| 20110114364 | METHOD FOR REDUCING THE AIR FEED FROM THE ATMOSPHERE INTO THE EXPANSION VESSEL OF HIGH-VOLTAGE SYSTEMS FILLED WITH INSULATING LIQUID AND DEVICE FOR CARRYING OUT THE METHOD - The invention relates to a method for reducing the air feed from the atmosphere into the expansion vessel of high-voltage systems filled with insulating fluid and also relates to a device for carrying out the method, the design of the device differing for new transformer installations form that of transformers with thermal aging already having set in. This enables the limiting of degradation of the insulation system by the accelerators of moisture and oxygen and enables the life span of the high-voltage system to be extended. The method according to the invention is characterized in that gas is transferred from the expansion vessel to an external buffer space up to a pre-defined overpressure relative to atmospheric pressure, said gas being discharged to the atmosphere only when the pre-defined overpressure is exceeded, gas is transferred from an external buffer space to the expansion vessel down to a pre-defined underpressure relative to atmospheric pressure, with either air from the atmosphere or inert gas being fed to the buffer space only upon falling below said underpressure, wherein the buffer space volume is co-determined by a lower and an upper working temperature (T | 05-19-2011 |
