Partial discharge detection by extracting UHF signal from inner grading electrode of insulating spacer in GIS

Shao, Xi; He, Wen-Lin; Xu, Jialong; Zhu, Ming-Xiao; Zhang, Guanjun

doi:10.1049/iet-smt.2016.0419

Cited by 10 publications

(6 citation statements)

References 17 publications

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“…The PRPD patterns discharges that occurred in positive half cycle and negative half cycle were 605 and 538, respectively for both UHF sensors. The discharge magnitude of positive and negative Corona discharges is almost similar as reported by Xian-Jun Shao et al for protrusion defect on HV conductor in 252 kV GIS [25]. Ju Tang et al simulated protrusion defect in test cell for PD severity assessment and observed similar PRPD pattern when PD intensity is at normal level [26].…”

Section: Phase Resolved Partial Discharge Analysissupporting

confidence: 78%

Planar Ultrawideband Circularly Polarized Cosine Slot Archimedean Spiral Antenna for Partial Discharge Detection

2022

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Design and experimental verification of an ultrawideband planar circularly polarized ultrahigh frequency (UHF) sensor is presented for detection of partial discharge (PD) activities in high voltage (HV) equipment. The proposed sensor is cavity-backed cosine slot Archimedean spiral (CSAS) antenna with an electromagnetic (EM) transparent radome. The dual-arm slot spiral was meandered as cosine wave for size reduction and optimized for broadband operation with circular polarization (CP) over 0.5-5 GHz. Unidirectional radiation pattern with CP was achieved over 0.5-5 GHz using an optimized cavity loaded with EM absorber. The fabricated UHF CSAS sensor has the widest operating bandwidth of 0.5-5 GHz with circular polarization and the smallest aperture of 0.26λ L when compared to the existing UHF PD sensors, where λ L is the wavelength at the lowest operating frequency. Time domain incipient discharge signals and phase resolved PD patterns gathered for three commonly occurring defects in test cells mimicking gas insulated switchgear (GIS) indicate better sensitivity and detection capability for the fabricated CSAS UHF sensor than the reference PD sensor. PD signal measurements and comparison with other UHF PD sensors indicate that the proposed UHF CSAS sensor could be used for PD detection in HV equipment.INDEX TERMS Circular polarization, high voltage, gas insulated switchgear, partial discharge, spiral antenna, ultrawideband, ultrahigh frequency.

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Section: Phase Resolved Partial Discharge Analysissupporting

confidence: 78%

Planar Ultrawideband Circularly Polarized Cosine Slot Archimedean Spiral Antenna for Partial Discharge Detection

2022

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“…Secondary electron emission plays major role in consistent occurrence of negative corona discharge. Positive charges accumulated around cathode enhance local electric field and cause higher number of electron avalanches at the same time [136]. Xian-Jun Shao in [136] and Ju Tang in [139] have shown progression of patterns for this defect with voltage rising as shown in Figures 51 and 52.…”

Section: ) Metallic Protrusionmentioning

confidence: 93%

“…During this transition from jumping to the dancing mode, PRPD pattern does not show any clear changes and are not stable; also, PDs are distributed around zero crossing which goes toward the first half of positive and negative cycle of voltage in PRPD pattern and forms more symmetrical pattern (Figure 49). When metallic particles approach and attach HV conductor, PDs ignite with higher intensity at the positive and negative half cycles and reach to the stable and symmetrical condition around the peak of voltage waveform (shuffling) [87,136].…”

Section: ) Free-moving Metallic Particlesmentioning

confidence: 99%

A Review of Knowledge-Based Defect Identification via PRPD Patterns in High Voltage Apparatus

et al. 2021

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Partial discharge (PD) as one of well-known signatures of defects in the insulation system of high voltage equipment has been studied over eight decades. It is of a great interest to power grid operators and owners to identify and distinguish local weak spots in insulation system of the key components of power system by using the obtained PD information to make timely decision thus to avoid any unexpected failures in the system. This article reviews the research progress of PD in high voltage apparatus, including motors and generators, cables, transformers and gas insulated equipment, with attempts to assess the severity of different types of PD initiating defects as well as key PD features that can be selected for classifying defects. Experimental and on-site test results for each type of discharge and defect associated are summarized and discussed. Also, development of these defects during operation of equipment caused by changes in physical and chemical parameters of defect and/or insulation, and its impact on phaseresolved PD pattern variation are thoroughly explained. It is expected that this paper can provide a comprehensive guideline for PD data analysis of available PD information extracted by conventional PD acquisition instruments for both engineers and asset managers of high voltage apparatus. INDEX TERMSPartial Discharge (PD), high voltage motor, power cable, power transformer, GIS, GIL. Tohid Shahsavarian received the Bachelor's degree in Electrical Engineering from the University of Tabriz in 2011, and the Master's degree from the University of Science and Technology (IUST) in 2013. Then, he worked in the Department of Transmission and Distribution in Monenco Iran Consulting Engineers Company.He is currently working toward the Ph.D. degree at the Electrical and Computer Engineering Department of the University of Connecticut, and his research interests include the partial discharge analysis and risk assessment of AC and DC power cables, enhancement of insulation performance in electrical and electronic components for aerospace application, reliability analysis and protection of HVAC/HVDC grids, geomagnetic disturbances (GMD).

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“…The UHF method is an effective PD detection method because of its high detection sensitivity and good antiinterference capacity [6][7][8][9]. However, the accurate PD source location conventionally requires four or more sensors [10,11], but the UHF sensors are usually fixed in the dielectric window on transformer shell or oil valves [12,13], the position and the numbers of UHF sensors are restricted, therefore, the UHF method may face some limitation to the PD location in some cases.…”

Section: Introductionmentioning

confidence: 99%

A novel de‐noising method based on coherence average for ultrasonic signal of partial discharge in transformer

Cheng

Ding

et al. 2021

IET Science Measure & Tech

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Ultrasonic method is widely used for the detection and location of partial discharge (PD) in transformer, however, the measured ultrasonic signal is usually corrupted by noise, and sometimes is even buried by noise entirely. Therefore, the de-noising of the measured signal is essential. Conventional de-nosing methods, such as wavelet method and singular value decomposition (SVD) method, generally require empirical parameter selection or estimation, and the best parameters for de-noising vary with the PD source and noise condition, which will bring some limitation to their applicability. More importantly, conventional de-noising methods usually have poor performance for the low signal-to-noise-ratio (SNR) signals. To improve this problem, the paper proposes a de-noising method based on coherence average for the ultrasonic signal. The de-noising performance of the proposed method is evaluated based on a comparison with conventional methods, the results indicate that the proposed method has great de-noising effect for the ultrasonic signals, even for the low-SNR signals. Besides, the proposed method is free from empirical parameter selection or estimation, which can make its applicability more extensive. The proposed method can offer a practical and effective solution to the de-noising of ultrasonic signal of PD in transformer. 1 This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Partial discharge detection by extracting UHF signal from inner grading electrode of insulating spacer in GIS

Cited by 10 publications

References 17 publications

Planar Ultrawideband Circularly Polarized Cosine Slot Archimedean Spiral Antenna for Partial Discharge Detection

Planar Ultrawideband Circularly Polarized Cosine Slot Archimedean Spiral Antenna for Partial Discharge Detection

A Review of Knowledge-Based Defect Identification via PRPD Patterns in High Voltage Apparatus

A novel de‐noising method based on coherence average for ultrasonic signal of partial discharge in transformer

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