Method for reducing the air supply from the atmosphere into the expansion tank of high voltage facilities filled with isolating fluid and device for carrying out the method

摘要

The method involves determining buffer space volume by lower and upper working temperatures (Tu, To) of an insulating fluid in a high-voltage system i.e. transformer. Gas is delivered from an external buffer space (15) by oil expulsion via a pipe opening (4), where the pipe opening is provided in a casing of inner small tank (3), during exceeding of pre-defined high pressure relative to atmospheric pressure. Air is supplied from the atmosphere into the buffer space via a compensation pipe (8) and by oil expulsion via the pipe opening, when low-pressure falls below the atmospheric pressure. An independent claim is also included for a device for reducing an oxygen content of air in an expansion tank of a high voltage system.