Two of the three platforms generated power for to supply all three platforms. Marathon Oil proposed to decommission one of the platforms which operated with three Gas Turbine Generators and the remaining generating platform supporting the non generating platform. The power management system that manages the power flow between all three platforms was complex.
Marathon Oil requested EPS to carry out a number of transient motor starting scenarios to determine whether the existing 33 kV power network would enable a 4.35 MW motor to start on their East Brae platform. The main concern was whether the limited power generation would maintain a voltage within a transient starting voltage dip limitation of no less than 20%.
At the time Marathon Oil did not have a detailed work scope, EPS assisted in creating a work scope in the form of a project plan, the plan consisted of a structured logical plan to help Marathon achieve decommissioning of the Bravo within a certain time period. EPS set and achieved the realistic delivery dates for the following activities:
Load flow, short circuit and protection analysis with an arc flash study revision followed.