Calibration of on-line partial discharge measuring system using Rogowski coil in covered-conductor overhead distribution networks

Partial discharge (PD) detection has been regarded as one of the most effective on-line predictive maintenance test and diagnostic tool for the condition monitoring of high voltage (HV) equipment. In this study, a methodology for detecting on-line PDs produced because of falling trees on the covered-conductor (CC) overhead distribution lines is introduced and calibration of PD measuring system is carried-out. The Rogowski coil is used as a PD sensor which is non-intrusive and superior to the conventional PD detectors. The experimental set-up was arranged in the HV laboratory for real-time analysis and a pulse calibrator was used to calibrate the PD measuring system. Few real-life PD measurements have been taken and it is revealed that PD magnitudes and signals bandwidth may vary under various circumstances. The calibrated on-line PD measuring system can be used to detect and measure the amount of PDs produced because of falling trees on CC lines, thus improving the reliability and safety of the distribution networks as well as reducing visual inspection work after storms.

[1]  D. A. Ward,et al.  Experience with using Rogowski coils for transient measurements , 1992 .

[2]  D. A. Ward,et al.  Using Rogowski coils for transient current measurements , 1993 .

[3]  L. Kojovic,et al.  Rogowski coils suit relay protection and measurement ~of power systems\ , 1997 .

[4]  Greg C. Stone,et al.  Continuous on-line partial discharge monitoring of generator stator windings , 1999 .

[5]  S. Guttowski,et al.  Design and evaluation of an active ripple filter with Rogowski-coil current sensing , 1999, 30th Annual IEEE Power Electronics Specialists Conference. Record. (Cat. No.99CH36321).

[6]  Xiandong Ma,et al.  Interpretation of wavelet analysis and its application in partial discharge detection , 2002 .

[7]  P.A.A.F. Wouters,et al.  Fundamental aspects of excitation and propagation of on-line partial discharge signals in three-phase medium voltage cable systems , 2003 .

[8]  P.A.A.F. Wouters,et al.  Synchronization of on-line PD detection and localization setups using pulse injection , 2003, Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials (Cat. No.03CH37417).

[9]  L. Satish,et al.  Wavelet-based denoising of partial discharge signals buried in excessive noise and interference , 2003 .

[10]  M. Argüeso,et al.  Implementation of a Rogowski coil for the measurement of partial discharges , 2005 .

[11]  C. Zhou,et al.  An improved methodology for application of wavelet transform to partial discharge measurement denoising , 2005, IEEE Transactions on Dielectrics and Electrical Insulation.

[12]  S. Birlasekaran,et al.  The study of PD propagation phenomenon in power network , 2006, IEEE Transactions on Power Delivery.

[13]  Ghulam Murtaza Hashmi,et al.  Partial discharge detection for condition monitoring of covered-conductor overhead distribution networks using Rogowski coil , 2008 .

[14]  Matti Lehtonen,et al.  Effects of Rogowski Coil and Covered-Conductor Parameters on the Performance of PD Measurements in Overhead Distribution Networks , 2008 .

[15]  Matti Lehtonen,et al.  Modeling and Experimental Verification of Covered-Conductor for PD Detection in Overhead Distribution Networks : Modeling Covered-Conductor Overhead Distribution Networks for PD Detection , 2010 .

[16]  M. Lehtonen,et al.  Modeling and experimental verification of on-line PD detection in MV covered-conductor overhead networks , 2010, IEEE Transactions on Dielectrics and Electrical Insulation.