D. Grecea, F. Paun, S. Burian, M. Darie, C. Colda
Thursday 11 October 2018 by Libadmin2018


The use of electricity in potentially explosive atmospheres has many features for which the issues concerning the design of electrical equipment and installations raise many difficulties. One of the significant difficulties is the implementation of conditions fort ensuring explosion protection even under the conditions of failure scenarios.
For low current electrical equipment (interlocking, command, data communications, signalling) the assessment of explosion protection is often carried out by calculation using the technical data available in the specific standard related to protection to explosion requirements.
Currently the method of calculation uses simplified but covering models. The major advantage of the outcome’s certainty on the confirmation of the explosion protection is balanced by the increased rate of rejection. Complex equipment which cannot be assessed by calculation is tested in explosive atmospheres in compliance with the requirements set out in the relevant standard.
The first part of the paper presents the analysis and characterization of linear sources use in intrinsic safety circuits.
The second part of the paper presents the computer application developed in MATLAB/Simulink platform, which will facilitate the assessment of low current circuits according to the possible failure scenarios.
In order to conclude, there are mentioned the efficiency of the simulation model and its’ current limitations.

Keywords: explosive atmosphere, explosion protection; electrical equipment

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