基于极化-去极化电流法变压器油纸绝缘老化状态评估  

Condition Assessment of Oil-paper Insulation Ageing for Transformer Based on Polarization-depolarization Current Method

作　　者：赵荣普 陈井锐 赵威 王朝宇 周凯[2] 张福忠[2] Zhao Rongpu;Chen Jinrui;Zhao Wei;Wang Chaoyu;Zhou Kai;Zhang Fuzhong(Kunming Power Supply Bureau of Yunnan Electric Power Grid Co., Ltd., Kunming 650200, China;Electrical Engineering and Information, Sichuan University, Chengdu 610065, China)

机构地区：[1]云南电网有限责任公司昆明供电局,昆明650200 [2]四川大学电气信息学院,成都610065

出　　处：《绝缘材料》2017年第12期78-82,共5页Insulating Materials

摘　　要：为了能准确快速地评估变压器油纸绝缘的老化状态,利用极化-去极化电流法(PDC)对变压器油纸绝缘的老化状态进行研究。通过在实验室内对不同运行年限的变压器进行PDC测试,提取直流电导率、非线性系数和低频介质损耗等特征参量,同时在现场对变压器进行PDC测试,提取相应的特征参量。结果表明:在实验室无干扰的情况下,PDC能有效分辨出变压器油纸绝缘的不同老化状态。在现场干扰严重情况下,PDC测试方法具有较好的抗干扰能力,特征参量对变压器油纸绝缘的老化状态比较敏感,可定性评估变压器油纸绝缘的老化状态。In order to accurately and fast assess the oil-paper insulation ageing status of transformer, polar- ization-depolarization current （PDC） method was used to research the oil-paper insulation ageing status of transformer. First, the PDC of transformers with different operating yeas was tested in the laboratory, and the characteristic parameters such as DC conductivity, nonlinear coefficient, and dielectric loss at low fre- quency were extracted. Second, the PDC of transformers was tested in field, and the corresponding char- acteristic parameters were extracted also. The results show that the PDC method can effective distinguish the different oil-paper insulation ageing status of transformer in laboratory without interference, and it has good anti-interference ability in field with serious interference. The characteristic parameters are sensitive to the oil-paper insulation ageing status of transformer, which could qualitative assess the oil-paper insula- tion ageing status of transformer.

关 键 词：变压器 油纸绝缘 PDC 状态评估 

分 类 号：TM215.6[一般工业技术—材料科学与工程] TM411[电气工程—电工理论与新技术]