Human body electrification in vicinity of charged container - medium charge density limits

Kacprzyk, R.; Pelesz, Adam

doi:10.1016/j.elstat.2021.103658

Cited by 2 publications

(2 citation statements)

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“…An insulated metal sheet exposed to a spark stream was capable of collecting an electrostatic charge, which was subsequently collected on a condenser by means of a controlled electrostatic discharge, and the electric voltage on the condenser was then measured. Under no circumstances did the determined electrostatic charge exceed a value of 10nC, which constitutes a safe value that is incapable of initiating methane explosion [21], as per applicable laws. 4.…”

Section: Discussionmentioning

confidence: 99%

“…The measuring circuit was similar to the circuit described. It was assumed that the mechanical friction-induced [21] sparks would be projected onto a metal sheet insulated from the ground and connected to an electrostatic voltmeter with high input impedance. An input impedance greater than 100 TΩ ensures that any losses on account of the electrostatic voltmeter are minor and it also enables the measurement of such small and short surges in the first place.…”

Section: Electrification Ability Testmentioning

confidence: 99%

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Mechanical Spark Electrostatic Property Testing Method

Kędzierski¹

2023

Management Systems in Production Engineering

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The article describes an attempt to assess the electrostatic properties of mechanical friction-induced sparking. Such sparks are the cause of numerous accidents in hard coal mines. The article summarizes accidents in hard coal mining in Poland in recent years. In most cases, the initials were mechanical sparks. Mechanical sparks contain energy, a part of which is related to their excess electrostatic charge, whereas the other part is of a different origin (kinetic or thermal energy, for example). The article tries to estimate how much of this energy is energy impact generated by electrostatics impact. It is hard to measure the dynamic electrostatic parameters like electric charge. Authors select four measuring methods. This test methods are prepared based on authors knowledge of electrostatic parameters and European standards dedicated to measure the electrostatics parameters. These circuits were prepared for four different spark parameters. Measurement methods of electrostatic field of sparks stream are not able to measure field potential of sparks. The measuring instruments do not have such a fast response time, adequate to the speed of the sparks. Spark generation and parameter measurement experiments were performed. The only method to determine the amount of electrostatic charge on sparks is to measure the entire charge by collecting sparks at the measuring electrode. The measuring system requires that the entire stream of sparks falls on the electrode. Tested transferred electrostatic charge of stream of sparks is about 10 nC. It means that this charge can be an effective ignition source for some explosive atmospheres. Electrostatic charge with Certain methods were rejected as inadequate following result analysis. A claim for one of the methods was submitted to the Patent Office of the Republic of Poland.

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Section: Discussionmentioning

confidence: 99%

Section: Electrification Ability Testmentioning

confidence: 99%