Type of Connection
Below are listed various connections and their corresponding transformers.
Delta primary, Delta Secondary
Low-power primary distribution
Star primary, Delta Secondary
Step down transformer
Delta primary, Star secondary
Star primary, Star secondary
Small high-voltage transformers
The secondary side connection also offers a reliable neutral point for loads in the secondary distribution network, making the delta-star connection the most cost-effective for step-up applications (transmission side). Both step-down (distribution side, low voltage) and step-up (transmission side, high voltage) applications are common in which the connector is used.
The type of connection generally used at the beginning of high tension transmission line is - (a) delta-delta (b) Start-star (c) star-delta (d) delta-star
The delta-star connection type is typically utilized at the start of a high-tension transmission line. This is done by utilizing a step-up transformer. The beginning of the high-tension transmission line's primary side has low voltage, whereas the secondary side has high voltage.