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Pole mounted transformers are
typically single-phase. However, vector designations determine
the number of primary bushings and how the transformers can be
connected in a three-phase bank.
EXAMPLES:
7620/13200Y - indicates a two-bushing
primary; the transformer's primary winding is rated for 7620V;
used individually, it should be connected between one phase and
the neutral of a 13200Y system; can be connected with two identical
transformers in a three-phase bank in two ways; (1) the most
common is a 13200Y bank, (2) but can also be connected 7620 Delta
13200GY/7200 - indicates a one-bushing
primary; the transformer's primary winding is rated for 7620V;
should be connected between one phase and the neutral of a 13200Y
system
13200 - This is the most common
way voltages are designated but it does not indicate how the
transformer will be connected. If the vector cannot be clarified,
we will quote the transformer based on a voltage of 13200/22900Y. |
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