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http://dx.doi.org/10.5370/JEET.2015.10.3.1107

Study on Influences and Elimination of Test Temperature on PDC Characteristic Spectroscopy of Oil-Paper Insulation System  

Liu, Xiao (State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University)
Liao, Ruijin (State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University)
Lv, Yandong (Alstom Grid Technology Center Co. Ltd)
Liu, Jiefeng (State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University)
Gao, Jun (State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University)
Hao, Jian (State Grid Chongqing Electric Power Co. Electric Power Research Institute)
Publication Information
Journal of Electrical Engineering and Technology / v.10, no.3, 2015 , pp. 1107-1113 More about this Journal
Abstract
Test temperature is an important factor affecting the measurement results of dielectric response of field power transformers. In order to better apply the polarization and depolarization current (PDC) to the condition monitoring of oil-paper insulation system in power transformers, the influences and elimination method of test temperature on PDC characteristic spectroscopy (PDC-CS) were investigated. Firstly, the experimental winding sample was measured by PDC method at different test temperatures, then the PDC-CS was obtained from the measurement results and its changing rules were discussed, which show that the PDC-CS appears a horizontal mobility with the rise of temperature. Based on the rules, the “time temperature shift technique” was introduced to eliminate the influence of test temperature. It is shown that the PDC-CS at different test temperatures can be converted to the same reference temperature coincident with each other.
Keywords
Test temperatures; Oil-paper insulation system; PDC characteristic spectroscopy (PDC-CS); Time temperature shift technique;
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