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•
07 Sep 1995TL;DR: In this article, the auxiliary discharge is shielded by a bulkhead and a barrier rib, so that the phosphor does not emit light when only auxiliary discharge occurs, unlike the main discharge.
Abstract: A gas discharge display panel which provides sufficient contrast and good accuracy and is high in yield. When a voltage is applied to auxiliary discharge electrodes, auxiliary discharge occurs in an auxiliary discharge space and excited charged particles communicate with a main discharge space through a priming path made in a discharge space separation bulkhead. In this state, when an alternating voltage is applied between bus electrodes on a front substrate, main discharge occurs in the main discharge space, causing Xe atoms in the sealed gas to generate ultraviolet rays, causing a phosphor to emit light. However, since the auxiliary discharge is shielded by a bulkhead and a barrier rib, the phosphor does not emit light when only auxiliary discharge occurs.
37 citations
TL;DR: In this paper, a large-scale polyvinyl chloride (PVC) nanocomposites for industrial application with power cables were developed with two different loadings of nanoparticles: 0.3 and 0.6 wt%.
Abstract: This study aims to develop large-scale polyvinyl chloride (PVC) nanocomposites for industrial application with power cables. To achieve this goal, PVC/silicon dioxide and PVC/titanium dioxide nanocomposites were fabricated with two different loadings of nanoparticles: 0.3 and 0.6 wt.%, in the presence of a suitable coupling agent that was used to reduce the agglomeration of nanoparticles and enhance the compatibility with polymer matrix. The coupling agent used in this study was the amino silane, and the process followed in the nanocomposites preparation was the melt blending method. The dielectric properties of these synthesised nanocomposites were studied by measuring the AC dielectric breakdown strength under the uniform field, then compared with the simulation results. The relative permittivity ( ɛ r), loss tangent (tan δ ), and DC electrical conductivity ( σ ) were also measured under frequencies ranging from 20 Hz to 1 MHz. In addition, the internal discharge measurements are performed using the traditional needle-plane configuration with the help of phase-resolved partial discharge (PD) analyser. This technique is used to analyse the PDs activity with respect to the phase angle of the applied voltage. It was found that the dielectric breakdown strength and PD resistance of the prepared samples are increased higher than that of the neat PVC; however, the ɛ r, tan δ , and σ at 50 Hz are decreased.
37 citations
TL;DR: In this paper, the wavelet packets analysis was used as a tool for disk-to-disk partial discharge faults detection and localization in transformer windings, and a simulated model was developed for the transformer winding and the PD phenomenon mechanism.
37 citations
TL;DR: In this paper, the authors proposed that wires of a resistance temperature detector (RTD) embedded in a stator slot are applied as a partial discharge sensor in the form of an RF coupler.
Abstract: On-line partial discharge tests for turbine generators are useful for recognizing abnormal or deteriorated stator winding insulation without a machine outage. One problem related to such a test is additional installation of sensors. We propose that wires of a resistance temperature detector (RTD) embedded in a stator slot are applied as a partial discharge sensor in the form of an RF coupler. The other problem is electrical noise that is a pulse similar to partial discharge in frequency characteristic and has higher amplitude than partial discharge. The sensors in two steam turbine generators showed enough sensitivity and broad frequency bandwidth to facilitate the elimination of noise from the partial discharge measurement. Two new techniques of noise rejection on a pulse-by-pulse basis are investigated with the multiple sensors. One is founded on the correlation between pulse height in two frequency bands. The other is based on the correlation between pulse height from the two partial discharge sensors. It was found that each noise rejection technique was successful in a trial testing.
37 citations
Patent•
26 Jan 2011
TL;DR: In this article, a device for investigating the insulating properties of high-voltage oiled paper was proposed. But the authors focused on the positions of frequent faults during the operation of a converter transformer and simulated a ball board, needle board, board board, faces and suspension discharge electrode models.
Abstract: The invention relates to the technical field of high voltage and insulation, in particular to a device for researching and testing an insulating property of high-voltage oiled paper. Aiming at the positions of frequent faults during the operation of a converter transformer, the device simulates a ball-board, a needle-board, a board-board, faces and suspension discharge electrode models; and the typical high-voltage oil/oiled paper insulating experiments can be realized under direct current (DC) voltage, alternating current (AC) voltage and AC-DC voltage so as to acquire partial discharge characteristics and breakdown characteristics of the major insulation of the converter transformer.
37 citations