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IEEE Transactions on Electrical Insulation

Issue 6 • Dec 1993

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Displaying Results 1 - 20 of 20
  • Classification of partial discharges

    Publication Year: 1993, Page(s):917 - 931
    Cited by:  Papers (156)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1020 KB)

    For a long time, classification of partial discharges was performed by eye, by studying discharge patterns at the ellipse of an oscilloscope screen. The introduction of digital processing techniques allowed automation of the recognition procedure. These procedures are reported and applied to a number of actual HV constructions which suffer from partial discharges. The results of these tests show t... View full abstract»

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  • Detection and location of internal defects in the insulation of power transformers

    Publication Year: 1993, Page(s):1057 - 1067
    Cited by:  Papers (39)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    With the development of fast, and low-cost analog-digital converters (ADCs) and new mathematical procedures for waveform description, e.g., time encoded signal processing and recognition (TESPAR), novel approaches to detect and locate internal defects in the insulation of power transformers become feasible if the following requirements are fulfilled: the equivalent circuit of the insulating system... View full abstract»

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  • The effect of the definition used in measuring partial discharge inception voltages

    Publication Year: 1993, Page(s):1002 - 1006
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    At present, several definitions of partial discharge inception voltage (PDIV) have been advanced. To establish the value of each of these definitions, four practical electrical insulating fluids are selected, and their PDIV is determined according to three of these different specifications. The results suggest that the use of PDIV as a quality criterion generally is not warranted. The significance... View full abstract»

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  • Importance of unraveling memory propagation effects in interpreting data on partial discharge statistics

    Publication Year: 1993, Page(s):905 - 916
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (856 KB)

    The significance of memory propagation in controlling the stochastic behavior of partial-discharge phenomena is demonstrated by determination of various conditional amplitude and phase-of-occurrence distributions for both measured and simulated discharge pulses. A system that can be used to measure directly a set of both conditional and unconditional pulse amplitude and phase distributions needed ... View full abstract»

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  • Measuring the endurance of films in partial discharges

    Publication Year: 1993, Page(s):1050 - 1056
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    A new test assembly for measuring the endurance of polymeric and ceramic films under the action of partial discharges (PDs) is presented. If experiments are performed under controlled ambient conditions (i.e., relative humidity), the test procedure gives times to breakdown which show low scatter. The effects of different test conditions on the times to breakdown and relevant data scatter are prese... View full abstract»

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  • Neural networks as a tool for recognition of partial discharges

    Publication Year: 1993, Page(s):984 - 1001
    Cited by:  Papers (95)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1240 KB)

    The application of three different neural networks (NNs) to the recognition of partial discharge (PD) is studied. Results of PD measurements on simple two-electrode models, as well as on models of artificial defects in industrial objects, are presented. The PDs are measured using conventional discharge detection, and PD patterns are processed by previously developed statistical tools. Mathematical... View full abstract»

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  • Pulse height analysis of partial discharges in air

    Publication Year: 1993, Page(s):932 - 940
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The pulse height distribution (PHD) functions of partial discharges (PDs) generated by AC voltage in air are investigated. The electrode systems used allow the investigation of single-source PDs and/or multiple-source discharges. Because voltage and the electrode configuration alter the PHD functions of even a single PD source, the overall effect of voltage an multiple-source discharges is rather ... View full abstract»

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  • Partial discharge measurements using tailored excitation waveforms

    Publication Year: 1993, Page(s):1068 - 1074
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    This paper proposes that the injection of an impulse, at a suitable time on a power frequency voltage wave, can trigger the inception of partial discharges. In this way a deterministic component is introduced into the observation of partial discharge activity and the ability to minimize the influence of noise in a measurement is enhanced considerably. Two simple experiments are described which dem... View full abstract»

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  • The relation between thermal and electrical stress and the PD behavior of epoxy-resin transformers

    Publication Year: 1993, Page(s):1007 - 1015
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    The partial discharge (PD) behavior of epoxy resin transformer coils in a temperature range between -30 and 180°C is discussed. In particular, the PD inception voltage, which is a very important parameter for the judgement of the PD characteristic of a transformer over the temperature range, is considered. The PD inception voltage is determined at different static temperatures in step tests. T... View full abstract»

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  • Partial discharges and streamers in liquid dielectrics-the significance of the inception voltage

    Publication Year: 1993, Page(s):941 - 946
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    Recent studies have determined the partial discharge inception voltage (PDIV) of several practical insulating oils using conventional PD measurements. They show that the PDIV is a reasonably reproducible quantity. Independently, using electrooptical techniques, the streamer inception voltages (SIVs) in these liquids have been measured. These SIV values are found to be reproducible, within experime... View full abstract»

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  • The definitions used for partial discharge phenomena

