Switchgear driving device

A switchgear driving device that effects turning-on/off of contacts including a stationary electrode and a movable electrode by using a hydraulic oil,

• the switchgear driving device comprising:
• a rod coupled to the movable electrode;
• an operation piston connected to the rod;
• a fluid pressure mechanism part including an operation cylinder in which the operation piston slides, a turning-on pressure accumulation chamber and a turning-off pressure accumulation chamber effecting pressure accumulation on the hydraulic oil for turning-on/off, and a main control valve controlling the pressure of the hydraulic oil in the operation cylinder;
• a turning-on pressure accumulation piston sliding inside the turning-on pressure accumulation chamber;
• a turning-on pressure accumulation spring that imparts a driving force to the turning-on pressure accumulation piston to pressurize the hydraulic oil within the turning-on pressure accumulation chamber;
• a turning-off pressure accumulation piston sliding inside the turning-off pressure accumulation chamber;
• a turning-off pressure accumulation spring that imparts a driving force to the turning-off pressure accumulation piston to pressurize the hydraulic oil in the turning-off pressure accumulation chamber;
• and a spring case accommodating the turning-on pressure accumulation spring and the turning-off pressure accumulation spring,
• wherein the turning-off pressure accumulation spring is arranged inside the turning-on pressure accumulation spring.