Streaming electrification in the swinging plate system

Zmarzły, D.; Frącz, Paweł

doi:10.1109/tdei.2017.006638

Cited by 5 publications

(6 citation statements)

References 18 publications

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“…The main differences between the result presented in this paper and in [26] are: the probability density distribution of the current to velocity ratio was calculated. power spectral density of the electrification signal is presented for the first time.…”

Section: Introductionmentioning

confidence: 68%

“…In the case of sinusoidal motion, it is possible to determine the frequency characteristics and therefore it is possible to study the electrification process in the frequency domain. Part of the study was published in [26] for a similar device but with rotating cylinders instead of plates [27].…”

Section: Introductionmentioning

confidence: 99%

“…The results presented in [26] focus on a different type of analysis. In particular, the paper deals with the identification of the electrification process.…”

Section: Introductionmentioning

confidence: 99%

“…Reference [26] used the "black box" model, and there was no analytical relation between input and output, but nonlinearity estimation with a piecewise linear model with 12 breakpoints.…”

mentioning

confidence: 99%

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Measurement of Dielectric Liquid Electrification in the Shuttle System with Two Parallel Electrodes

Zmarzły

Frącz

2021

Energies

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In this paper, a device with swinging plate electrodes has been proposed to measure contact electrification of a liquid sample. The proposed structure is composed of two parallel metallic plates immersed in a dielectric liquid. One of the plates is swinging with a constant frequency in a range from 0.4 to 4 Hz. The paper investigates the dependence in time and frequency of electrode velocity and streaming electrification. The measured current occurs for a very low intermittent velocity of less than 10 mm/s. In this range, the electrification current is around 50 pA. For higher velocities of up to 150 mm/s, the current is at the level of 1200 pA. The time–frequency characteristic using short-time Fourier transform shows no temporal changes in the frequency spectrum. The dependence of electrification on shuttle speed was calculated and it can be approximated with a second order polynomial model with the determination coefficient higher than 0.9. The advantage of the sensor is the ability to measure electrification phenomena without the necessity of having rotating electrodes or having a large volume of flowing liquids.

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Section: Introductionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

“…The results presented in [26] focus on a different type of analysis. In particular, the paper deals with the identification of the electrification process.…”

Section: Introductionmentioning

confidence: 99%

“…Reference [26] used the "black box" model, and there was no analytical relation between input and output, but nonlinearity estimation with a piecewise linear model with 12 breakpoints.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Measurement of Dielectric Liquid Electrification in the Shuttle System with Two Parallel Electrodes

Zmarzły

Frącz

2021

Energies

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“…Zdanowski [30] has prepared a flow system that makes it possible to test the streaming electrification depending on the type of the metering pipe material, the flow rate, and the temperature of the insulating fluid. Zmarzły and Frącz [31,32] created measuring systems with a plate and an oscillating cylinder. In these systems, the electrification current can be measured in relation to the oscillation frequency of the measuring electrode.…”

Section: Streaming Electrification Measurement Methodsmentioning

confidence: 99%

Streaming Electrification of Nycodiel 1255 Synthetic Ester and Trafo EN Mineral Oil Mixtures by Using Rotating Disc Method

Zdanowski¹

2020

Energies

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Power transformers are the main element of an electric power system. The service life of these devices depends to a large extent on the technical condition of their insulation system. Replacing mineral oils with natural or synthetic ester (retrofilling process) may increase the efficiency and operational safety of transformers, and also limit their adverse environmental impact. It is technically unfeasible to completely remove mineral oil from a transformer. Its small residues form a mixture with fluid ester, with different physicochemical and electric properties. Streaming electrification is one of the phenomena which, under unfavorable conditions, may damage the insulation system of a forced oil cooled transformer. It is necessary to run prophylactic tests for the ECT (electrostatic charging tendency) of insulating liquid mixtures from the point of view of transformer retrofilling, which is being used more often than before. The article presents the results of studies on selected physicochemical, and electrical properties, and the ECT of mixtures of fresh and aged Trafo EN mineral oil with Nycodiel 1255 synthetic ester. In this regard, the density, the kinematic viscosity, the conductivity, and the relative dielectric constant were measured. The molecular diffusion coefficient was determined using Adamczewski’s empirical dependency. The streaming electrification was tested in a rotating disc system. The impact of the rotation time, the diameter, and the disc’s rotation speed on the amount of the electrification current generated were analyzed. In addition, the co-relation between the electrification current and the composition of the mixture was determined using fresh and aged mineral oil. On the basis of the electrification model, the volume density of the qw charge was calculated, which is a parameter defining the ECT of insulating liquids. Based on the results, it was concluded that the synthetic ester is characterized by a higher susceptibility to electrification than the mineral oil. However, combining synthetic ester with a small amount (up to 20%) of fresh or aged mineral oil significantly reduces its ECT, which is beneficial from the point of view of retrofilling power transformers.

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Dynamics of impulse response of streaming electrification current in swinging cylinder system insulation

Zmarzły

Frącz

2018

IEEE Trans. Dielect. Electr. Insul.

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Streaming electrification in the swinging plate system

Cited by 5 publications

References 18 publications

Measurement of Dielectric Liquid Electrification in the Shuttle System with Two Parallel Electrodes

Measurement of Dielectric Liquid Electrification in the Shuttle System with Two Parallel Electrodes

Streaming Electrification of Nycodiel 1255 Synthetic Ester and Trafo EN Mineral Oil Mixtures by Using Rotating Disc Method

Dynamics of impulse response of streaming electrification current in swinging cylinder system insulation

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