiation

Czapp¹,

Szultka²,

Ratkowski³

et al. 2020

Eksploatacja i Niezawodność – Maintenance and Reliability

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Article citation info: IntroductionDistribution of power in power networks is performed with the use of overhead power lines as well as underground power cables. The investment cost of the underground power cable distribution systems is higher compared to the use of overhead lines but gives higher reliability of supply, especially reflected in improved SAIDI and SAIFI indicators [1,19,24].Power cables are usually buried in the ground, but in many cases, their ending sections are placed in air, to be connected with conductors of overhead lines, as it is presented in Fig. 1. Depending on the height of the pole, length of the power cables in air can be from a few to several meters. Given that the cable section in the air is connected in series with a section buried in the ground, the ampacity of the whole power cable line depends on the section for which thermal condition for heat transfer from the cables is the worst. The worst thermal condition is expected for the section in air, during sunny weather and without any wind.The problem of power cables heating and calculation of their ampacity are the subject of many papers and standards, especially [12-

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Effect of Solar Radiation on Current-Carrying Capacity of PVC-insulated Power Cables – the Numerical Point of View

Cited by 2 publications

References 15 publications

Effects of Extreme Weather Conditions on PV Systems

Effects of Extreme Weather Conditions on PV Systems

Risk of power cables insulation failure due to the thermal effect of solar radiation

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