摘要
对现场测量电气设备tanδ出现负值的各种原因进行分析和讨论,指出试验回路中如存在接触不良、附加损耗电阻、杂散阻抗等均可导致tanδ测量结果出现负值。提出铁心损耗是电磁式电压互感器产生负介损的一个重要因素。认为短路二次绕组后可同时减小铁心损耗和电感的影响。最后提出了解决tanδ为负值的一些措施。
Reasons of negative value of tan δ of electric devices in field test are analyzed and discussed. It is pointed out that poor contact, additional loss resistance, stray impedance etc in the test circuit may lead to the negative value of tan δ. It is proposed that the iron loss of electromagnetic transformer is an important factor to the negative loss. It is considered that the short circuit of secondary coil can reduce the influence of both iron loss and reactance. At last, measures to solve the negative value of tan δ are proposed.
出处
《广西电力》
2012年第6期66-69,共4页
Guangxi Electric Power
关键词
绝缘
试验
介质损耗
负值
insulation,test,dielectric loss,negative value
