| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable the existing air-insulated electrical facility a dual-bus system and improve reliability and operation of the electrical facility, while the long interruption of the electrical facility is not caused and a new building site need not be secured. SOLUTION: This dual-bus composite gas-insulated switchgear has two sets of main bus-bars 41 and 42, line units 23, transformer units 34 and but-bar connection units 36. The respective units 23, 34 and 36 have disconnectors connected to main bus-bar side bushings 24, disconnectors connected to gas-insulated branch bus-bars 43, breakers 27 connected to the disconnectors and current transformers and ground switches provided on both ends of the breakers. An air-insulated main bus-bar is used as one 41 of the two sets of main bus-bars and connected to the main bus-bar side bushings of the respective units of the composite gas-insulated switchgear, and a gas-insulated main bus-bar is used as the other main bus-bar 42 and connected to the gas-insulated branch bus-bars of the respective units of the composite gas-insulated switchgear.</p> |
