The scenario
A refinery captures waste heat to drive a 9.8 MW back-pressure steam turbine generator at 6.6 kV, operating in parallel with a 132 kV grid intake to supply process and auxiliary loads.
What is in this drawing
Read the decisions behind it.
01
Use 132/6.6 kV 25 MVA grid transformer for grid infeed
02
Connect STG through dedicated 1250 A breaker and CT to the 6.6 kV main bus
03
Provide 6.6/0.4 kV auxiliary transformer for 400 V plant auxiliaries
04
Split 6.6 kV bus with a bus tie for standby/refinery feeder isolation
Reuse for industrial cogen/CHP plants where a waste-heat STG, grid import, and multiple process/auxiliary feeders share a medium-voltage bus.
More like this
Other examples in this family.
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