Estimating the location of partial discharges in cables

There are several techniques that can be used to estimate the location of partial discharges in cables, however, certain technical obstacles need to be overcome before acceptance of this type of testing becomes widespread. A review of the theory of signal propagation in power cables is presented along with its relation to partial discharge site location. Fundamental limitations affect the detectability and location accuracy of partial discharges in power cables. The sources of these errors are discussed along with methods that minimize their effects. The advantages and disadvantages of alternative methods for locating partial discharge sites are presented along with a calibration method that improves the accuracy of these methods. >

[1]  Robert B. Northrop,et al.  Signal processing techniques for partial discharge site location in shielded cables , 1990 .

[2]  Alfred O. Hero,et al.  A new generalized cross correlator , 1985, IEEE Trans. Acoust. Speech Signal Process..

[3]  H. Borsi,et al.  A New Method for Detection and Location of Distributed Partial Discharges (Cable Faults) in High Voltage Cables under External Interference , 1982, IEEE Power Engineering Review.

[4]  Y. Fujiwara,et al.  Application of GPT to tan delta measuring apparatus for distribution cable in hot line , 1991 .

[5]  M. Kosaki,et al.  New approach to diagnostic method of water trees , 1990, IEEE International Symposium on Electrical Insulation.

[6]  G. Stone,et al.  Fundamental Limitations in the Measurement of Corona and Partial Discharge , 1982, IEEE Transactions on Electrical Insulation.

[7]  New water tree monitoring technique , 1990, Annual Conference on Electrical Insulation and Dielectric Phenomena.

[8]  W. L. Weeks,et al.  Digital estimation of partial discharge , 1987, Conference on Electrical Insulation & Dielectric Phenomena — Annual Report 1987.

[9]  Ralph Otto Schmidt,et al.  A signal subspace approach to multiple emitter location and spectral estimation , 1981 .

[10]  W. Weeks,et al.  Instrumentation for the Detection and Locatiion of Incipient Faults on Power Cables , 1982, IEEE Transactions on Power Apparatus and Systems.

[11]  W. L. Weeks,et al.  Robust Deconvolution of Correlation Functions , 1987, IEEE 1987 Ultrasonics Symposium.

[12]  M. Kruger,et al.  New very low frequency methods for testing extruded cables , 1990, IEEE International Symposium on Electrical Insulation.

[13]  T. Nakayama.  Online cable monitor developed in Japan , 1991 .

[14]  Robert B. Northrop,et al.  Location and characterization of partial discharge sites in shielded power cables , 1990 .