HV GIS Switchgear Extension in Ayer Rajah/Singapore Switchgear and Field Services from Siemens undertook the engineering, delivery, installation, and commissioning of nine GIS bays for this substation, including a local control system that is similar to the existing one. During the work, such as incorporation into the existing control system or the implementation of an additional mechanical interlocking system, there was no need for a complete substation shutdown. Customer benefits ■■ Expert services from original equipment manufacturer ■■ Know-how delivered by Siemens ■■ Extended GIS has been seamlessly integrated into the existing system Switchgear and Field Services Answers for energy. ■■ No need to train local staff on different GIS-technology ■■ Switchgear continuously in service