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To connect an incoming alternator to a running alternator certain conditions must be satisfied for synchronism. Which of the following is NOT one of the conditions?

To connect an incoming alternator to a running alternator certain conditions must be satisfied for synchronism. Which of the following is NOT one of the conditions? Correct Answer Power factor must be equal

Two alternators running parallel:

Let two alternators are running in parallel with excitation E1 and E2 respectively.

Additional Information

Effect of change in Excitation:

  • To balance the offset voltage of an operational amplifier, a small DC voltage is applied to input terminals where the connection is series with non-inverting input.
  • If the excitation of an alternator operating in parallel with other alternators is increased above its normal value of excitation,
  • Its power factor changes in the lagging direction and its current output increases with no appreciable change in its kW load.
  • Likewise, if the generator is excited its power factor becomes more leading and its current output increases with no change in kW output.
  • This increase in current, in either case, is not supplied to the load but circulates between the alternators connected to the system, and the current which circulates is called the Circulating current.
  • Thereby increasing their losses and reducing their useful capacity.
  • It is desirable in most cases, therefore, to operate each alternator at the same power factor (at or near the power factor of the load) keeping the circulating current to the minimum.

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