Measuring gas density in gas insulated systems - involves using special heating wire or functional wire to measure heat transport as measure for gas density

摘要

The heat transport through the insulating gas i.e. SF6, is detected as a measure of its density. A heated wire (D) in the monitored gas vol. carries a constant current (I) and its change in potential drop is detected as the measure of the gas density. In gas-filled devices e.g. lamps, the wire which is already present in the device to perform its functionality is used as the heating wire and hence as the measurement probe. The monitored gas vol. has an associated gas measurement vol. contg. the heating wire and connected to the monitored vol. via a pressure equalising elastic membrane. USE/ADVANTAGE - Esp. for systems insulated with SF6 gas. The method enables gas to be measured more simply than with conventional techniques.