During installation of a generator, one must carefully ensure that the generator terminals and all control wirings are correct so that the order of __________ matches the system.

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 1
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  1. Frequency sequence
  2. Phase sequence
  3. Amplitude sequence
  4. Power sequence

Answer (Detailed Solution Below)

Option 2 : Phase sequence
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  • Waveform and phase sequence is fixed by the construction of the generator and its connections to the system.
  • During the installation of a generator, careful checks are made to ensure that the generator terminals and all control wiring are correct so that the order of phases (phase sequence) matches the system.
  • Connecting a generator with the wrong phase sequence will result in a short circuit as the system voltages are opposite to those of the generator terminal voltages.
  • The voltage, frequency, and phase angle must be controlled each time a generator is to be connected to a grid.
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