Question

While synchronising the DG Set with the utility grid, which of the condition(s) must be satisfied?
1. Voltage of DG Set must be same with the utility grid
2. Phase sequence must be same with the utility grid
3. Frequency must be same with the utility grid
4. All (1), (2) and (3) must be satisfied

Answer 1

Correct Answer - Option 4 : All (1), (2) and (3) must be satisfied

DG Set:

A Diesel Generator (DG) set is the combination of a diesel engine with an electric generator (often an alternator) to generate electrical energy.

DG sets are used in places without connection to a power grid, or as emergency power-supply, if the grid fails

Synchronising of the DG Set with the utility grid:

Synchronization is the process of matching the speed and frequency of a generator or other source to a running grid.

Conditions for Synchronization of DG Set:

Synchronization requires the following conditions.

• Phase sequence and waveform must be the same as the utility grid.
• The frequency must be the same as the utility grid.
• The terminal voltage of the DG Set must be the same as the utility grid.
• The phase angle between the DG Set and Busbar must be zero.
• The phase voltages are in phase with the utility grid