The delta – delta transformer is applicable where
large current requires on low voltage supply and continuity of supply is
possible in spite of one phase fails.
Advantages
- No phase displacement between primary winding and secondary winding
- The third harmonic component of magnetizing current flows in the phase winding but does not flows through line therefore there is no distortion of flux.
- As the phase current is 1 / √ 3 times the line current, the cross section of the conductor reduces.
- Unbalanced loading does not create any problem on the secondary side of transformer.
- Continuity of supply is possible in spite of one winding becomes faulty, the remaining two winding carry only 57.7% load. It is called as open delta connection.
Disadvantages
- As the phase voltage and line voltage is equal in magnitude, more insulation requires for phase winding as compared to star connection.
- If one of the line gets earthed, the maximum voltage between winding and core will be equal to line voltage
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