Bus ducts are designed to perform electrical connection of the apparatus of the main circuit of a three-phase alternating current with a frequency of 50 or 60 Hz for a rated voltage of 0.4 to 35 kV with a rated current of 1600 to 33000 A and a direct current of up to 1.2 kV for a nominal current of 2000 to 6300 A at electric power stations of hydroelectric power stations, thermal power plants, state district power stations, nuclear power plants, network autotransformer substations, large thermal district boiler houses, as well as substations of all kinds.
The Bus ducts are used as high-voltage electrical apparatus of medium or high voltage in electrical connections for voltage from 6 to 35 kV inclusive, and busbars are used as low-voltage electrical apparatus for voltage from 0.4 to 1.2 kV.
The Bus ducts for the electrical connection of three-phase alternating current generators with step-up block power transformers, also with auxiliary power transformers and other electrical equipment of the main circuit of the thermal power plants, power plants, hydroelectric power plants and nuclear power plants are called generator voltage conductors.
Conduits for the electrical connection of three-phase AC power transformers of their own needs in power plants from the voltage side of 6-10 kV with cabinets of complete switchgears are called conductor circuits of their own needs.
By design, the Bus ducts are divided into phase-shielded conductors with a continuous screen and with a compensated external electromagnetic field for generators of thermal power plants, power plants, hydroelectric power plants and nuclear power plants.