On the use of monopole antennas for determining the effect of the enclosure of a power transformer tank in partial discharges electromagnetic propagation

Albarracin Sanchez, Ricardo and Ardila-Rey, Jorge Alfredo and Mas’ud, Abdullahi Abubakar (2016). On the use of monopole antennas for determining the effect of the enclosure of a power transformer tank in partial discharges electromagnetic propagation. "Sensors", v. 16 (n. 2); pp. 148-165. ISSN 1424-8220. https://doi.org/10.3390/s16020148.

Description

Title: On the use of monopole antennas for determining the effect of the enclosure of a power transformer tank in partial discharges electromagnetic propagation
Author/s:
  • Albarracin Sanchez, Ricardo
  • Ardila-Rey, Jorge Alfredo
  • Mas’ud, Abdullahi Abubakar
Item Type: Article
Título de Revista/Publicación: Sensors
Date: January 2016
Volume: 16
Subjects:
Freetext Keywords: Power transformer tank; VHF and UHF sensors; Monopole antennas; Partial discharges; Condition monitoring
Faculty: E.T.S.I. Diseño Industrial (UPM)
Department: Ingeniería Eléctrica, Electrónica Automática y Física Aplicada
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

A well-defined condition-monitoring for power transformers is key to implementing a correct condition-based maintenance (CBM). In this regard, partial discharges (PD) measurement and its analysis allows to carry out on-line maintenance following the standards IEC-60270 and IEC-60076. However, new PD measurements techniques, such as acoustics or electromagnetic (EM) acquisitions using ultra-high-frequency (UHF) sensors are being taken into account, IEC-62478. PD measurements with antennas and the effect of their EM propagation in power transformer tanks is an open research topic that is considered in this paper. In this sense, an empty tank model is studied as a rectangular cavity and their resonances are calculated and compared with their measurement with a network analyser. Besides, two low cost improved monopole antennas deployed inside and outside of the tank model capture background noise and PD pulses in three different test objects (Nomex, twisted pair and insulator). The average spectrum of them are compared and can be found that mainly, the antenna frequency response, the frequency content distribution depending on the PD source and the enclosure resonances modes are the main factors to be considered in PD acquisitions with these sensors. Finally, with this set-up, it is possible to measure PD activity inside the tank from outside.

More information

Item ID: 48832
DC Identifier: http://oa.upm.es/48832/
OAI Identifier: oai:oa.upm.es:48832
DOI: 10.3390/s16020148
Official URL: http://www.mdpi.com/1424-8220/16/2/148
Deposited by: Memoria Investigacion
Deposited on: 21 Dec 2017 08:42
Last Modified: 21 Dec 2017 08:42
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