Search results for " partial discharge measurements"

showing 3 items of 3 documents

Time Evolution of Partial Discharges in a Dielectric Subjected to the DC Periodic Voltage

2022

Partial discharge (PD) detection can be considered one of the most useful tools for assessing the insulation conditions of the power apparatus in high-voltage systems. Under AC conditions, this analysis is widely employed in online and offline tests, such as type tests or commissioning, and can be carried out by applying the phase-resolved PD (PRPD) method, since the patterns can give information about the defect classification. Under DC voltages, the classic pattern recognition method cannot be performed, and the measurements show complexities related to the nature of the phenomena. For this reason, to date, a standard for PD measurements under DC does not exist. In previous papers, a new …

Direct current periodic (DCP)partial discharge (PD); direct current periodic (DCP); partial discharge measurements; HVDC; DCSettore ING-IND/31 - ElettrotecnicaControl and OptimizationHVDCRenewable Energy Sustainability and the EnvironmentEnergy Engineering and Power TechnologyElectrical and Electronic EngineeringPartial discharge (PD)Engineering (miscellaneous)DCEnergy (miscellaneous)Partial discharge measurementsEnergies; Volume 15; Issue 6; Pages: 2052
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A combined CWT-DWT method using model-based design simulator for partial discharges online detection

2009

The suppression of noises is fundamental in onsite Partial Discharge (PD) measurements. For this purpose, the wavelet transform analysis method has been developed and it is a powerful tool for processing the transient and suddenly changing signals. As the wavelet transform possesses the properties of multi-scale analysis and time-frequency domain localization, it is also particularly suitable to process the suddenly changing signals of the partial discharge pulse (PD). In this paper, an improved Wavelet denoising method developed by a model-based design software is presented. Simulations are provided as well as some results obtained during laboratory experiment and on-line PD measurements. …

Settore ING-IND/31 - ElettrotecnicaWaveletComputer scienceNoise reductionPartial dischargeModel-based designdiscrete wavelet transforms partial discharge measurements time-frequency analysis transientsElectronic engineeringSoftware designWavelet transformContinuous wavelet transformTime–frequency analysis2009 IEEE Conference on Electrical Insulation and Dielectric Phenomena
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Critical issues in the PD testing methodology for XLPE-insulated MV cables: An experimental case

2017

This paper describes some critical issues arising during the partial discharge (PD) testing of a 500m delivery length of an XLPE-insulated MV cable. At first, conventional PD measurements were performed on the whole length by using a standard acquisition system; PDs activity was detected, but the system allowed the operator to localize the PDs only on a length of 70 m. A visual inspection of this section highlighted the presence of an excoriation in the outer sheet. Aiming at a more accurate pin-pointing of the defect, more measurements were carried out in the proximity of the outer defect using a portable PD detection system. These measurements showed PDs activity, whose source was located…

010302 applied physicsOperator (computer programming)Cables Cable testing MV cables Partial Discharges Partial Discharge Measurements Partial Discharge testing PD detection Wireless PD detection XLPE-insulated cablesSection (archaeology)Computer scienceAcoustics0103 physical sciencesExcoriationPartial discharge01 natural sciences2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP)
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