Estimation of professional risk from the factor «electric field of industrial frequency»

The article presents the results of calculation of the professional risk value from the factor “electric field of industrial frequency” for the personnel of the Central (formerly the Khanty-Mansiysk) Main Power Transmission Line Company (PMES). This calculation was performed using the logical-probability model. The probability of certain events of this model were determined based on data derived from experimental studies of the electric field distribution on the open distribution 500 kV substations, of the company mentioned earlier. Special coefficients have been used to account the harmful effects for human present in areas of varying electric field. Special coefficients have been determined on the basis of the curve of maximum allowable time spent in the electric field of industrial frequency. The author points out the factors that determine the professional risk to personnel operating extra high voltage electrical equipment.