RISKS OF MAINTAINING HIGH VOLTAGE TRANSFORMER STATIONS
In this paper a problem of safety and security of workers during the maintenance of the high voltage transformer station is considered. Factors that dominantly influence risk to which workers are exposed during the maintenance of high voltage plants are touch voltage, step voltage, connectivity of grounding system and lightning protection. Herein a review of regulations regarding occupatinial safety and security, testing protocol, and the description of applied measurement method are given. Touch and step voltage in all possible standing points inside the high voltage plant are determined by measurement on the grounding system and by calculation. Besides, checking of the connectivity of the grounding system and lightning protection in the plant is performed. Risk analysis during the maintenance of the high voltage transformer station is performed considering the excessive step and touch voltage, lack of connectivity of the grounding system and unefficient lightning protection. Finally, a new approach for determination of probability of accidents during maintenance of TS 110/x kV is presented.