    Publication Year: 1993, Page(s):1075 - 1081
    Cited by:  Papers (23)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    A variety of definitions related to partial discharge (PD) phenomena are discussed. There is no general agreement at this time of writing as to the definitions of the various regimes of PD. A certain confusion exists which may be due to the multitude of PD manifestations. An attempt is made to elucidate some aspects of the PD definitions. Related problems needing more work are noted View full abstract»

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  • Diagnosis of partial discharge signals using neural networks and minimum distance classification

    Publication Year: 1993, Page(s):1016 - 1024
    Cited by:  Papers (51)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    Two different methods for classifying partial discharge (PD) phenomena by a personal-computer-aided system are described. The first is concerned with common minimum distance classification, using statistical data on pulse quantities such as apparent charge, energy and phase. Applying the correct algorithms and features, such a system is able to discriminate between unknown defects using convention... View full abstract»

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  • Partial discharge measurements in dielectric liquids under impulse voltage

    Publication Year: 1993, Page(s):947 - 955
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (856 KB)

    Current pulses caused by partial discharges (PDs) are measured using light-emitting diodes (LEDs) and fiber optics under impulse voltage conditions. This system has the advantage of having good isolation from the HV power supply and no effect from electromagnetic noise as compared with ordinary systems. It can detect a PD pulse having a half width of 3 ns, and has the capability of measuring PD pu... View full abstract»

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  • PD pattern recognition with neural networks using the multilayer perceptron technique

    Publication Year: 1993, Page(s):1082 - 1089
    Cited by:  Papers (46)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB)

    The partial discharge (PD) pattern recognition capability of a neural network, employing the multilayer perceptron technique with data input based on five discharge pulse form parameters, is examined. Simple discharge sources, consisting of artificially created cylindrical cavities with metallic and dielectric electrodes, are employed. The PD pattern discrimination capability is tested using cavit... View full abstract»

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  • Digital measurement of partial discharges in full-sized power capacitors

    Publication Year: 1993, Page(s):1025 - 1032
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    Partial discharges measurements in power capacitors have been carried out using a digital technique. The advantages of the use of this digital technique are discussed. The digital equipment design is presented. Test results on industrial all-film power capacitors with high capacitance values are presented together with measurements of the PDIV before and after the endurance tests View full abstract»

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  • Present state and prospects of standardization on PD measurements

    Publication Year: 1993, Page(s):902 - 904
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The contents of the past and present IEC Standards on partial discharge (PD) measurements are examined, in view of the preparation of a new edition. New standards should take into account the more sophisticated measuring systems produced in the last decades and their lower sensitivity to external disturbances. Little knowledge has however been added on the PD aging effects on HV apparatus View full abstract»

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  • On the character of different forms of partial discharge and their related terminologies

    Publication Year: 1993, Page(s):956 - 968
    Cited by:  Papers (66)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (880 KB)

    Experimentally obtained partial discharge pulse forms are compared with those derived theoretically, using a mathematical model of a short gap. The calculations indicate that, with overvolted short gaps, the apparent absence of the protracted ion current tail in the overall pulse form is due to the large excess of the electron current component generated by strongly enhanced cathode emission by th... View full abstract»

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  • A critique of present calibration procedures for partial discharge measurements

    Publication Year: 1993, Page(s):1043 - 1049
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The need for improved standardization procedures for use on different types of partial discharge (PD) measuring systems is discussed. This requirement is examined using recording and processing data of complex PD signals obtained from in-service electrical apparatus. It is concluded that more fundamental knowledge of the PD mechanisms must be gained before any significant changes in existing calib... View full abstract»

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  • Computer-aided measurement of partial discharges in HV equipment

    Publication Year: 1993, Page(s):969 - 983
    Cited by:  Papers (145)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    A previously developed method of partial discharge (PD) recognition is used to evaluate PD in HV devices. Using conventional discharge detection (bandwidth ~400 kHz), the PD patterns are studied. By means of unambiguous statistical operators like skewness, kurtosis, number of peaks, etc., quantitative information about the discharge source can be obtained. In the case of an unknown defect, a combi... View full abstract»

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  • PD analysis of rotating AC machines

    Publication Year: 1993, Page(s):1033 - 1042
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (644 KB)

    The problem of the interpretation of partial discharge (PD) measurements is approached by means of the shape analysis of PD amplitude distributions. Experimental cumulative PD distributions, detected insulation systems of HV rotating machine stator windings, are plotted on a Weibull graph in order to identify multiple PD sources. Examples of the application of PD distribution shape analysis as a d... View full abstract»

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Aims & Scope

This Transactions ceased production in 1993. The current retitled publication is  IEEE Transactions on Dielectrics and Electrical Insulation.

Full Aims & Scope