Hydraulic drive for a switchgear
US10229799B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 2016 |
| Grant date | Mar 12, 2019 |
| Priority date | — |
| Expiry date | Feb 10, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H33/302
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switchgear driving device has a rod coupled to a movable electrode; an operation piston connected to the rod; and an operation cylinder in which an operation piston slides. A main control valve controls the pressure of the hydraulic oil in the operation cylinder. A turning-on pressure accumulation piston slides inside a turning-on pressure accumulation chamber; and a turning-on pressure accumulation spring 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 slides inside a turning-off pressure accumulation chamber. A turning-off pressure accumulation spring imparts a driving force to the turning-off pressure accumulation piston to pressurize the hydraulic oil in the turning-off pressure accumulation chamber. A spring case accommodates 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.