Results 41 to 50 of about 2,488 (168)

Partial Discharges Acceptance Criteria for AC Rotating Machines Insulation Systems

IEEE Access
A new pass/fail criterion based on the shape analysis of phase-resolved Partial Discharges (PRPD) patterns is proposed in this study to overcome the problems generated by the use of partial discharge (PD) amplitude threshold levels.
Alfredo Contin, Andrea Piccolo
doaj   +1 more source

Simulation of Partial Discharge Induced EM Waves Using FDTD Method—A Parametric Study

Energies, 2019
This paper reports the results of a parametric study on the characteristics of electromagnetic (EM) waves propagated due to surface- and cavity-type partial discharges (PD) in materials using the finite-difference time domain (FDTD) method. First, the EM
Alaa Loubani, Noureddine Harid, Huw Griffiths, Braham Barkat   +3 more
doaj   +1 more source

Inductive Sensor Performance in Partial Discharges and Noise Separation by Means of Spectral Power Ratios

Sensors, 2014
Partial discharge (PD) detection is a standardized technique to qualify electrical insulation in machines and power cables. Several techniques that analyze the waveform of the pulses have been proposed to discriminate noise from PD activity.
Jorge Alfredo Ardila-Rey, Mónica Victoria Rojas-Moreno, Juan Manuel Martínez-Tarifa, Guillermo Robles   +3 more
doaj   +1 more source

Some Observations on the Dielectric Breakdown and the Importance of Cavities in Insulating Materials used for Cables and Electrical Machines

Advances in Electrical and Computer Engineering, 2011
Partial discharges (PD) contribute greatly to the ageing and the breakdown of solid insulating materials. In the present paper, some conductivity measurements are performed relating the conductivity of inner walls of an enclosed cavity to the behaviour ...
KARLIS, A. D., DANIKAS, M. G.
doaj   +1 more source

Coherent Electro-Thermal Qualification of the Insulation System for Electrical Machines

IEEE Access
Qualification of inverter-fed electrical machines through the procedure suggested in the IEC std. 60034-18-41 entails the application of thermal, mechanical, and ambient stresses, followed by measuring partial discharges (PD-proof test).
A. Rumi, L. Zanotti, A. Cavallini, P. Seri   +3 more
doaj   +1 more source

Wavelet denoising of partial discharge signals and their pattern classification using artificial neural networks and support vector machines

Dyna, 2017
This paper presents two pattern recognition approaches using Partial Discharges fingerprints as input features to classify PD patterns. A multi-layer perceptron (MLP) backpropagation neural network and a support vector machine (SVM) were trained to ...
Ian Carlo Guzmán, Jose Luis Oslinger, Ruben Darío Nieto   +2 more
doaj   +1 more source

Modelling of partial discharge characteristics in electrical tree channels: Estimating the PD inception and extinction voltages

IEEE Transactions on Dielectrics and Electrical Insulation, 2018
Partial discharge (PD) characteristics are inherently linked to associated electrical tree growth characteristics. This paper employs both phase-resolved patterns and pulse-sequence analysis (PSA) to study PDs in a short branch-tree grown from a metallic needle tip.
Lv, Zepeng, Rowland, Simon, Chen, Siyuan, Zheng, Hualong, Wu, Kai   +4 more
openaire   +3 more sources

Detection Technique of Partial Discharges at Impulse Voltage with Appropriate Filter Settings for Signal Separation

Energies, 2019
Due to the increased utilization of electric converters feeding rotating high voltage motors, their insulation is subject to transient impulse and high frequency oscillating voltages.
Karsten Backhaus, Lena Elspaß, Konstantin Pasche   +2 more
doaj   +1 more source

Partial discharge and interference discrimination in gas-insulated systems using electric and magnetic sensors

International Journal of Electrical Power & Energy Systems
The correct identification of partial discharges (PDs) is instrumental for the maintenance plan in gas-insulated systems (GIS). However, onsite PD measurements are difficult, especially in HVDC systems, where partial discharges can be confused with ...
Christian Mier, Armando Rodrigo Mor, Tianming Luo, Peter Vaessen   +3 more
doaj   +1 more source

Interpretation of Partial-Discharge-Activated Frequency Response Analysis for Transformer Diagnostics

Machines
This paper introduces a novel diagnostic approach called partial-discharge-activated impulse frequency response analysis (PD-IFRA), developed to overcome the limitations of conventional frequency response analysis (FRA) in detecting partial discharges ...
Bonginkosi A. Thango
doaj   +1 more source