Busbars for the Switchgears and Internal Connections of the Power Plants and 6- to 750-kV Substations

Abstract

The use of rigid noncorona busbars with the air insulation, gas-filled current leads, and current leads with the polymeric insulation to connect various high-voltage elements at plants and substations allows providing a decrease in the electric energy losses, increase in reliability and safety of operation, as well as improving the ecological situation at the plants and substations. Compactness of the busbars is provided due to the use of new insulation media (first and foremost, electrically high-strength gases and polymeric dielectrics), as well as improvement of the technology of production and use of these materials. At present, various types of high-voltage current leads are used: shielded air busbars, busbars with the cast polymeric insulation, and sealed shielded current leads with the basic high-strength gas insulation. Engineering solutions in which insulation media with low dielectric permeability are used and the buses are made noncorona with rated operating voltage are applied to reduce the losses in the busbars.