The article attempts to Express an opinion on the recent discussion about the meaning of the explanation obtained during the pre-investigation check. The authors Express an opinion on whether the explanation is evidence that combines elements of objective and subjective in its evaluation, and whether it can be used at the stage of preliminary investigation and trial on the merits.

The features of the application of the balancing transformers with artificial switching as regulated power sources of the process plants are considered. The proposed approach makes it possible to convert AC to DC to supply the load and simultaneously generate reactive power of a capacitive nature, which is aimed at meeting the current Russian and foreign standards for electromagnetic compatibility of the consumer with the supply network. The characteristics obtained as a result of computer simulation in the MATLAB Simulink environment and its SimPowerSystems application confirmed the main positive features of compensation converters. It is shown that the main advantage of controlled compensation converters is the possibility of creating a frequency-controlled asynchronous electric drive with separate frequency and voltage control, which will significantly improve the energy characteristics of an asynchronous motor by reducing losses, increasing the service life of insulation, and significantly improving electromagnetic compatibility.

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Analysis were carried out of power rectifiers’ commutation in balancing transformers at lead control angles, positive effect of shielding angle against surge voltage on the equipment main performance indicators was established, equations and experimental characteristics of this component operation were provided. As a result of theoretical and experimental investigations of the surge protection device operation, a significant positive effect on the quality of switching power rectifiers in the balancing transformer in case of lead control angles was detected. The relationship between the degree of reduction of overvoltage in the input phase voltage of the converter and the capacitance values of the capacitor, the angle of the first switching stage and the lead control angle of the converter were determined. A further study of the unit operation is to establish practically applicable quantitative relations between the specified values.