Evaluation of Explosion Protection Means of Mine Electrical Equipment forOperation in Excavations of Coal Mines

Sensing for equipment location and mapping in explosion risk zones such as underground coal mines is a difficult proposition due to the regulatory requirement for certified protective enclosures to safely house the required complex electrical equipment. This paper provides a case study for the process involved in creating and implementing an optical-grade enclosure for use in these environments. The result of this process has been the creation of ExScan®, a 3D laser mapping system that is providing step-change capability for remote operations and automation in the underground coal mining industry.

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Safety barrier of electrical equipment for environments with a potential explosion in underground coal mines

Mining of Mineral Deposits ◽

10.33271/mining14.03.078 ◽

2020 ◽

Vol 14 (3) ◽

pp. 78-86

Author(s):

Titu Niculescu ◽

Victor Arad ◽

Marius Marcu ◽

Susana Arad ◽

Florin Gabriel Popescu

Keyword(s):

Coal Mines ◽

Electrical Equipment ◽

Safety Barrier ◽

Underground Coal Mines

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Technology of Building Locally Detailed Differential Grids for the Calculation of Affected Areas at Gas and Dust Explosions in Coal Mines

Vestnik NSU Series Information Technologies ◽

10.25205/1818-7900-2020-18-1-50-64 ◽

2020 ◽

Vol 18 (1) ◽

pp. 50-64

Author(s):

O. Yu. Lukashov ◽

D. A. Kostromin

Keyword(s):

Coal Dust ◽

Coal Mines ◽

Three Dimensional ◽

Three Dimensions ◽

Industrial Safety ◽

Computational Domain ◽

Gas Dynamic ◽

Explosion Protection ◽

Mine Workings ◽

The Difference

The article describes the technology of discretization of the computational domain for solving unsteady gas-dynamic problems in the field of industrial safety of coal mines. The most important of this problem is the calculation of the parameters of air shock waves and the affected areas during methane explosions in mine workings. The technology allows you to automate the construction of a differential grid for a spatial network of mine workings, taking into account the features of the mines topology and simulated processes. At the same time, the grid can consist of cells of various dimensions – one-dimensional, two-dimensional and three-dimensional. The aim of the work is to create the basics for the development of scientific research of gas-dynamic processes in gas explosions in mining workings by taking into account new factors – means of explosion protection, the participation of coal dust, etc. The tasks of the work include: developing an addressing system for identification and quick access to arbitrary cells of the difference grid; the construction of unambiguous spatial relationships between the corresponding faces of the cells during their splitting and combining; testing of the technology on the mine network of a real mine. A new approach in the work is the possibility of automating the partition of the computational domain with the simultaneous use of cells of all three dimensions. The article contains details of the implementation of technology. The article shows the results of splitting the network of mine workings in a real coal mine, the results of calculations using the obtained grid and the convergence of the results to a solution when reducing the step as a result of subsampling the computational domain with different depth of splitting.

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Considerations regarding the new requirements for the evaluation of rotating electric machines with increased safety protection type “e”

MATEC Web of Conferences ◽

10.1051/matecconf/202134204003 ◽

2021 ◽

Vol 342 ◽

pp. 04003

Author(s):

Marcel Daniel Rad ◽

Diana Sălăsan ◽

Sorin Zsido

Keyword(s):

Electrical Equipment ◽

Electric Machines ◽

Security Requirements ◽

European Level ◽

Safety Protection ◽

Explosion Protection

The evaluation of explosion-proof electrical equipment for certification is particularly important given the risk of explosion and must be minimized. This in order to ensure the safety of life, health of workers, to prevent damage to goods and the environment when they meet the essential security requirements at European level. Directive 2014/34 / EU states that equipment used in explosive atmospheres must be designed to operate without endangering the environment for which it is intende. This paper proposes the study and evaluation of the requirements for the evaluation of rotating electric machines with increased safety protection type “e”. The rotating electric machines with increased safety protection type “e”, in order to comply with the explosion protection, it must meet certain requirements given by the standard SR-EN 60079-7.

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Considerations regarding the choice of cable glands for electrical equipment used in potentially explosive atmospheres

MATEC Web of Conferences ◽

10.1051/matecconf/202235400049 ◽

2022 ◽

Vol 354 ◽

pp. 00049

Author(s):

Marcel Daniel Rad ◽

Dragos Fotau ◽

Diana Sălăsan ◽

Sorin Zsido

Keyword(s):

Electrical Equipment ◽

Security Requirements ◽

European Level ◽

Practical Guide ◽

The World ◽

Different Types ◽

Explosion Protection ◽

Electrical Apparatus

The evaluation of explosion-proof electrical equipment for certification is particularly important given the risk of explosion and must be minimized. This in order to ensure the safety of life, health of workers, to prevent damage to goods and the environment when they meet the essential security requirements at European level. Directive 2014/34 / EU states that equipment used in explosive atmospheres must be designed to operate without endangering the environment for which it is intended. This paper presents a comparison between the different types of cable glands for electrical apparatus by comparing some common characteristics that are important for maintaining the integrity of explosion protection. Consequently, this paper intends to be the precursor of a practical guide for the selection and implementation of different types of protection on the apparatus intended for use in areas with hazard of explosive atmospheres, both for designers and manufactures. This state of fact is negatively more emphatic because, lately, the groups of standards from this field in the world, Europe and Romania have a peculiar dynamic caused especially by the homogenisation and generalisation process opened and maintained by IEC.

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Considerations regarding test methods against dust and water ingress protection for Ex equipment

MATEC Web of Conferences ◽

10.1051/matecconf/202235400048 ◽

2022 ◽

Vol 354 ◽

pp. 00048

Author(s):

Niculina Vătavu ◽

Mihaela Părăian ◽

Sorin Vătavu ◽

Mihai Popa

Keyword(s):

Health And Safety ◽

Essential Element ◽

Electrical Equipment ◽

Test Methods ◽

Water Ingress ◽

Degree Of Protection ◽

Normal Degree ◽

Explosion Protection ◽

European Standards ◽

Explosion Risk

The explosion danger in all industries where explosive atmospheres generated by the mixture of combustible dusts or flammable gases with air may form, must be treated as a major hazard, as the explosions that may occur can seriously affect both health and safety people, as well as the environment. It is therefore necessary to assess the explosion risk and to establish appropriate measures to reduce it to acceptable levels in accordance with the requirements of the European Directives. An essential element in the assessment of the explosion risk for electrical and non-electrical equipment intended for use in potentially explosive atmospheres is the way in which an appropriate normal degree of protection is provided through the equipment housing (protection against touching of dangerous parts inside the equipment housing and protection against the ingress of dust and water inside it). The aim of the paper is to highlight compliance with the requirements of the ATEX Directive, given that this protection is a basic requirement for explosion protection and to present the important elements to be considered for the assessment of the normal degree of protection and the development of harmonized test methods with the requirements of European standards.

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