The captive power plant (CPP) in the Onshore Gas Terminal (OGT) is set up to meet the power and steam requirements of the process and utility systems in the OGT complex.
The CPP is equipped with two M/S GE make Frame-V Gas Turbine Generators (GTG) of capacity 20.5 MW each; both the GTGs would be in operation each operating at part load as per the design philosophy.
The hot flue gas from each GTG is diverted to the respective HRSG (Heat Recovery Steam Generator) to produce process steam.
Each HRSG is equipped with a supplementary firing system and is designed to meet the peak load of 66 TPH of High-Pressure steam generation (36 Kg/cm, 256 Deg°C).
Both the HRSGs would be operating at part load. CPP is also equipped with fuel gas conditioning skids to ensure the quality of fuel gas used in GTG.
Recently the Captive power plant has tripped on —DATE— at 05.55 hrs on electrical protection (earth fault).
On —date— Gas turbine-2 which was running at normal operating conditions tripped due to electrical protection generated from generator relay protection panel at 05.55 hrs lead to production loss.
The generator is provided with electrical protection on stator earth fault of 1N>1. EDG failed to start automatically due to PMCC-1 (Emergency PMCC) normal incomers didn’t trip during a blackout.
The incomers were switched on manually and the Emergency diesel generator was started.
Mark Vie system sequence of events
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