Topic
Partial discharge
About: Partial discharge is a research topic. Over the lifetime, 13997 publications have been published within this topic receiving 102058 citations. The topic is also known as: PD.
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TL;DR: This paper investigates methods to detect PD pulses on enameled wires under repetitive impulsive voltages with different rise times of 60, 500, and 1000 ns, proposing techniques which allow separation of PD from noise even when they overlap in time and frequency domains.
Abstract: Partial discharge (PD) detection is a fundamental tool for the design and diagnosis of insulation systems, particularly organic materials that must operate throughout their life without PD. While the methods for PD measurements under sinusoidal supply voltage are well-established, the same does not hold under repetitive-pulse voltage waveforms, such as those provided by inverters. Electromagnetic noise generated by electronic switch commutation in inverters can overlap with PD pulses, making it difficult to measure, separate from noise, and identify PD. This is particularly more cumbersome when fast rise-time switches are employed. To address these issues, this paper investigates methods to detect PD pulses on enameled wires under repetitive impulsive voltages with different rise times of 60, 500, and 1000 ns, proposing techniques which allow separation of PD from noise even when they overlap in time and frequency domains. This paper employs a time-domain approach using standard deviation curve acquired from a set of measurements to discriminate PD from repetitive commutation disturbance. These techniques can be implemented to achieve unsupervised noise rejection, which would be an important goal for both offline and online PD testing. The proposed approach is validated successfully through tests carried out on a low-voltage motor.
36 citations
TL;DR: In this article, the results of partial discharge measurements performed on crossed pairs are presented, highlighting how the differences in the applied voltage waveform can influence the Repetitive Partial Discharge Inception Voltage.
Abstract: This paper reports and discusses qualification and type test procedures for random wound motors as specified in IEC Technical Specification 60034-18-41. Since laboratory tests dealing with off-line partial discharges measurements followed by life tests showed that motors qualified as good can fail in very short times, an extensive investigation on the causes of such discrepancy and, in particular, on the differences existing between the stresses applied during off-line tests and in service is described. In addition, the results of partial discharge measurements performed on crossed pairs are presented, highlighting how the differences in the applied voltage waveform can influence the Repetitive Partial Discharge Inception Voltage. Suggestions to improve the off-line test procedure and related equipment are eventually discussed.
36 citations
TL;DR: In this article, the authors analyzed the discharge progress and its influence on the surface charge build-up, which essentially is the cause of, from a high voltage insulation perspective, a beneficial electric field distribution with lowered electric field in the air gap and enhanced electric fields in the dielectric coatings.
36 citations
20 Oct 1996
TL;DR: In this article, an optical signal is launched periodically into an all-fibre sensor system, and the induced stress on the fibre core caused by the pressure wave perturbation changes the phase of the optical signal traversing the fibre.
Abstract: The insulation system of HV power equipment deteriorates due to partial discharges. It is thus desirable to monitor the insulation of power apparatus whilst in service. Ultrasonic signals generated by the partial discharges in high-voltage power equipment can be detected with suitable pressure transducers and related to the PD (Partial Discharge) source. Acoustooptic sensors have shown high sensitivity and good accuracy of measurement of physical parameters. Optical fibres are chemically inert and do not affect the integrity of the insulation system, hence they provide a suitable means of monitoring of the condition of the HV equipment. An optical signal is launched periodically into an all-fibre sensor system. The induced stress on the fibre core caused by the pressure wave perturbation changes the phase of the optical signal traversing the fibre. The phase shift is detected by using a reflectrometric pulsed interferometer technique with a phase modulated type sensor. The extracted PD signals show a high sensitivity.
36 citations
TL;DR: In this article, a high sensitivity optical fiber sensor for detecting the acoustic emission generated by the partial discharge in gas-insulated switchgear (GIS) was proposed, and the experimental results show that the detectable partial discharge initial voltage for the proposed optical system is 17.1% lower than that for the conventional lead zirconate titanate (PZT) system.
Abstract: We propose a high sensitivity optical fiber sensor for detecting the acoustic emission generated by the partial discharge in gas-insulated-switchgear (GIS). A model is established to investigate the effects of the cylinder coil on the sensitivity, the bandwidth, and the detection limit. After that, the proposed sensor was modified based on the effects. The average sensitivity of the optimized acoustic emission (AE) optical fiber sensor is 32 dB higher than that of the conventional lead zirconate titanate (PZT) in the frequency range from 20 kHz to 100 kHz. Moreover, the experimental results show that the detectable partial discharge initial voltage for the proposed optical system is 17.1% lower than that for the PZT system, and the amplitude of the signal detected by the proposed optical system is 525% higher than that detected by the PZT system.
36 citations