PLANT FOR KEEPING GAS-FILLED CABLES UNDER GAGE PRESSURE Russian patent published in 1996 - IPC

FIELD: servicing of power and telephone cable lines. SUBSTANCE: plant for keeping gas-filled cables under gage pressure has compressed-air source, heat exchanger, air cleaner, drying unit, receiver, adjustable throttle, condensed moisture dump unit, and air ducts interconnecting these components. Drying unit is, essentially, disphragm-type gas separating apparatus with diaphragms, primarily in the form of hollow fibers. Condensed moisture dump unit has at least one cavity accumulating condensate and periodically acting pneumatic or electric valve. In the latter case, condensed moisture dump unit is provided with two cavities separated by diaphragm; one of cavities communicated with heat exchanger and other one, with auxiliary receiver communicating through side branch with air duct between drying unit and adjustable throttle. Drying unit may be provided with heater. EFFECT: simplified design, easy maintenance, provision for reducing oxygen content in air being dried out; provision for locating poor tightness of cable sheath by means of gas analyzer by reduction in oxygen concentration in atmosphere within leakage region. 6 cl, 1 dwg