Method for monitoring unusual signs in gas-charged apparatus

摘要

A method for monitoring unusual signs such as partial heatings and partial electric discharges in an apparatus to be monitored, in which a sealed gas is enclosed into a tank containing the apparatus, and at least one of monitor gases represented by formulas (I) and (II),P PC.sub.n X.sub.2n (I)PPC.sub.n X.sub.2n+2 (II) PPwherein X is at least one of H, F, Cl, Br and I, and n is one of 2, 3, 4 and 5, is charged into the tank, and in which a reaction product gas of the monitor gas, generated due to an abnormality of the apparatus to be monitored, is detected using a detector. A gas- charged apparatus including an unusual sign monitor is also disclosed.