An overview of automated recognition of partial discharges (PD) is given. The selection of PD patterns, extraction of relevant information for PD recognition and the structure of a data base for PD recognition are discussed. Mathematical methods useful for the design of the data base are examined. Classification methods are interpreted from a geometrical point of view. Some problems encountered in the automation of PD recognition are addressed. >

/pdf/automated-recognition-of-partial-discharges-3fe0r7jad7.pdf

Automated recognition of partial discharges

An article providing background on fundamentals of partial discharge, especially as related to field PD testing of cable systems.

Fundamentals of partial discharge in the context of field cable testing

The paper shows that open-loop noise reduction techniques can be effective in separating partial discharge (PD) signals from noise. Wavelet-based denoising through the use of thresholding of wavelet coefficients provides near optimal noise reduction for many classes of signals including PD signals in noise. The effectiveness of wavelet transform-based noise reduction depends on selection of an appropriate wavelet basis function as well as on careful selection of threshold function and levels.

Detection of PD utilizing digital signal processing methods. Part 3: Open-loop noise reduction

PD testing and location is an essential part of factory testing of shielded solid dielectric power cable. The accuracy with which a PD source can be located is limited by high frequency attenuation of PD pulses as they propagate through the cable.

Partial discharge. XXII. High frequency attenuation in shielded solid dielectric power cable and implications thereof for PD location

• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers.

/pdf/on-line-detection-and-location-of-partial-discharges-in-2s95q30m29.pdf

On-line detection and location of partial discharges in medium-voltage power cables

Errors in partial discharge (PD) location on high voltage dielectric cables caused by both mechanical and electrical phenomena are discussed. The sources of error relevant to PD location include errors in measuring time delays, scatter caused by noise and disturbances, pulse propagation distortion, errors in cable length measurement, and trivial errors in experimental technique. Experiments to determine typical PD location error were carried out using a detector with a 10 MHz bandwidth. Extensive tests were carried out on a 200 m, 15 kV cable with metering marks on the outer sheath, as well as a 590 m, 10 kV cable without metering marks. >

/pdf/partial-discharge-xviii-errors-in-the-location-of-partial-5ak1sdj8yu.pdf

Partial discharge. XVIII. Errors in the location of partial discharges in high voltage solid dielectric cables

The use of an optical detection system for measuring surface discharges is described. A photomultiplier tube (PM) transforms the photon pulses emitted by the discharge process into an electrical signal. To suppress the noise inherent to PM operation, filters were built in the amplitude- and time-domains. Results of discharge measurements showed that in some situations, the sensitivity of the optical system exceeds that of electrical methods. >

https://ieeexplore.ieee.org/iel1/14/144/00002386.pdf

W.A. Sonneveld

Papers

Partial discharge. XVIII. Errors in the location of partial discharges in high voltage solid dielectric cables

Optical detection of surface discharges