采用生物可降解聚乙烯薄膜为试样,考察了污秽程度对绝缘破坏的影响,通过单筒连续变倍视频显微镜对破坏痕取像,利用图像模式识别计算破坏面积与盒子维数,同时与高密度聚乙烯的绝缘破坏特性进行对比,结果表明:生物可降解聚乙烯的击穿电压随污秽程度的加剧而降低,但高于高密度聚乙烯的击穿电压;破坏面积与盒子维数随污秽程度的加剧而减小,但低于高密度聚乙烯的破坏面积与盒子维数.
Eco-friendly insulating materials have been expected to solve severe environmental pollution caused by electric and electronic insulating castoffs. As typical friendly-environmental materials,biodegradable polymers are needed systematical investigation on their electrical properties for the substitute of present insulating materials. Biodegradable polyethylene (BDPE) films were employed as the specimens and high density polyethylene (HDPE) films were selected as the reference. Effects of contamination level on dielectric breakdown properties of BDPE film immersed in artificial saline solutions were investigated by using DC voltage. The breakdown craters were captured by using a monocular-video-zoom microscope. An image-pattern-identification technique was applied to calculate the breakdown area and box dimension of breakdown craters. Obtained results revealed that for both BDPE film and HDPE film, breakdown voltage, breakdown area and box dimension all decrease with increasing the contamination level. By comparing the test results, it showed that under contaminated conditions, breakdown endurance of BDPE film is better than that of HDPE film.
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