Journal ArticleDOI
Challenges in calibration of the measurement of partial discharges at ultrahigh frequencies in power transformers
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TLDR
In this paper, the detection and measurement of partial discharge (PD) is a well-known method for evaluating the insulation performance of power transformers, and the apparent charge is measured in a frequency range below 1 MHz using an electrical circuit which quantifies only a portion of the discharge energy conducted to the PD detector through the conductors.Abstract:
The detection and measurement of partial discharge (PD) is a well-known method for evaluating the insulation performance of power transformers. According to the IEC 60270 standard, the apparent charge is measured in a frequency range below 1 MHz using an electrical circuit which quantifies only a portion of the discharge energy conducted to the PD detector through the conductors. However, it is also well known that the PD energy is not only conducted but also transmitted via electromagnetic (EM) and optic waves, acoustic waves, and thermal energy.read more
Citations
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Journal ArticleDOI
Application of UHF Sensors in Power System Equipment for Partial Discharge Detection: A Review
TL;DR: The aim of this review was to present state-of-the-art UHF sensors in PD detection and facilitate future improvements in the UHF method.
Proceedings ArticleDOI
A review of partial discharge detection, diagnosis techniques in high voltage power cables
TL;DR: In this article, a general review on partial discharge in power cables is provided, which discusses the importance of partial discharge detection and its effect on the continuity of operation and reliability of power systems.
Journal ArticleDOI
Design and Development of a Bio-Inspired UHF Sensor for Partial Discharge Detection in Power Transformers.
Luiz Augusto Medeiros Martins Nobrega,George Victor Rocha Xavier,Marcus V. D. Aquino,Alexandre Jean Rene Serres,Camila Caroline Rodrigues de Albuquerque,Edson Guedes da Costa +5 more
TL;DR: The experimental tests demonstrated the effectiveness of the sensor for detecting PD signals with apparent charge values higher than 35 pC and the antenna sensitivity for denominated partial discharge (PD) detection was compared with the IEC 60270 standard method.
Journal ArticleDOI
UHF PD measurements on power transformers-advantages and limitations
TL;DR: Each of the mentioned sections of Ultra-High Frequency (UHF) Partial Discharge measurements on power transformers is investigated in detail by simulation analysis or laboratory measurements, leading to a more precise measurement, more accurate analysis of UHF PD data and solving some of the problems associated with it.
Journal ArticleDOI
Statistics based method for partial discharge identification in oil paper insulation systems
TL;DR: Attempt of discriminative descriptors selection for partial discharge source analysis in on-site transformer applications as well as a proposal of unique descriptors according to every selected spark gap configuration that could be potentially useful forpartial discharge identification purposes are the main purpose of the presented paper.
References
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Journal ArticleDOI
Partial discharge monitoring of power transformers using UHF sensors. Part I: sensors and signal interpretation
TL;DR: In this article, the propagation velocity matrix (PVM) and propagation time matrix (PTM) were introduced to detect partial discharge (PD) in power transformers, which can be used to index a database of physical descriptions of the transformer that could provide additional information to assist with diagnosis.
Journal ArticleDOI
A compact antenna for ultrawide-band applications
Nader Behdad,Kamal Sarabandi +1 more
TL;DR: In this paper, a compact and ultrawide-band (UWB) antenna with a VSWR of lower than 2.2 (S/sub 11/<-8.5 dB) across an 8.5:1 frequency range is presented.
Journal ArticleDOI
A pulsed GTEM system for UHF sensor calibration
Martin D. Judd,O. Farish +1 more
TL;DR: A system for measuring the sensitivity of electric field sensors at UHF using a novel gigahertz transverse electromagnetic (GTEM) cell is described to enable calibration of UHF couplers that are used to detect insulation defects in gas insulated substations.
Journal ArticleDOI
Transfer function-based partial discharge localization in power transformers: a feasibility study
TL;DR: In this paper, the authors investigated the use of SWTFs for supervising the conditions of transformer units and proposed a method based on traveling wave theory to search for the optimum parameters of a partial differential equation.
Journal ArticleDOI
Advancing new techniques for UHF PDdetection and localization in the power transformers in the factory tests
TL;DR: In this paper, a new design of UHF antennas is introduced which is suitable to be used on the transformers in the HV laboratories of the manufacturers to ensure the applicability of the new antenna, experimental UHF PD measurements are carried out on a transformer tank model as well as on real power transformers.