Which of the following connections in a three-phase transformer is called open-delta connection?
Which of the following connections in a three-phase transformer is called open-delta connection?
Right Answer is:
V-V
SOLUTION
V-V connections in a three-phase transformer are called open-delta connection.
Open-delta connection:
- An open delta connection transformer uses two single-phase transformers to provide a three-phase supply to the load.
- An open delta connection system is also called a V-V system.
- Open delta connection systems are usually only used in emergency conditions when one of the transformers in the Delta-Delta system is damaged, and removed from service.
- Efficiency for the operation of open delta connection is low as compared to delta-delta systems which are used during standard operations.
- The total load supplied by the open delta system is 57.77% of the closed delta system.