Gas insulated switchgear with flange-spacer assembly
AssigneeHitachi, Ltd.
InventorsKeiichi Tsuzura, Kazuhiko Takahashi, Junzo Kida, Minoru Yabuki
Life of this patent
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Abstract
A gas insulated switchgear includes a bus unit, a breaker unit and a line side unit. An insulating spacer structure attaching at least two of the units together includes an inner flange on a first unit, an outer flange on a second unit, and an insulating spacer positioned between the first and second units. Closed end tapped holes are formed in the inner flange and idle holes are formed in the outer flange, and tapped holes with a larger diameter than that of the tapped holes of the inner flange are formed in the insulating spacer.
Claims6
In a gas insulated switchgear having a bus unit, a breaker unit and a line side unit, the improvement which comprises an insulating spacer structure attaching at least two of said units together, said insulating structure including;
- an inner flange on a first unit;
- an outer flange on a second unit;
- and
- an insulating spacer positioned between said first and second units;
- and wherein
- closed end tapped holes are formed in said inner flange and idle holes are formed in said outer flange, and holes with a larger diameter than that of said tapped holes of said inner flange are formed in said insulating spacer.
In a gas insulated switchgear having a bus unit, a breaker unit and a line side unit, the improvement which comprises an insulating spacer structure attaching at least two of said units together, said insulating structure including;
- an inner flange on a first unit;
- an outer flange on a second unit;
- and
- an insulating spacer positioned between said first and second units;
- wherein
- closed end tapped holes are formed in said inner flange and idle holes are formed in said outer flange, and tapped holes with a larger diameter than that of said tapped holes of said inner flange are formed in said insulating spacer;
- and wherein
- when separating said inner flange in a state that said insulating spacer is attached to said outer flange, bolts are screwed into said tapped holes made in said insulating spacer so as to connect said outer flange to said insulating spacer and when separating said outer flange in a state that said insulating spacer is attached to said inner flange, bolts are screwed into said tapped holes made in said inner flange so as to connect said inner flange to said insulating spacer.
In a gas insulated switchgear having a bus unit, a breaker unit and a line side unit, the improvement which comprises an insulating spacer structure attaching at least two of said units together, said insulating structure including
- an inner flange on a first unit;
- an outer flange on a second unit;
- and
- an insulating spacer positioned between said first and second units;
- wherein
- closed end tapped holes are formed in said inner flange and idle holes are formed in said outer flange, and holes with a larger diameter than that of said tapped holes of said inner flange are formed in said insulating spacer;
- and wherein
- a plurality of first holes with a diameter of D1 are formed in the periphery of said outer flange, and a plurality of second holes with a diameter of D2 are formed in the periphery of said insulating spacer, and a plurality of third holes with a diameter of D3 are formed in the periphery of said inner flange, and the relationship between said diameters of said holes is set to D1≧D2≧D3.
Dependencies are inferred from the claim text.