The Factory System Test (FST) for Replica Control and Protection cubicles for Caithness-Moray-Shetland HVDC Link were performed at ABB’s test facility at Ludvika, Sweden.

The two week test schedule included Employer specified test cases using RTDS simulators. The FST set-up included all the controls, protections, interfaces, and the complete operator

interface. The HVDC system was represented in detail and consisted of all three converter stations – Blackhillock, Spittal, and Kergord.


The aim of the FST tests with Replica Control and Protection Cubicles was to ensure similar response to events as with Project Control and Protection Cubicles installed at site.

The tests followed the Integration and Verification phase after checking CAN, eTDM, LAN functionality and sequences in EWS/OWS. The tests were witnessed by the staff at The National HVDC Centre.