 |
|
| Connection STELLA - STELLA, Group Yy0 - Group Yy6 | |
|
Relatively less used because of a tension instability
of the nautral point due to: a - single-phase loads connected between line and neustral b - differences in the magnetization currents c - currents of third harmonic |
 |
| ab-ac-bc linked secondary
tension an-bn-cn stellar secondary tension |
|
| Connection TRIANGOLO - STELLA, Group Dy11 - Group Dy5 | |
| It is one of the most used connections, used also for the distribution transformers because it offers all benefits due to the secondary neutral and none of the disadvantages of the connection star-star. Furthermore the triangle at the primary guarantees a correct magnetization of the nucleus and a secondary tension through sinusoidal. |  |
| With reference to the linked and stellar secondary tensions, it goes for the connection star-star. | |
| Connection TRIANGLE - TRIANGLE, Group DdO - Group Dd6 | |
| A less used connection the two previous ones because
it has the disadvantage of not having the neutral at the secondary
(it does not enable to use a stellar tension). As regards to the working, the connection triangle-triangle offers the possibility of a free circulation of the currents of third harmonic of excitation without them showing outside the terminals. |
 |
| In this type of connection it is not possible to use the star connected tension being without neutral. | |
