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Development and Evaluation of 3-terminal Type Capacitive Sensor for the Diagnosis of Electrical Insulating Oil  

Kim, Ju-Han (충남대학교 전기공학과)
Han, Sang-Ok (충남대학교 전기공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers P / v.58, no.4, 2009 , pp. 476-482 More about this Journal
Abstract
This paper describes the development of capacitive sensor for the diagnosis of liquid dielectrics, which is widely used as the electrical insulating oil of transformer, circuit breaker, cable and etc. To survey the dielectric properties of the virgin and aged electrical insulating oils, we utilized the highly precise measuring system, using the principle of cross capacitance. The measured properties were used to determine the design factors of the sensor. Then the factors were optimized with the help of computational analysis. To evaluate diagnosis by the sensor, we performed accelerated thermal aging test about electrical insulating oils. The condition of aged specimens were investigated by measurements of relative permittivity i.e. capacitance change by capacitive sensor. And to evaluate the hysteresis characteristics with the change of temperature, we constructed a testing system, which was composed with vacuum drying oven, oil chamber and measuring instruments, such as LCR meter, MUX and so forth. Through the results of this investigation, we confirmed the superior characteristics of the newly developed sensor.
Keywords
Insulating Oil; Aging; Relative Permittivity; 3-Terminal Electrodes; Capacitive Sensor;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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