Features of cubicle type vacuum-insulated switchgear (C-VIS)

A 24kV cubicle type vacuum-insulated switchgear (CVIS) has been developed to satisfy a wide variety of requirements for electric power supply systems. The CVIS has achieved a SF6-gas-free system by mixed insulation technology with vacuum, solid and air for both environmental friendliness and ease of maintenance. The vacuum switches for circuit breaker, disconnector and earthing switch are integrated as one switch unit in order to reduce the size and the weight of the equipment. The switch unit is insulated with molded epoxy resin against the earth fault. No high-voltage part is exposed in the CVIS for safety improvement. Moreover, the molded epoxy resin ensures the long-term reliability of the switches. Each phase is separated completely to prevent interphase short circuit. The double-break three-position vacuum switch improves the reliability of the current breaking performance. The electro-magnetic driving mechanism with greaseless linkages makes periodical lubrication unnecessary and saves the driving energy.