Gas circulating system for compressed gas operated circuit breakers

Claim 1

IN A PRESSURE GAS OPERATED ELECTRICAL POWER SWITCH HAVING A CLOSED GAS CIRCULATING SYSTEM, THE COMBINATION COMPRISING A LOW-PRESSURE TANK, A HIGH-PRESSURE ACCUMULATOR, SAID TANK AND ACCUMULATOR BEING INTERNALLY COMMUNICABLE WITH EACH OTHER THROUGH THE QUENCHING CHAMBER OF THE LOAD BREAKING SWITCH CONTACTS ONLY UPON DISCONNECTION OF SAID CONTACTS, THEREBY TO ESTABLISH A FLOW OF GAS FROM SAID ACCUMULATOR TO SAID LOW-PRESSURE TANK, A GAS LINE EXTENDING BETWEEN SAID LOW-PRESSURE TANK AND HIGH-PRESSURE ACCUMULATOR, SAID GAS LINE INCLUDING A CONTROL VALVE, AND A COMPRESSOR FOR RETURNING GAS FROM SAID LOW-PRESSURE TANK INTO SAID HIGH-PRESSURE ACCUMULATOR AND RAISING THE PRESSURE THEREOF, A PRESSURE DIFFERENCE CONTROLLER RESPONSIVE TO THE DIFFERENCE IN PRESSURES OF THE GAS IN SAID LOW-PRESSURE TANK AND SAID HIGH-PRESSURE ACCUMULATOR FOR CONTROLLING THE OPERATION OF SAID CONTROL VALVE AND SAID COMPRESSOR, A SECOND CONTROLLER RESPONSIVE TO THE PRESSURE IN SAID LOWPRESSURE TANK, A GAS SUPPLY TANK, A GAS SUPPLY LINE FROM SAID GAS SUPPLY TANK INTO SAID LOW-PRESSURE TANK AND WHICH INCLUDES A FEED-IN VALVE, A GAS DISCHARGE LINE TO SAID GAS SUPPLY TANK FROM SAID LOW-PRESSURE TANK AND WHICH INCLUDES A DISCHARGE VALVE, AND MEANS CONTROLLED BY SAID SECOND CONTROLLER FOR OPERATING SAID FEED-IN AND DISCHARGE VALVES IN ACCORDANCE WITH THE CHANGE IN GAS PRESSURE IN SAID LOW-PRESSURE TANK, THEREBY TO MAINTAIN A CONSTANT GAS VOLUME IN SAID CLOSED GAS CIRCULATING SYSTEM.