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US 4,730,092 AGranted
Hydraulic driving device for an electric pressurized-gas switch
AssigneeSiemens Aktiengesellschaft
InventorsHorst Eggert, Wolfgang Jacobsen
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AssigneeSiemens Aktiengesellschaft
InventorsHorst Eggert, Wolfgang Jacobsen
Estimating the term…
In a hydraulic driving device for an electric pressurized-gas switch, the piston-cylinder systems are responsive to pressure from a hydropneumatic pressure accumulator. The driving device is equipped with a hydraulic pump which feeds several pressure accumulators and is controlled by pressure monitors, and with a gas monitoring device for the pressure monitors. For solving the problem of carrying out indirect gas monitoring while feeding several pressure accumulators by one hydraulic pump instead of direct gas monitoring, there is provided at least one threshold switch for measuring the feed pressure of the hydraulic pump as part of the gas monitoring device. By feeding the pressure accumulators which takes place sequentially in time and is controlled on the one hand by the gas monitoring device and by the pressure monitors on the other hand, it is possible to establish a correlation specific as to the pressure accumulator of the gas loss signal delivered by the threshold switch.
An hydraulic driving device for an electric pressurized-gas switch having a piston-cylinder system comprising a plurality of piston-cylinders for operating respective switch contacts, each piston-cylinder being respective to a respective hydropneumatic pressure accumulator supplied by an hydraulic pump which feeds a plurality of said pressure accumulators, a respective pressure monitor being associated with each accumulator which monitors the pressure in a feedline to the respective accumulator, and further comprising a gas monitoring device for the pressure accumulators, said gas monitoring device comprising a threshold switch for measuring an output pressure of the hydraulic pump, said hydraulic pump being responsive to each of said pressure monitors on an individual basis to supply hydraulic fluid to a selected one of said accumlators associated with a particular one of said pressure monitors indicating a low pressure in the feedline supplying the respective accumulator, said hydraulic pump also being responsive to said threshold switch in the event the fluid pressure to a respective accumulator increases beyond a predetermined threshold if the gas pressure in an accumulator falls below a predetermined limit value.
Dependencies are inferred from the claim text.