electrical429
Electrical
- Nov 13, 2019
- 51
I understand transformer vector groups, however I get confused when it comes to changing phase order outside the transformer to change it's vector group. For example the following statement:
"For this connection the outer HV phase conductors are effectively swapped, with phase Red connected to transformer terminal C and phase Blue connected to transformer terminal A. This needs to be repeated on the LV side of the transformer to obtain a conventional vector group. Swapping the conductors in this way reverses the effect of the transformer, achieving an effective Yd1 vector group from a Yd11 transformer. This is called a negative sequence connection."
or
"Similarly a Yd8 can be achieved from a Yy0 by rolling the conductors from R -> Y -> B."
"For this connection the outer HV phase conductors are effectively swapped, with phase Red connected to transformer terminal C and phase Blue connected to transformer terminal A. This needs to be repeated on the LV side of the transformer to obtain a conventional vector group. Swapping the conductors in this way reverses the effect of the transformer, achieving an effective Yd1 vector group from a Yd11 transformer. This is called a negative sequence connection."
or
"Similarly a Yd8 can be achieved from a Yy0 by rolling the conductors from R -> Y -> B."