The refurbishment of a 60 MVAr hydrogen cooled synchronous compensator

GEC Alsthom Electrical Services have been responsible, as the main contractor, for seven synchronous compensator projects. This paper reviews the renewal and uprating of synchronous compensator 6 (SC6) for the National Grid Company at Sundon Substation near Luton. The workscope encompassed a complete rewind of both stator and field windings and the uprating of the protection and control systems. The expertise gained by GEC Alsthom Electrical Services on previous projects resulted in this project being completed within 13 months compared to a previous best of 18 months