摘要
电气设备运行过程中常产生较高的温度,在热能作用下,其绝缘材料的性能会逐渐下降。阐述了在实验室中模拟环氧树脂在温度80℃和120℃下的热老化状态,测试了这两种温度下不同老化程度试样的局部放电,分析了放电信号在频域随老化时间的变化情况。实验结果表明,随着老化时间的增加,放电脉冲时域波形的高频振荡不断加剧;同时,频域中的高频分量越来越丰富,谱峰逐渐增多,并且在高频段出现特征峰分布;热老化温度越高,高频特征峰越高,出现得越早范围越宽。
Electrical equipment will produce high temperature in process of running, while the temperature rises, the performance of its insulating material will gradually degrade. The epoxy resin＇ s thermo senescence under the temperature of 80 ℃ and 120℃ was separately simulated by experiment, and the partial discharge of different aging samples was tested. Then the performance of electric discharge signal in time domain and frequency domain with the change of aging time was analyzed. Experimental results show that with the continuous deterioration of insulation samples, the discharge pulse time domain waveform of high frequency oscillation continually grows. In addition, the high frequency component in frequency domain becomes more and more abundant, the frequency spectrum peak increases gradually and characteristic peak distribution appears in the sector of high frequency. The higher of thermo senescence temperature and the more frequently of characteristic peak high frequency, the earlier does characteristic peak high frequency appear and the wider is its domain.
出处
《绝缘材料》
CAS
2008年第3期49-51,共3页
Insulating Materials
关键词
热老化
局部放电
频域分析
特征峰
thermal aging
partial discharge
frequency domain analysis characteristics peak
