Principles of Charge Estimation Methods Using High-Frequency Current Transformer Sensors in Partial Discharge Measurements

Sensors

Armando Rodrigo-Mor¹  FabioA. Muñoz¹  LuisCarlos Castro-Heredia¹ 

[1] Electrical Sustainable Energy Department, Delft University of Technology, 2628 CD Delft, The Netherlands;

关键词: high-frequency current transformer;    HFCT;    Rogowski coils;    magnetic loop antenna;    partial discharge;    PD;   

DOI  :  10.3390/s20092520

来源: DOAJ

【 摘 要 】

This paper describes a simplified model and a generic model of high-frequency current transformer (HFCT) sensors. By analyzing the models, a universal charge estimation method based on the double time integral of the measured voltage is inferred. The method is demonstrated to be valid irrespective of HFCT sensor, assuming that its transfer function can be modelled as a combination of real zeros and poles. This paper describes the mathematical foundation of the method and its particularities when applied to measure nanosecond current pulses. In practice, the applicability of the method is subjected to the characteristics and frequency response of the sensor and the current pulse duration. Therefore, a proposal to use the double time integral or the simple time integral of the measured voltage is described depending upon the sensor response. The procedures used to obtain the respective calibration constants based on the frequency response of the HFCT sensors are explained. Two examples, one using a HFCT sensor with a broadband flat frequency response and another using a HFCT sensor with a non-flat frequency response, are presented.

【 授权许可】

Unknown