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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20 Feb 2007TL;DR: In this article, a rod antenna is installed around the power line or neutral point lead line in the metal frame to electrostatically and magnetically induce the partial discharge signal propagated to the power lines or neutral points lead line, and a detector is used to detect partial discharge by signal processing.
Abstract: A partial discharge detection apparatus of an electrical rotating machine includes a metal frame connected to a stator frame of the electrical rotating machine, a power line connected to one of a stator winding corresponding to one phase of three phases in the metal frame and a neutral point lead line connected to a neutral point of three-phase stator windings and arranged in the metal frame to propagate a partial discharge signal generated by degradation of the stator winding, a sensor including a rod antenna which is installed around the power line or neutral point lead line in the metal frame to electrostatically and magnetically induce the partial discharge signal propagated to the power line or neutral point lead line, and a detector which receives, via a signal lead line, a signal generated in the sensor and detects partial discharge by signal processing.
29 citations
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TL;DR: In this paper, the problem of the interpretation of partial discharge (PD) measurements is approached by means of the shape analysis of PD amplitude distributions, and the calibration procedure and significance of average parameters for degradation inference are reviewed.
Abstract: 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 diagnostic tool for AC HV stator insulation systems are presented and discussed. The calibration procedure and the significance of average parameters for degradation inference are reviewed. >
29 citations
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TL;DR: In this paper, a TJ model was used to study the characteristic of partial discharge (PD) signals under four types of impulse voltages were detected by electrical methods and the results indicated that the PD signals under impulse voltage can be detected using electrical method, the number of discharges under oscillating impulse voltage was significantly larger, which was due to the influence of source oscillation.
Abstract: Gas insulated switchgears (GIS) have been widely used due to their high reliability, low maintenance and compact size. The field experiment is an important step to ensure the safety of GIS. The AC withstand voltage test and its corresponding partial discharge (PD) measurement are inadequate for the detection of all the hidden flaws in GIS. Such inadequacy can be compensated by additional impulse withstand voltage test and its PD detection measurement. This paper reports on experiments to study surface discharge over SF6/epoxy under impulse voltage. The TJ (triple-junction) model was used to study the characteristic of partial discharge (PD). The PD signals under four types of impulse voltages were detected by electrical methods. The 50% probability PD inception voltage (PDIV50), time lags and maximum discharge magnitude were analyzed as a function of gas pressure. The PD characteristics under AC voltage were investigated for comparison. The results indicate that the PD signals under impulse voltage can be detected using electrical method, the number of discharges under oscillating impulse voltage was significantly larger, which was due to the influence of source oscillation. The oscillating lightning impulse has the lowest impulse ratio and it is recommended as the best test waveform choice for the field impulse withstand test with PD detection.
29 citations
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TL;DR: In this article, the stator bar insulation system must be designed for minimum partial discharge activity and ideally is corona free at stator winding operating stress levels, and at the operating conditions (temperature and pressure) the generator is subject to.
Abstract: High voltage stator windings in modern electric generators are subject to high electrical, mechanical, and thermal stress. Operation of these machines in both air and high pressure hydrogen results in different considerations. Operation in the air environment does not offer the dielectric advantages of operating in high-pressure hydrogen. The two major design factors that are significant for the design of high voltage stator bars to be operated in air, are corona activity and PD activity. These of course are closely related. With the movement to increasing the power density of generators, which means operation at higher voltages and higher insulation stress levels, it has become more critical to be sure the design constraints are met in the stator bar design to minimize both partial discharge activity and corona activity involving the stator bars. The stator bar insulation system must be designed for minimum partial discharge activity and ideally is corona free at the stator winding operating stress levels, and at the operating conditions (temperature and pressure) the generator is subject to. This paper will present the findings associated with the development work in designing, testing and implementing a PD reduced and corona free design.
29 citations
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07 Jun 1992
TL;DR: In this article, the effects of electrical and physical length and pulse risetime on the propagation characteristics of motor stator windings were investigated and the results indicated that these measurements are often not as accurate as may be assumed.
Abstract: An investigation of the pulse propagation characteristics of motor stator windings is reported. The results indicate the effects of electrical and physical length and pulse risetime on the propagation characteristics. They explain the observed phenomena and place them in the context of partial discharge measurement techniques as used to assess the integrity of solid insulating systems of a high-voltage rotating plant. Such assessments can only be correct if the discharge measurements on which they are based are accurate. The results indicate that these measurements are often not as accurate as may be assumed. >
29 citations