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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Patent•
21 May 1997TL;DR: In this paper, a pair of semi-circular discs combined on a plane inside the metal vessel of a gas-insulated apparatus is used to detect electromagnetic signals generated by partial discharge.
Abstract: Electromagnetic waves generated by partial discharge occurring when gas-insulated apparatus fails are detected by using a compact, wide band and high sensitivity antenna. Electromagnetic waves produced by partial discharge are detected over a wide range with a high sensitivity by a circular antenna receiver (4) which comprises a pair of semi-circular discs combined on a plane inside the metal vessel (3) of the gas-insulated apparatus. The detected signal is measured by a measuring instrument (10) through a coaxial enclosed terminal (7) and a coaxial cable (8). Since the area of the semi-circular antenna unit is large, the capacitance between the antenna unit and a potential measuring unit can be large, so that the high sensitivity potential measurement can be also performed.
51 citations
01 Jan 1995
TL;DR: In this article, a neural network algorithm has been used especially to discriminate PD signals from noise signals for insulation diagnosis, which has been enabled by the recent development of microprocessors or the downsizing of computers.
Abstract: Statistical data analysis has been recently requisite for partial discharge (PD) study. This has been enabled by the recent development of microprocessors or the downsizing of computers. It is important to pay more attention to profiles of a packet of PD pulses on the voltage phase angle. Statistical parameters such as skewness and kurtosis have been intensively investigated for PD analysis. More recently, the neural network algorithm has been utilised especially to discriminate PD signals from noise signals for insulation diagnosis.
51 citations
Patent•
29 Mar 1996TL;DR: A corona discharge ionization source, for use for example with an ion mobility spectrometer, comprises an adjustable corona point electrode (20) which is held transversely within a cylindrical target electrode (14), producing a constant or pulsed potential difference between the two electrodes as mentioned in this paper.
Abstract: A corona discharge ionization source, for use for example with an ion mobility spectrometer, comprises an adjustable corona point electrode (20) which is held transversely within a cylindrical target electrode (14). A corona discharge is produced by a constant or pulsed potential difference between the two electrodes. In alternative embodiments, there may be a further corona discharge electrode (58), providing additional control, and also an annular counterelectrode (60) surrounding the further point electrode (58).
51 citations
TL;DR: In this article, a simulation model representing PD behavior within spherical cavities in homogeneous dielectric materials has also been developed, which has been used to study the influence of cavity size and material temperature on PD activity.
Abstract: For high-voltage components, the measurement of partial discharge (PD) is a useful tool for performance assessment of electrical insulation. In this study, experimental measurements of PD activity for different spherical cavity sizes and material temperatures have been performed. A simulation model representing PD behaviour within spherical cavities in homogeneous dielectric materials has also been developed. The model has been used to study the influence of cavity size and material temperature on PD activity. Comparison of measurement and simulation results has been undertaken. The model uses a finite element analysis (FEA) method along with MATLAB code. It has been found that certain parameters in the model are both cavity size and temperature dependent. Thus, critical parameters influencing PD behaviour for different cavity sizes within the material and material temperatures can be identified; these are the charge decay time constant, cavity surface conductivity, electron generation rate (EGR), PD inception and extinction fields and the cavity temperature decay time constant.
51 citations