Promising ways to improve safety non-stationary electric machines

Introduction. The widespread use of non-stationary electric machines (SPM) in the rural infrastructure, which are operated in specific conditions, is associated with the impact of hazardous factors on humans, such as electric current and vibration. Therefore, the solution to the problem of SPM safety should be comprehensive in order to reduce the occurrence of electrical injuries and vibration injuries when working with this electrical equipment.
Object. The object of the study is the SPM used at the enterprises "Agroholding Nikolaevsky" and "SIBAGRO" of the Republic of Buryatia of the Baikal region.
Materials and methods. The article analyzes the safety of SPM by two methods in two areas of research: electrical safety and vibration safety. At this stage, when operating the SPM, it is advisable to use residual current devices (RCDs) to ensure electrical safety, which provide protection of a person from electric shock in the event of emergencies. To ensure vibration safety of SPM, in particular, hand-held power tools, it is advisable to use advanced vibration protection. Existing means of vibration protection do not fully ensure the vibration safety of handheld power tools and can cause vibration damage to a person working with this equipment.
Results and discussion. As a result of the studies performed, portable three-phase RCDs with smooth and step-by-step regulation of the tripping current setpoint from 5 to 30 mA with a response time of 0.03 s were developed to improve the electrical safety of SPMs. These RCDs protect single SPMs and can protect stationary electrical installations in group networks at a rated voltage of 220/380V and a load current of no more than 16A. Showing a reduction in the occurrence of electrical injuries by up to 70%. In order to improve the vibration safety of the SPM, additional vibration protection devices have been developed, which represent the design of a shock-absorbing device in a hand-held power tool. When substantiating the elements of the shockabsorbing device, the parameters of the hand-held power tool were studied without additional vibration protection. Experimental operation of hand-held power tools with additional vibration protection showed a significant reduction in vibration parameters by 20÷30% and compliance of vibration speed values with regulatory requirements. The above approach to solving the problem contributes to a significant increase in the safety of SPM and their subsequent operation at agricultural facilities.

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