摘要
利用DELTA-2000测试仪对电缆试样进行介质损耗角正切(tanδ)的测量试验,发现电缆试样的tanδ开始为负值,但随着测量电压的升高,tanδ逐渐增大,之后tanδ变成正值,直到试样发生表面击穿。对试验结果进行分析,得到电缆试样的tanδ值为负值的主要原因是外界电磁场对电桥的干扰和标准电容损耗较大,并提出了相应的技术处理措施。
In the measurement of dielectric loss tanδ on cable samples using DELTA-2000 instrument, it is found that the dielectric loss tanδ is negative at first, then increases with the increase of testing voltage, later becomes positive, and finally the sample surface is broken-down. Analysis on the experiment results reveals that the causes of negative tanδ are mainly due to the interference of external electromagnetic field on the electric bridge and bigger capacitance loss, at the same time some correspondent technical measures are taken to remedy it.
出处
《光纤与电缆及其应用技术》
2008年第4期13-15,共3页
Optical Fiber & Electric Cable and Their Applications
基金
四川省教育厅自然科学青年基金资助项目(2006B117)
关键词
电缆
介质损耗角正切
测试
cable
dielectric loss tanδ
measurement
