07/2021 - cover

Bezpieczeństwo Pracy i Ochrona Środowiska w Górnictwie Number 07/2021

SMA'S MONTHLY MAGAZINE

Magdalena ADAMCZYK-FRYSTACKA, Roman FRYSTACKI, Erita FILIPEK

Since 2020, when the first cases of SARS-CoV-2 were recorded in Europe, it was known that the virus would spread the fastest in large population centers. This is what mining plants are like, where there are large concentrations of workers in a small area. This work presents how the chosen mining plants in Silesia coped with the increasing incidence of COVID-19 among their employees and what improvements they introduced to prevent the spread of the virus.

Andrzej MIKULSKI

The first Polish mining law was enacted ninety years ago and has become the foundation of uniform regulations for mines located in previous partitions territory of Poland. The act of mining enacted in 1930 gave the central mining authorities the jurisdiction to establish detailed regulation based on this legal act. As a result, in 1947 the President of the State Mining Authority in Katowice enacted The transport of persons mine shaft regulation” (in Polish) which for the first time contained requirements related to transporting persons. Despite passing of the time, most of them are still valid. Current regulations consist of four parts: technical requirements for designing and producing elements of the mining shaft hoists, safety regulations for using hoist machines, control and supervision the working staff. The article writes about them on the background of the regulations changes within the last ninety years.

Arkadiusz ADAMEK

The article analyzes the effects of connecting methane generators to the in-house 6kV medium voltage mine grid. Issues which should be analyzed before the commencement of each investment process at a given production plant have been highlighted. These include, in particular: withstand current of the switching instruments installed so far with 6 kV cable lines, voltage analysis along with analysis of voltage changes and earth current distribution in the galvanically connected medium voltage network. It should be noted that the connection of new methane generators connected to the 6 kV in-house mine power network results in an increase of characteristic fault currents, and thus results in the potential need to replace a part of the switching instruments used in it. The technical analysis was performed using a program supporting calculations in the 6 kV medium voltage mine network with an isolated neutral point of the transformer. The calculation was performed using the method described in the standard [2]. The absence of adequate analysis may cause catastrophic effects, dangerous in terms of safety of operation of electrical equipment in the network, and in costly technological downtimes in a given mining plant.

Evolution of regulations concerning the examination of causes and circumstances of accidents and other events occurring in mining plants (part IV)
Przemysław GRZESIOK

Post-mining heaps, i.e. the most beautiful Polish mountains
Anna SWINIARSKA-TADLA

Four-legged and winged friends working in the mine
Michał WROŃSKI

do góry