Search results for "PD pattern"

showing 3 items of 3 documents

Remote voltage synchronization for wireless Partial Discharge diagnostics

2016

The main objective of this paper is the assessment of the exact phase angle displacement of each Partial Discharge, PD, pulse with respect to the voltage reference waveform. Such problem also referred to as ‘synchronization’ is relevant when the cable is not accessible and the PD measure is carried out in wireless mode. It is well known, that the angle phase shift, due to the propagation phenomenon on the transmission line, can be calculated knowing the line type and length and typical operating conditions of the transmission line. The setup comprises a customized electronic device, the “Phase check”, a server to collect remote measurements and a Look up table to provide corrections to the …

Materials sciencePhase (waves)02 engineering and technologySynchronization01 natural sciencesSynchronization (alternating current)Transmission line0103 physical sciences0202 electrical engineering electronic engineering information engineeringWaveformElectrical and Electronic Engineeringpropagation phenomenon010302 applied physicsPolymers and Plasticremote measurebusiness.industryElectronic Optical and Magnetic Material020208 electrical & electronic engineeringPhase angleElectrical engineeringSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaSettore ING-IND/31 - ElettrotecnicaElectric power transmissionPartial dischargePD patternCeramics and CompositesPartial DischargebusinessVoltage reference
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A new technique for partial discharges measurement under DC periodic stress

2017

The aim of the present work is to recognize the type of defect in insulating materials employed in DC electrical systems. This analysis, under AC stress, is carried out by using the Phase Resolved method (PRPD). While, under constant voltage stress this method cannot be performed and measurements show complexities. In order to overcome these problems, a new technique is proposed, based on the application of a periodic continuous waveform. Simulation results, carried out by using a model based on a time-variable conductance of an air void defect, showed the PRPD pattern that can be obtain. Furthermore, compared to the constant DC stress, the measurement duration became lower and the discharg…

010302 applied physicsVoid (astronomy)Materials scienceHVDCElectronic Optical and Magnetic MaterialConductanceStress measurementMechanicsDC stre01 natural sciencesSpace chargeSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaSettore ING-IND/31 - ElettrotecnicaPartial discharge0103 physical sciencesWaveformConstant voltagePRPD patternElectrical and Electronic Engineering010306 general physics
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Overcoming synchronization issues in wireless technology Partial Discharge measurement

2016

In this paper, several aspects of the fundamentals of wireless Partial Discharge (PD) measurements are first discussed. Then, the relevance of the problem of voltage synchronization in PD wireless diagnosis is outlined. When portable instruments are used for PD detection, the main issue is the voltage measurement at the site where the PD detection is carried out. When such analysis is carried out over shielded cables, the AC (50/60 Hz) voltage reference signal is not easily detectable, while one of the basic parameters for PD diagnosis, the displacement of the inception voltage of the PD as compared to the reference voltage, is not available. Even if highperformance sensors are readily avai…

EngineeringEnergy Engineering and Power Technology02 engineering and technology01 natural sciencesSignallaw.inventionSynchronization (alternating current)law0103 physical sciencesShielded cable0202 electrical engineering electronic engineering information engineeringElectronic engineeringWirelessElectrical and Electronic Engineering010302 applied physicsbusiness.industryRenewable Energy Sustainability and the Environment020208 electrical & electronic engineeringElectrical engineeringSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaSettore ING-IND/31 - ElettrotecnicaPartial dischargePD patternPartial DischargebusinesssynchronizationVoltage referenceVoltage
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