Long-term and Short-term AC Treeing Breakdown of Epoxy/Micro-Silica/Nano-Silicate Composite in Needle- Plate Electrodes
Long-term and Short-term AC Treeing Breakdown of Epoxy/Micro-Silica/Nano-Silicate Composite in Needle- Plate Electrodes
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针板电极中环氧树脂/微硅/纳米硅酸盐复合材料的长期和短期交流树击穿
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Jae‐Jun Park
中科院分区：
文献类型：
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作者：
Jae‐Jun Park
为了表征环氧/微硅/纳米硅酸盐复合材料（EMNC）的绝缘性能，在针板电极之间产生不均匀电场的情况下进行了长期和短期交流树试验。在长期试验中，将10 kV（60 Hz）电场施加到位于绝缘油浴中距离2.7 mm的电极之间的样本上，在纯环氧树脂中观察到典型的树枝型电树，并在施加10 kV电场后1,042分钟发生击穿。同时，EMNC-65-0.3在52,380分钟（36.4天）时看到了树长为的球形树，然后由于树木繁殖率太低而停止了测试。在短期试验中，对 3.5 mm 厚的样品施加电场，以 0.5 kV/s 的递增电压速率直至在 和 处绝缘油浴中击穿，并通过威布尔统计分析估计数据。纯环氧树脂的电绝缘击穿强度为 1,763 kV/mm，而 EMNC-65-0.3 的电绝缘击穿强度为 2,604 kV/mm，修正值为 47%。正如预期的那样，击穿强度在较高的测试温度下下降。
In order to characterize insulation properties of epoxy/micro-silica/nano-silicate composite (EMNC), long-term and short-term AC treeing tests were carried out undr non-uniform electric field generated between needle-plate electrodes. In a long-term test, a 10 kV (60 Hz) electrical field was applied to the specimen positioned between the electrodes with a distance of 2.7 mm in an insulating oil bath at , and a typical branch type electrical tree was observed in the neat epoxy resin and breakdown took place at 1,042 min after applying the 10 kVelectrical field. Meanwhile, the spherical tree with the tree length of was seen in EMNC-65-0.3 at 52,380 min (36.4 day) and then the test was stopped because the tree propagation rate was too low. In the short-term test, an electrial field was applied to a 3.5 mm-thick specimen at an increasing voltage rate of 0.5 kV/s until breakdown in insulating oil bath at and , and the data was estimated by Weibull statistical analysis. The electrical insulation breakdown strength for neat epoxy resin was 1,763 kV/mm at , while that for EMNC-65-0.3 was 2,604 kV/mm, which was a modified value of 47%. As was expected, the breakdown strength decreased at higher test temperatures.