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Lessons learned while applying electric protection on an offshore platform

Offshore platforms have critical and isolated electrical power supply system including large direct-online motors connected to the generation bus. This paper discusses complications involved in applying protection systems including generator and generator-transformer differentials in coordination with motor starting and motor protection for such applications. Recommendations are provided for applying effective protection system, simplification of configurations to reduce errors, access of events and records to perform diagnosis etc. using digital protection relay on an offshore platform. This paper also highlights Monitoring and Diagnosis (M&D) for the electrical assets on offshore platforms.