Partial discharges are not only a consequence but a symptom of insulation degradation in electrical equipment. Partial discharges are revealed outside the insulation as very narrow high-frequency pulses that were superimposed to the grid frequency high-level voltages or currents and thus are fairly hard to detect. This paper presents an application of a new inductively coupled sensor that allows these signals to be measured in an accurate inexpensive manner. The sensor model and its frequency and geometry-dependent behavior are studied to increase the probe sensitivity as much as possible. Its measuring capability in real insulation systems that were subjected to high partial discharge activity will be tested.
"This makes difficult the interpretation of the PD pattern and the diagnosis of the insulation. PD recognition is done by analysing PD pulse waveforms acquired with inductive devices as High Frequency Current Transformers (HFCT), Rogowski Coils or inductive loops , , . In any case, these measurements require the disconnection of electrical equipment before installing the measurement setup. "
[Show abstract][Hide abstract] ABSTRACT: Partial discharge (PD) detection is a widely extended technique for electrical insulation diagnosis. Ultrahigh-frequency detection techniques appear as a feasible alternative to traditional methods owing to their inherent advantages such as the capability to detect PDs online and to locate the piece of equipment with insulation problems in substations and cables. In this paper, four antennas are thoroughly studied by means of their theoretical and experimental behavior when measuring electromagnetic pulses radiated by PD activity. The theoretic study of the band of frequencies in which the pulse emits and the measurement of the parameters S11 are complemented with the frequency response and wavelet transform of a set of 500 time signals acquired by the antennas, and the results are analyzed in detail.
IEEE Transactions on Instrumentation and Measurement 05/2013; 62(5):932-941. DOI:10.1109/TIM.2012.2223332 · 1.79 Impact Factor
"As PDs detection is usually made in industrial environments where electrical noise is present, advanced noise rejection techniques are necessary for PDs measurement and interpretation . Following this trend, pulse waveforms analysis is recently used to help in noise separation and classification -. These processes require the use of wider band acquisition data systems and sensors (up to 50 MHz). "
[Show abstract][Hide abstract] ABSTRACT: Partial Discharges (PDs) are responsible for unexpected failures in power system equipment, so their measurement is a fundamental tool for electrical equipment maintenance. In order to characterize PDs activity, some statistical magnitudes are necessary. For this purpose, PDs acquisition and processing is an important tool for critical decisions related to power systems. In this paper, the main difficulties and challenges facing PDs detection, acquisition and processing are presented. Results will be compared to a commercial PDs detection system.
Instrumentation and Measurement Technology Conference (I2MTC), 2012 IEEE International; 05/2012
[Show abstract][Hide abstract] ABSTRACT: Measuring fast current pulses requires devices with ample broad bands. The approach of this paper is to present a simple sensor based on the Faraday's Law together with an integrating and amplifying stage. Its validation is done by means of the detection of Partial Discharges (PD) in electric insulation systems following the guidelines given in the standard IEC 60270. These measurements are also taken with a high frequency current transformer with the aim of comparing the results obtained with the proposed probe.
Instrumentation and Measurement Technology Conference (I2MTC), 2010 IEEE; 06/2010
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