The distribution system for power plants, petroleum, chemical, metallurgy, textile, building and other industries. In large power plants, petroleum system, high degree of automation, requirements and computer interface, as a three-phase AC frequency is 50 (60) Hz, rated working voltage is 380V (400), (660), rated current is 4000A below the hair, power supply systems in power distribution, motor centralized control, without the use of reactive power compensation of low-voltage power distribution device.