![]() After the experiment, the silicone rubber degradation is assessed using the static contact angle measurements. high humidity (80 to 90%), medium humidity (65 to 75%), and low humidity (30 to 40%).Īt each testing conditions, three silicone samples are tested simultaneously. Three humidity levels are considered, i.e. The humidity level inside the test chamber is increased through creating mist from deionized water using an ultrasonic humidifier. The UV radiation with 1 mW/cm2 intensity is generated from UVA-340 lamps. The experiment is performed inside a testing chamber where both the humidity level and UV radiation can be controlled. The gap distance between the surface of samples and the tip of the needle was set at 6 mm. Experiments are conducted by generating corona discharges using a high AC voltage of 10 kV applied to sharp needle electrodes on the surface of SiR samples for 24 hours. This motivates this study to investigate the impact of corona along with other weather conditions on the aging of SiR material. However, the literature to analyze the synergetic effect of corona and various weather conditions on the aging of silicone rubber material is still insufficient. Hence, extensive research has been conducted to understand the performance of silicone rubber material exposed to corona discharges under varied weather conditions. Moreover, severe environmental conditions like ultraviolet (UV) radiation and high humidity can accelerate the aging process caused by corona. Studying the SiR resistance to corona can be considered of great interest because the corona is one of the essential aging factors affecting the SiR insulators. These factors also may possess synergistic impact, which can aggravate the aging process. Some of these factors are related to weather, while others associated with system conditions, including electrical discharges generated from corona and/or dry band arcing. The aging of SiR insulators is dependent on several factors. However, SiR insulators are subjected to different stresses that may lead to their aging that may lead to the loss of their hydrophobicity property. The impetus for increasing SiR applications in outdoor insulators is its unique hydrophobicity ability. Silicone rubber (SiR) material has been utilized as a replacement to ceramic insulators. Supervisor(s): Jayaram, Sheshakamal - El-Hag, Ayman (Adjunct) Average precipitation during this same period was 31.31 inches (3.72 inches above average), making it the fifth-wettest year to date on record.Title: Effects of Corona Discharges on Silicone Rubber Samples under Severe Weather Conditions temperature for the year to date (January through November) was 55.2 degrees F (1.4 degrees above average) – the 16th warmest YTD on record. The average temperature for autumn was 53.8 degrees F (0.2 degrees above average), which ranked near the average of the 124-year record. It was the second-wettest meteorological autumn (September through November) on record for the contiguous U.S., with a precipitation total of 9.61 inches (2.73 inches above average). The year to date and meteorological autumn Parts of the Mid-Atlantic and Northeast had record precipitation, while parts of the Northwest, Southwest and Southern Plains were drier than average. The average precipitation for November was 2.64 inches (0.41 above average), ranking it among the wettest third on record. States from the Great Plains to the East Coast had below average temperatures, while the West Coast and Florida, experienced above-average temperatures, according to scientists with NOAA’s National Centers for Environmental Information. was 40.1 degrees F (1.6 degrees below average), ranking it among the coolest third of the 124-year record for November. The average November temperature across the contiguous U.S. climate report: Climate by the numbers November 2018 What follows are highlights from NOAA’s latest monthly U.S.
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