Results 231 to 240 of about 75,526 (309)

Study of Ultra High Frequency Measurement Techniques for Online Monitoring of Partial Discharges in High Voltage Systems

IEEE Sensors Journal, 2022
Partial Discharge (PD) activity is a pre-cursor for insulation degradation which may eventually lead to catastrophic failure of the electrical equipment with severe social and economic consequences.
K. C. Ghanakota, Y. R. Yadam, Sarathi Ramanujan, V. J., K. Arunachalam   +4 more
semanticscholar   +1 more source

Partial Discharges in HVDC Cables - The Effect of the Temperature Gradient During Load Transients

IEEE transactions on dielectrics and electrical insulation, 2021
The paper investigates the role of the space charge accumulation phenomena in the inception of Partial Discharges (PD) in a defect within the bulk of the dielectrics of a High Voltage Direct Current (HVDC) cable. It is widespread accepted that the number
G. Rizzo, P. Romano, A. Imburgia, G. Ala
semanticscholar   +1 more source

An Ultrawideband Conical Monopole With Radome for Detection of Partial Discharges

IEEE Sensors Journal, 2021
Localized electric field strength in high-voltage (HV) equipment results in electrical discharges which radiate electromagnetic waves in ultrahigh frequency (UHF) range of 0.3-3 GHz.
Y. R. Yadam, S. Ramanujam, K. Arunachalam   +2 more
semanticscholar   +1 more source

Separation of Partial Discharges Sources and Noise Based on the Temporal and Spectral Response of the Signals

IEEE Transactions on Instrumentation and Measurement, 2021
The insulation systems of equipment, cables, and electrical machines subjected to high voltage are continuously exposed to multiple aging mechanisms of electrical, mechanical, thermal, and environmental type.
J. Ardila-Rey, R. Schurch, N. Poblete, Suganya Govindarajan, Osvaldo Muñoz, B. A. de Castro   +5 more
semanticscholar   +1 more source

Optimal frequency selection for detection of partial discharges in power transformers using the UHF measurement technique

, 2021
Electromagnetic (EM) wave propagation in the ultrahigh frequency (UHF) range, generated by partial discharges (PD) is widely employed for monitoring and diagnostic purposes in the field of gas-insulated substations for over a decade.
M. A. Azirani, M. Ariannik, P. Werle, A. Akbari   +3 more
semanticscholar   +1 more source

Classification and comparison of AC and DC partial discharges by pulse waveform analysis

, 2021
This study aims to classify and compare AC and DC partial discharge (PD) based on PD pulse waveform analysis. To achieve this goal, we designed a testbed that enables precise measurements of individual PD pulses.
Mojtaba Rostaghi-Chalaki, K. Yousefpour, J. Kluss, M. Kurum, J. P. Donohoe, Chanyeop Park   +5 more
semanticscholar   +1 more source

Modeling of partial discharge (PD) for solid insulation with void and building a hardware setup to measure partial discharge

2016 Biennial International Conference on Power and Energy Systems: Towards Sustainable Energy (PESTSE), 2016
In high voltage (HV) electrical power systems; varieties of materials (solid, liquid and gaseous) are used for insulation purpose to protect the early failure in High Voltage power equipment. Most of insulating materials are not perfect in all respect and contain some impurities.
Devendra Gowda, null Anandraj
openaire   +1 more source

Partial discharge. VI: PD testing of printed circuit boards

IEEE Electrical Insulation Magazine, 1991
For pt.V see ibid., vol.7, no.2, p.28 et seq. (1991). The results of a research program concerned with applying partial-discharge (PD) testing to the nondestructive evaluation of the dielectric characteristics of coated printed circuit board (PCB) systems that must meet the high-voltage dielectric test requirements of low-voltage equipment are reported.
H. Koch, W. Pfeiffer, H. Reinhard, H. Safran   +3 more
openaire   +1 more source

Partial discharge. VIII. PD testing of solid dielectric cable

IEEE Electrical Insulation Magazine, 1991
For pt.VII see ibid., vol.7, no.4, p.9 (1991). The development of solid dielectric cable is discussed and its potential defects are described. Limitations to partial discharge (PD) measurement and testing are discussed, and its use for detecting cavities (also referred to as voids), which are probably the most common defect in solid dielectric cable ...
J.C. Chan, P. Duffy, L.J. Hiivala, J. Wasik   +3 more
openaire   +1 more source

Experiences in on-site partial discharge measurements and prospects for PD monitoring

2008 International Conference on Condition Monitoring and Diagnosis, 2008
With four case studies (dry-type transformer, power transformer, GIS, generator) this paper describes the principle of synchronous multi-channel PD measurements and its benefits for PD data evaluation. With respect to monitoring the tracing of a charge value as QIEC over the measuring time is not sufficient to assess the PD activity of an HV apparatus.
K. Rethmeier, M. Kruger, A. Kraetge, R. Plath, W. Koltunowicz, A. Obralic, W. Kalkner   +6 more
openaire   +1 more source