| 摘要 |
The circuit breaker is housed in a porcelain container (1) and filled with dielectric gas. The static arc contact (3A) contacts an arc contact (7A) on a moving tube. An arc suppression protrusion (10) is fixed to the top of the tube and forms a first extinction chamber (17) with the contact plate (9). A one-way valve (9A) in the contact plate wall leads to a second extinction chamber (18). A piston (12) slides in the chamber, forming the back wall (11) of the chamber and has a valve (11A). There is a restraining spring (15) at the back of the piston. During the first opening period, the piston remains fixed in position by the spring, removing gas from the second extinction chamber. Once the piston reaches the first end wall, it moves back with the contact breaker, forming a two stage mechanism. |
