Abstract
Rogowski coils (RCs) are widely used to measure power or high frequency currents based on their design. In this paper, two types of RCs that are circular (traditional) and cylindrical shapes wound using wire covered by varnish are constructed. This construction is carried out to be suitable for monitoring the discharge current of the surge arrester installed in the distribution system. Concerning high frequency RC modeling for both types considering transfer function is introduced. Self-integrating for both types is attained. Therefore, the experimental tests using function generator for both coils are carried out to identify the parameters of the transfer function representing the introduced model. The measured signals for current and induced voltages are denoised for the parameter identification process. The denoised process is achieved using the MATLAB code ‘wdenoise’ while the parameters are estimated using the system identification toolbox. Verification of the proposed model is achieved using experimental results for the two coils. The sensitivity of the two coils is investigated based on the induced output voltage. The application concerning the two coils for monitoring the discharge current of the surge arrester is done. The results confirm the accuracy of the introduced RC model, as well as the performance of the cylindrical shape, is better than the traditional one. The simulation is carried out using MATLAB and ATPDraw programs.
Highlights
The distribution system is subjected to lightning strokes leading to catastrophic failures due to the huge faults resulting from lightning
Experimental tests were carried out by injecting square pulses using a function generator to identify the parameters of the corresponding transfer function representing the proposed model for the self-integrating coil
Due to the sharpness of the applied current front time, the maximum errors for induced voltage at the starting time were reached to 20% and 13% for circular and cylindrical coils, respectively
Summary
The distribution system is subjected to lightning strokes leading to catastrophic failures due to the huge faults resulting from lightning. CSSE, 2022, vol., no.2 discharge current is essential for estimating the discharge energy and protecting it from burning out Studying such performance needs accurate modeling for distribution systems as well as protecting devices and current monitoring devices such as Rogowski coil. The advantage of the self-integrating coils is that no external circuit is needed for integration to get the required measured current It is appropriate for the applications of monitoring the arrester discharge current as considered in this study. There was no design introduced for this application directly This ensures the importance of this study to continue to the research related to the application of self-integrating Rogowski coil for monitoring the arrester discharge current efficiently and . The proposed model is used to monitor the discharge current of a medium voltage surge arrester in the distribution network. Simulation verification of the proposed model to monitor the discharge current of the surge arrester is accomplished using time and frequency domains
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