Abnormality monitoring method for gas filled electrical equipment

摘要

PURPOSE:To enable detecting a slight abnormality such as local heating by mixing a monitor gas expressed by CnF2n+1SF5 with an insulating gas and by detecting the decomposition products of said monitor gas generated due to the abnormality of an electrical equipment body. CONSTITUTION:To constitute this equipment, an inert, incombustible insulating gas 6 such as an SF6 gas for insulating or cooling a transformer body 5 and a monitor gas 7 expressed by CnF2n+1SF5, for example, CF3SF5 are sealed in a tank 1. When a local heating occurs by a generation of heat due to an insulation deterioration and the like in this constitution and the temperature of said heating reaches about 150-200 deg.C, the monitor gas 7 thermally decomposes to generate CF4 though the insulating gas 6 itself does not commence a thermal decomposition reaction. Also, when a partial discharge such as corona arc occurs by the insulation deterioration, the monitor gas 7 decomposes so that CF4, C2F6, C3F8 are generated. Therefore, when said decomposition products are detected by a monitor 14, the abnormality of said transformer body 5 can be known in the forerunning stage of failure.