ABSTRACT
With vigorous development of the electric power industry and the growing demand of electricity, Gas Insulated Switchgear (GIS) has been widely used in the power systems [1]. However, overheating of the contacts and the lead conductor will result in reduced allowable load flow, and may cause insulation degradation or even breakdown accident of the other parts [2-3]. According to previous statistics available, there have been varying degrees of abnormal temperature changes caused by poor contacts in the enclosed isolation switch, and cable joints of the GIS equipments [4]. Hence, realization of on-line temperature monitoring of the GIS contacts as to identify or eliminate the developing thermal deficiency prior to severe failure plays an irreplaceable significant role for safe and reliable operation of the GIS equipment.
