“Apparent” and true charges of partial discharges

Ovsyannikov, A. G.; Korobeynikov, S. M.

doi:10.1109/icd.2016.7547648

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…Form and size of electrode system including needle was introduced into simulation, point by point by using of electrode system photo image. [35,36] The electrode system capacitance and electric field with bubbles and no bubbles within the dielectrics is determined by calculating the distribution of potential E=-grad u. In simple case when bubble axis coincides with the axis of the electrode system, the potential distribution u can be obtained by solving a two-dimensional problem in a cylindrical coordinate system, > @`0 3with boundary conditions (4) was performed using the subsystem of the own TELMA software package [36].…”

Section: Pd In Case Of Point-plane Electrode Systemmentioning

confidence: 99%

Simulation of apparent and true charges of partial discharges

Ovsyannikov

Korobeynikov

Vagin

2017

IEEE Trans. Dielect. Electr. Insul.

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Here it is considered partial discharges in the bubbles inserted in the fluid volume in the case of electrode systems "plane-plane" and "point-plane". The calculated "true" and "apparent" charges show that the apparent charge is many times smaller than the true charge. Smaller bubble size leads to greater ratio of the true charge to the apparent charge. There are two cases when the values of these charges are close. First case: the size of the bubble is large enough, namely close to the value of the gap in the case of flat electrodes. Second case: the void is in contact with the electrode. The latter case is realized in the case of the electrode system "point-plane". The experimental and calculated data are compared for this case.

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Section: Pd In Case Of Point-plane Electrode Systemmentioning

confidence: 99%

Simulation of apparent and true charges of partial discharges

Ovsyannikov

Korobeynikov

Vagin

2017

IEEE Trans. Dielect. Electr. Insul.

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“…В настоящее время в условиях эксплуатации широко применяется диагностика состояния изоляции по параметрам частичных разрядов (ЧР). Однако теория, описывающая влияние различных режимных параметров, климатических факторов, факторов, определяющих старение изоляции на изменение параметров частичных разрядов, в полном объеме не разработана [1][2][3][4][5][6].…”

Section: Introductionunclassified

Impact of Magnetic Field on Variation of Partial Discharges Parameters in the Insulation Model with a Distributed Defect

2020

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The paper presents the experimental results of studies into the influence of an alternating magnetic field on the changes in the partial discharges parameters in the model of insulation with a distributed defect. The studies were carried out on a developed experimental setup, isolation model and based on the author's experimental technique. The research confirms the influence of the magnetic field on changes in the amplitude, number of pulses and intensity of partial discharges in practice. The analysis of the obtained data series for the reliability of differences was carried out using mathematical methods. Based on the results of the analysis of the phase-distributed patterns of the occurrence of partial discharges, the repeated appearance of additional discharges in new phase windows under the additional action of an alternating magnetic field was established.

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“…The PD pulses have been reported to have a rise time of fewer than 2 ns and the frequency contents to be in the range of hundreds of megahertz to a few gigahertz [10]. The PD signal measured at the transformer terminals is only indicative of the discharge [11] and the nature of propagation of the impinging fields through the windings is not known quantitatively. To tackle these issues and to get a better resolution and accuracy in the required frequency range, multi‐conductor transmission‐line (MTL) model has been used [4, 12–15].…”

Section: Introductionmentioning

confidence: 99%