in dealing with the issue of resistance to electromagnetic interference. Tese issues are particularly important in times of the increasing use of inverter drives, which are the source of considerable EMC interference. Te above-mentioned issues mean that even well- known companies from the energy industry do not offer products for mining and electric companies taking their first steps in the mining industry are facing considerable problems with meeting the functional and safety requirements of these devices. Modern power stations offer their users a lot of useful functionalities, such as remote operation and remote monitoring systems for control over their status. Te function of analysis of start-up currents on a given outlet is among the novelties available on the market that deserve particular attention. Tis function is especially valuable in difficult cases of protection response diagnosis during the initial run of machinery. To perform such an analysis, the station is switched to the mode of increased frequency of current registration on a given outlet. In this mode, the recording is done with the measurement period equal to 20ms. Tis allows the observation of the current waveform distortion during machine start-up, which in turn, with a little bit of experience, allows assessing the causes of power shutdowns and deciding on the further actions to be taken (e.g. engine or power cable replacement). Although the issues described here do not exhaust the subject of mine power systems, they introduce many of them, especially to those who do not normally come into contact with mining electrical engineering. Modern power supply equipment used in mines is one of the most technologically advanced pieces of equipment used in the mining extraction system. Terefore its proper operation may considerably influence the efficiency of the entire process and that is why it is so important to use high-quality equipment that allows easy diagnosis of the problems arising in connection with the supply of power to individual machines. In the era of the efforts to optimise the

process of extraction, it is extremely important the entire set of machinery and equipment was treated as a complete technological process. In addition, selecting equipment and maintaining it in good technical condition is essential for ensuring the safety and continuity of the extraction process.

Karol Bartodziej is control systems director at Famur.

LEFT: Elgór+ Hansen (Famur Group) EH-d03 type switchgear, with high frequency start-up current measurement function

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LEFT: Comparison of simplified version of power supply of home or typical industrial

machine a) and power supply of mining machine in a coal mine (b)

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