The gas insulated metal-enclosed switchgear(GIS)long busbar will sustain the problems of bushing dis-placement and local stress concentration during operation due to the influences such as installation status
climate
and environment. In this study
a GIS long busbar displacement monitoring system was developed to monitor the axi-al
radial and vertical displacement of the busbar bushing in real time. This monitoring system can also make multi-dimensional analysis based on the collected data to predict the displacement trend. It is expected that this monitoringsystem can facilitate maintenance and safe operation of the GIS long Busbar.