Power Systems
The incremental fuel costs for two generating units G1 and G2 are given by Ic1 = 25 + 0.2 PG1 and Ic2 = 32 + 0.2 PG2, where PG1 and PG2 are real powers generated by the units. The economic allocation for a total load of 250 MW, neglecting transmission loss, is given by

 PG1 = 100 MW and PG2 = 150 MW
 PG1 = 125 MW and PG2 = 125 MW
 PG1 = 142.5 MW and PG2 = 107.5 MW
 PG1 = 109.75 MW and PG2 = 140.25 MW

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Power Systems
In a biased differential relay the bias is defined as the ratio of

  operating coil current and restraining coil current.
  fault current and restraining coil current.
  fault current and operating coil current.
  number of turns of restraining and operating coil.

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