Hladkov O.Yu., Mnukhin A.H., Stasevych R.K. Estimate of intrinsic safety of capacitive circuits

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Parent Category: Geo-Technical Mechanics, 2019

Category: Geo-Technical Mechanics, 2019, Issue 148

Geoteh. meh. 2019, 148, 38-48

https://doi.org/10.1051/e3sconf/201910900027

ESTIMATE OF INTRINSIC SAFETY OF CAPACITIVE CIRCUITS

¹Hladkov O.Yu., ²Mnukhin A.H., ³Stasevych R.K.

¹Subsidiary enterprise «Production and engineering firm «SHATL»,²Zaporizhzhia State engineering academy, ³Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine

UDC [621.3.011.732.14:62-768.3].001.24

Language: English

Abstract.

The purpose of this research work is the development and the testing of universal method for computer estimate of intrinsic safety of inductive capacitive circuits, which takes into account the most hazardous discharge type by contact closure and the obtainment of regression dependences of minimal igniting energy on discharge time in a capacitive circuit and the comparison of results with available experimental dependences.

The special aspects of suggested method for evaluation of intrinsic safety of capacitive circuits come down to development of a universal computer model of contact closure discharge and obtainment of regression dependences of minimal igniting energy on discharge time in a capacitive circuit. The development of a universal computer model of contact closure discharge was carried out with the help of empirical and theoretical studies.

The developed computer model of a short circuit discharge makes it possible to determine the estimated dependence of energy and time of existing of a short circuit discharge in inductance-capacitance circuit for evaluation of intrinsic safety of complex circuits which parameters are missing in regulatory documents.

The reproducibility of modeling in response to experimental data does not exceed 95 %, which characterizes this model as a relative precise one.The obtainment of regression dependences of allowable igniting energy on discharge time in capacitive circuit was made by means of methods of empiric and experimental studies.

Analytical dependences of the most suitable regression equations and their approximation coefficients are found. The approximation accuracy was 0.99. The regression equation is obtained, which relates the minimum ignition energy and discharge time, as well as the voltage of the circuit capacitance.

Estimation of intrinsic safety of capacitive circuits comes down to calculation of values of released discharge energy and its duration  by means of modeling of the circuit being estimated with the help of computer model taking into account reserve coefficient, determination of minimum igniting energy depending on circuit voltage.

As follows from the analysis, the discordance between data obtained and GOST data does not exceed 15 %. The use of method for assessment of electric circuits of intrinsic safe equipment being developed for gaseous mines reduces significantly the time of its implementation with more exact following the parameters of intrinsic safety and leads therefore to risk reduction of an explosion and freely burning fire occurrence.

Keywords: coal industry, calculation methods, intrinsic safety assessment, discharge energy, reliability of results.

References

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8.  DP “UkrNDNTS”, (2016), DSTUEN 60079-11:2016. Vybukhonebezpechnihazoviseredovyshcha. Chastyna 11. Zakhystelektrychnohoobladnannyazadopomohoyuiskrobezpechnohoelektrychnohokola «i», [DSTU EN 60079-11:2016. Explosive gas environments. Part 11. Protection of Electrical Equipment with the Intrinsically Safe Circuit "i"] DP “UkrNDNTS”, Kyiv, Ukraine.

About the authors

Gladkov Oleksandr Yuriiovych, Subsidiary enterprise «Production and engineering firm «SHATL», Kryvyi Rih, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Mnukhin Anatolii Hryhorovych, Doctor of Technical Sciences, Professor, Head of the research laboratory of the Zaporizhzhia State Engineering Academy, Zaporizhzhia, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Stasevych Ryshard Kazymyrovych, Doctor of Technical Sciences, Senior Researcher of Department of Underground Coal Mining Technology, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

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