Zagaynova O. Improving the efficiency of operation of high-voltage bushings by reducing technical risks. Manuscript.

The methods and criteria used to assess the technical condition of high - voltage bushings (HVB) during periodic examinations are analyzed. A brief description of modern information and measuring systems and monitoring systems used to assess the technical condition of electrical equipment. It is established that to determine the maximum allowable values of insulation of HVB, it is most appropriate to use the criteria of minimum average risk. It is established that the values of indicators in serviceable inputs, in addition to the rated voltage, input design, type of insulation and type of oil, which is known and reflected in current regulations, have a significant impact on input load currents and consumer composition. It is found that the values of isolation indices in both serviceable and defective inputs can be described by the Weibull distribution. According to the results of the analysis of the closeness of the correlations between the insulation indicators of the inputs, the possibility of using one-dimensional distributions of the insulation indicators of HVB to determine the maximum allowable values by the minimum risk method is substantiated. A method for determining the maximum allowable values of insulation of HVB, which differs from the existing ones in that the maximum allowable values of indicators are determined by minimizing the function of medium risk taking into account the distribution of values for good and defective conditions, as well as operation, which provides the minimum possible damage in case of wrong decisions. It is proved that the maximum allowable values of insulation indicators cannot be constant, but must be adjusted taking into account the input currents, the composition of consumers, service life and other factors.It is established that the development of defects in HVB can lead not only to changes in the values of insulation, which is known and widely used, but also to change the nature of the dependences of the indicators on the duration of operation. In particular, the appearance of a statistically significant systematic component in the dependence of indicators on the duration of operation is evidence of a defect, even if the values of indicators do not exceed the maximum allowable value, which allows to detect input faults at an early stage of their development. A method for early prediction of HVB faults is proposed, which consists in determining the pairwise correlation coefficients between the indicators and the service life, between the indicators in the analyzed input and the indicators of the inputs of adjacent phases. The method of continuous control of internal insulation of capacitor type in oil-filled high voltage power equipment is improved, which differs from the existing ones in that for control of insulation condition of HVB the estimation of not only leakage current values , which allows you to detect defects at an early stage. An algorithm for the method of controlling the dielectric characteristics of the internal insulation of the capacitor type under operating voltage has been developed and programmatically implemented. A prototype of a device for continuous control of electrical parameters of the internal insulation of the capacitor type in oil-filled high-voltage equipment as an element of ACS TP substation for implementation on the substation "Artema-330 kV" Northern power system NEC "Ukrenergo" for control under operating voltage power autotransformer. The improved method of continuous control is protected by 2 utility model patents.