Results 91 to 100 of about 86,487 (250)

Partial Discharge Modelling Based on a Cylindrical Model in Solid Dielectrics

, 2008
Partial discharges (PDs) are harmful to electrical insulation as they may degrade the material. Consequently, a lot of efforts have been made to develop suitable systems for PD measurements and monitoring.
Baharudin, Fauzan, Fauzan Baharudin, George Chen, Chen, George   +3 more
core   +1 more source

A new method for automatic Multiple Partial Discharge Classification

, 2011
A new wavelet based feature parameter have been developed to represent the characteristics of PD activities, i.e. the wavelet decomposition energy of PD pulses measured from non-conventional ultra wide bandwidth PD sensors such as capacitive couplers (CC)
Contin, A., Lewin, P.L., Michel, M, Hao, L, Hunter, Jack, Walton, C, Swaffield, D.J.   +6 more
core  

Simulation of a transformer winding for partial discharge propagation studies

, 2002
A simulation model of a continuous disc type 6.6 kV transformer winding was used to study the propagation behaviour of partial discharge (PD) pulses. The model based on multi-conductor transmission line theory uses a single turn as a circuit element with
Darwin, A., Crossley, P.A., Edwards, G., Hettiwatte, S.N., Wang, Z.D.   +4 more
core  

Partial discharge pulse sequence patterns and cavity development times in transformer oils under ac conditions

, 2005
Discrete partial discharge (PD) pulse occurrence times within the PD pulse bursts in transformer oils were found to extend from approximately 0.42 to 2.9 mu s, with the discrete pulse separation times evincing a weak dependence on the inverse of the oil ...
POMPILI, Massimo, R. Bartnikas, MAZZETTI DI PIETRALATA, Carlo   +2 more
core   +1 more source

PD Detection and Analysis Triggered by Metal Protrusion in GIS Through Various Methods

Applied Sciences
Defects in GIS can be effectively detected by detecting the partial discharge (PD). The common methods of detecting partial discharge are pulse current, ultrasonic and UHF (ultra-high frequency). However, the results of different methods may be different
Weifeng Xin, Wei Song, Manling Dong, Xiaochuan Huang, Xiaoshi Kou, Zhenyu Zhan, Xinyue Shi, Xutao Han   +7 more
doaj   +1 more source

Condition Monitoring of Power Cables

, 2007
A National Grid funded research project at Southampton has investigated possible methodologies for data acquisition, transmission and processing that will facilitate on-line continuous monitoring of partial discharges in high voltage polymeric cable ...
Swaffield, D J, Hao, L, Swingler, S G, Lewin, P L   +3 more
core  

Comparison of partial discharge (PD) calibrators from 0.1 pC to 10 nC

Metrologia
Main text High-voltage partial discharge (PD) tests require calibration of PD measurement systems using PD calibrators which provide known values of the apparent charge. A set of travelling reference calibrators was circulated among 14 participating laboratories and each laboratory reported apparent change and rise time measured using ...
J Klüss, J Hällström, J Havunen, W Yan, J Hlavacek, G Crotti, T Aguado, R Vanconcellos, N Liu, J Meisner, A Merev, M Zeier, M Berginc, G Sadkowski, Y Hadjadj   +14 more
openaire   +1 more source

Modeling of Surface Charge Decay in a Spherical Cavity within a Solid Dielectric Material using Finite Element Analysis

, 2009
The modelling of cavity surface charge decay through conduction along the cavity wall using the Finite Element Analysis (FEA) method is presented in this paper.
Lewin, P L, Illias, H, Chen, G
core  

Partial discharge characteristics of insulation used in inverter-fed traction motor under high frequency impulse

, 2012
Stator insulation in inverter-fed traction motors may prematurely lose its function due to continuous square impulses voltage of converters, whose insulation failure mechanism is different from that under power frequency AC voltage. Partial discharge (PD)
Cao, Kaijiang, Wu, Guangning, Luo, Yang, Cui, Yi   +3 more
core   +1 more source

Analysis of Partial Discharge Measurements using Coupling Capacitor in Rotating Machine [PDF]

Iranian Journal of Electrical and Electronic Engineering
Partial discharge (PD) is a significant concern in the operation of rotating machines such as generators and motors, as it can lead to insulation degradation over time, reducing the reliability and lifespan of the machines.
Ahmad Syukri Abd Rahman, Mohamad Nur Khairul Hafizi Rohani, Nur Dini Athirah Gazata, Afifah Shuhada Rosmi, Ayob Nazmi Nanyan, Aiman Ismail Mohamed Jamil, Mohd Helmy Halim Abdul Majid, Normiza Masturina Samsuddin   +7 more
doaj