Three-phase Transformer Connections

Three-phase Transformer Connections

Three-Phase Transformer Connection Procedure in Electrical Energy Transmission

The three-phase transformer consists of three transformers either separate or combined with one core. The primary and secondary of the transformer can be independently connected either in the star or delta. There are four possible connections for a 3-phase transformer bank.

Single-phase three transformers or three single cores in a three-phase transformer are mainly connected in Delta or Star way to form a three-phase transformer.

The most common uses of three-phase transformer connection are as below:
  1. Delta – DeltaΔ – Δ (Delta – Delta) Connection;
  2. Star – DeltaΥ – Υ (Star – Star) Connection;
  3. Delta – StarΔ – Υ (Delta – Star) Connection;
  4. Star – Delta:Υ – Δ (Star – Delta ) Connection.

Also, there are some special connection arrangements for three-phase transformer connection, like-

Three-phase Transformer Line Voltage and Current

The relationship between the three-phase transformer connection in primary and secondary, line voltage in primary and secondary windings, and line current in the primary and secondary end is as below:
Line Voltage
Primary or Secondary
Line Current
Primary or Secondary
Delta – Delta
delta-delta line voltage
delta-delta line current
Delta – Star
delta-star line voltage
delta-star line current
Star – Delta
star-delta line voltage
star-delta line current
Star – Star
star-star line voltage
star-star line current

If you are interested to learn more details about transformers, you may go to the transformer index.

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