Gas circuit breaker and liquid pressure-driving system to be used therefor
US5804787A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1996 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Nov 13, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H33/34
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
For the purpose of providing a gas circuit breaker with a structure of hydraulic pressure operation system capable of detecting the occurrence of an incomplete closed state of the valves therein to prevent their erroneous motion during the subsequent motion, and a liquid-pressure driving system to be used therefor, a check valve is arranged so as to suppress the flow into the space on the side of the downstream of a closed-circuit operation spool valve, wherein the space on the side of the downstream of the closed-circuit operation spool valve is connected through a second diaphragm to a low-pressure oil tank and the operation time or operation number of a liquid-pressure pump is measured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.