Gas insulated switchgear

A gas insulated switchgear comprising:

• a ground tank which houses a circuit breaker and is filled with insulating gas;
• a current transformer mounting cylindrical body whose one side is mounted on an opening portion formed on the upper side of said ground tank;
• a porcelain bushing whose one side is mounted on the other side of said current transformer mounting cylindrical body;
• and
• a main circuit conductor which is passed through said porcelain bushing and said current transformer mounting cylindrical body, one side of said main circuit conductor being connected to said circuit breaker and the other side thereof being connected to a main circuit terminal provided on the other side of said porcelain bushing,
• said main circuit conductor being composed of:
• a first main circuit conductor whose one side is connected to said circuit breaker and whose other side is located in one side of said porcelain bushing;
• and
• a second main circuit conductor which is connected to said first main circuit conductor and said main circuit terminal, and said gas insulated switchgear including:
• an insulator which is provided extending further downward than the lower end of said current transformer mounting cylindrical body and toward the vicinity of said circuit breaker and increasing its extended insulator outer diameter than an insulator outer diameter located in said current transformer mounting cylindrical body, and extending toward the vicinity of a connection portion between said first main circuit conductor and said second main circuit conductor and increasing its extended insulator outer diameter than the insulator outer diameter located in said current transformer mounting cylindrical body, in a region where said first main circuit conductor is located in said current transformer mounting cylindrical body;
• and
• a ground shield which is arranged in said insulator, and which is provided extending further downward than the lower end of said current transformer mounting cylindrical body and extending further upward than a coupling portion between said current transformer mounting cylindrical body and said porcelain bushing.