Experimental Evaluation of Rogowski Coil Performance for Locating PD in Energized Overhead Covered-Conductor Feeder

An experimental analysis is performed to evaluate Rogowski coil performance for PD (partial discharge) location on overhead CC (covered-conductor) distribution lines. The measuring set-up is arranged in high voltage laboratory. A multi-end measuring method is chosen as a technique to locate PD source point on the line. A power transformer is used to energize one end of the CC line by the AC voltage source. The performance of Rogowski-coil is tested in noisy environment. The tests are carried out concerning different measurement conditions such as off-line and on-line PD measuring systems. The results obtained from the laboratory measurements confirm the capability of the Rogowski-coil in order to measure and locate the high frequency PD source on the CC line in consistent with energizing AC source. Chirp detector is used as a signal-processing tool in order to extract the PD signals and then apply the locator algorithm.

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

[2]  Matti Lehtonen,et al.  Evaluation of chirp detector-based travelling wave localization of earth faults in MV networks , 2010 .

[3]  Ye Miaoyuan,et al.  Improved performance Rogowski coils for power system , 2003, 2003 IEEE PES Transmission and Distribution Conference and Exposition (IEEE Cat. No.03CH37495).

[4]  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).

[5]  A. Elhaffar,et al.  Experimental Investigations on Multi-end Fault Location System based on Current Traveling Waves , 2007, 2007 IEEE Lausanne Power Tech.

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

[7]  Jr. S. Marple,et al.  Computing the discrete-time 'analytic' signal via FFT , 1999, Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136).

[8]  Lj. A. Kojovic.  Rogowski Coil Transient Performance and ATP Simulations for Applications in Protective Relaying , 2005 .

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

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

[11]  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.