This project involved development support for a submarine cable system connecting the Khanom substation to the Koh Samui substation in Surat Thani province. The project is described as a 230 kV submarine cable system with a total length of 50 kilometres, aimed at enhancing reliability of power supply to an island network where increasing demand and ageing cable assets have led to frequent outages.

The scope covered comprehensive verification of submarine and underground power cables and included equipment rating studies and confirmation of shunt reactor requirements. Advanced system impact studies were carried out using DIgSILENT PowerFactory software and included load flow studies and short circuit analysis, transient stability assessment, small signal stability assessment, voltage stability review, generator self-excitation analysis, ferro resonance evaluation and protection scheme review. The project documentation also refers to study outputs supporting a 220 kV submarine cable system design, and all technical reports covering stability, stress and ferro resonance assessments were reviewed and approved as part of the assignment deliverables.

TCE's Scope