摘要
为了评估干式变压器的寿命 ,必须研究环氧树脂的老化机理。介绍了环氧树脂样品的热氧老化加速寿命试验的原理和方法。文中试品采用 60 mm× 1 5mm× 6mm的长方体。用热质量损失作为描述老化特性的性能指标。通过加速寿命实验研究 ,求得在设定温度为 1 70℃及 1 55℃条件下 ,样品热质量损失与暴露时间的关系曲线 ,及求得质量损失达到 3.4%时 ,老化时间分别为 360 0 h和 2 80 0 0 h,温度指数为 1 60℃。并发现 ,在同一暴露时间 ,热质量损失服从正态分布。
The aging mechanism of epoxy resin should be investigated to evaluate the lifetime of dry type transformers. The principle and methodologies are introduced for accelerated aging tests of F type epoxy resin samples. Sample sizes are 60mm×15mm×6mm. The percentage mass loss is used to characterize the thermal oxygen aging. In the accelerated aging test, the thermal mass loss is measured as a function of time at 170℃ and 155℃ to develop a temperature index. The estimated aging times based on a 3.4% mass loss are 3600h for 170℃ and 28000 h for 150℃. For equal exposure times, The percentage thermal mass loss is distributed normally.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2000年第7期1-3,共3页
Journal of Tsinghua University(Science and Technology)
基金
教育部博士点专项科研基金! ( 1 9990 0 0 347)
关键词
环氧树脂
热氧老化
暴露时间
加速寿命试验
epoxy resin
thermal oxygen aging
exposure time
accelerated aging test
