three phase

A three phase transformers must have 3 coils or windings connected in the proper sequence in order to match the incoming power and therefore transform the power company voltage to the level of voltage we need and maintain the proper phasing or polarity. Three phase transformers is a common for electric power transmission. There are benefits to three phase power: First, all three wires can carry the same current. Secondly, power transfer is constant into a linear and balanced load.

Three Phase Transformer Connections:

Delta to Delta - use: industrial application
Delta to Wye - use: most common, commercial and industrial
Wye to Delta - use: high voltage transmissions
Wye to Wye - use: rare, causes harmonics and balancing problems.

Three phase transformers are connected in delta or wye configurations. A wye-delta transformer has its primary winding connected in a wye and its secondary winding connected in a delta. A delta-wye transformer has its primary winding connected in delta and its secondary winding connected in a wye.

Delta Connections:

A delta system is a good short-distance distribution system. Only one voltage is available between any two wires in a delta system. The delta system can be illustrated by a simple triangle. A wire from each point of the triangle would represent a three-phase, three-wire delta system, the voltage would be the same between any two wires.

Wye Connections:

In a wye system the voltage between any two wires will always give the same amount of voltage on a three phase systems. However the voltage between any one of the phase conductors and the the neutral will be less than the power conductors. In a wye system, the voltage between any two power conductors will always be 1.732 times the voltage between the neutral and any one of the power phase conductors. The phase-to-ground voltage can be found by dividing the phase-to-phase voltage by 1.732.

Open Delta Connection:

The open delta transformer connection can be made with only two transformers instead of three. The voltage and current values of an open delta connection are computed in the same manner as a standard delta-delta connection when three transformers are used.

Please choose Aluminum Coil or Copper Coil