| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve cut-off performance of a cut-off part and restrain decrease of dielectric strength between phases which is to be caused by evacuated high temperature gas, by displacing the position of exhaust vent parts in the axial direction. SOLUTION: Exhaust cylinders 4b, 4c in a grounded vessel 1 are so constituted that the length is increased in the axial direction as compared with the other exhaust cylinder 4a. At the time of cut-off operation, insulating gas in a puffer chamber 11 is compressed by a puffer piston 9 and a puffer cylinder 10. Gas whose pressure is accumulated by the puffer chamber 11 turns to high temperature gas, and is exhausted toward the fixed side or the movable side. The high temperature gas which flows toward the fixed side is guided and cooled by the exhaust cylinders 4a, 4b, 4c and exhausted. In the case that the length of the exhaust cylinders 4b, 4c in the axial direction is greater than the other exhaust cylinder 4a, it can be restrained that the high temperature gas which is exhausted form an exhaust vent 14a and whose flow velocity in the axial direction is decreased diffuses in the radial direction and reaches exhaust vents 14b, 14c. Thereby, local concentration of high temperature gas in the exhaust vents can be restrained, so that dielectric strength between phases can be improved.</p> |
