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Sensors 2014, 14(2), 3408-3427; doi:10.3390/s140203408
Article

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

, * ,
 and
Escuela Politécnica Superior, Departamento de Ingeniería Eléctrica, Universidad Carlos III de Madrid, Avenida de la Universidad 30, Leganés, Madrid 28911, Spain
* Author to whom correspondence should be addressed.
Received: 27 December 2013 / Revised: 30 January 2014 / Accepted: 17 February 2014 / Published: 19 February 2014
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain 2013)
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Abstract

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. Among them, spectral power ratio representation shows great flexibility in the separation of the sources of PD. Mapping spectral power ratios in two-dimensional plots leads to clusters of points which group pulses with similar characteristics. The position in the map depends on the nature of the partial discharge, the setup and the frequency response of the sensors. If these clusters are clearly separated, the subsequent task of identifying the source of the discharge is straightforward so the distance between clusters can be a figure of merit to suggest the best option for PD recognition. In this paper, two inductive sensors with different frequency responses to pulsed signals, a high frequency current transformer and an inductive loop sensor, are analyzed to test their performance in detecting and separating the sources of partial discharges.
Keywords: partial discharges; noise separation; spectral power ratios; high frequency current transformers; inductive sensors partial discharges; noise separation; spectral power ratios; high frequency current transformers; inductive sensors
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Ardila-Rey, J.A.; Rojas-Moreno, M.V.; Martínez-Tarifa, J.M.; Robles, G. Inductive Sensor Performance in Partial Discharges and Noise Separation by Means of Spectral Power Ratios. Sensors 2014, 14, 3408-3427.

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