Визначення умов роботоздатності ізоляції розподільних мереж напругою 6-35 кВ

Abstract

It is proved that as an integral diagnostic parameter of the technical state of distribution networks (DN) insulation it is advisable to use the dynamic characteristic of the active insulation resistance of the entire network. It is shown that the change in the technical state of isolation of individual elements of the DN is due to the formation of shunt connections between the current-carrying part and the ground. Under the influence of the environment and overvoltage, the active resistance of the shunt connections changes. Existing control methods do not allow the dynamic characterization of the active insulation resistance of the network to be reflected. It is not normalized and its size, so there is a need to build and analyze a diagnostic model to determine the working conditions of isolation. The principle of determining the operability of DN insulation with respect to the earth is proposed, which is based on the application of the criteria of electrical safety and the minimum of losses of electricity in isolation from currents of runoff to the ground.