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Three-Phase Transformer Design (Geometry. Delta/Wye
Connections, and Many More)
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Transformer Design (Geometry, Delta/Wye Connections, and Many More)
Introduction to 3-phase trasformer
Three-phase power is used almost exclusively for generation, transmission, and distribution, as well as for all industrial
uses. It is also used on aircraft, both commercial and military. It has many advantages over single-phase power.
Three-Phase Transformer Design (Geometry, Delta/Wye Connections, and Many
More)
The transformer can be made smaller and lighter for the same power handling capability, because the copper and iron
are used more effectively.
In circuitry, for conversion from AC to DC, the output contains a much lower ripple amplitude, and a higher frequency
component, which is 3 times and 6 times the line frequency, and which, in turn, requires less filtering.
Primary Circuit
The two most commonly used primary circuits for three-phase transformers are the Star, or Y connection, as shown in
Figure 1a, and the other being known as the Delta (A) connection, as shown in Figure 1b.
The design requirement for each particular job dictates which method of connection will be used.
Stop
b. Delta Connection
a. Star Connection
Figure 1 - a. Three-
Phase Transformer,
Connected in Star; b.
Three-Phase Transformer, Connected in Delta
Comparing Transformer, Physical Size
The schematic diagram in Figure 2, shows the connection of three single-phase transformers operating from:
a. 3-phase power source and a single three-phase transformer; and
b. 3-phase power source connected in a delta-delta configuration.
The single three-phase transformer T4, would be lighter and smaller than a bank of three single-phase transformers of the
same total rating.
Three-Phase, 3 Wire
Delta Input
Iliree- Phase, 3 Wire Delta Output
Since the windings of the three-phase transformer are placed on a common
magnetic core, rather than on three independent cores, the
consolidation results in an appreciable saving in the copper, the core,
and the insulating materials.
Figure 2 - Comparing Three Single-Phase Transformers Connected in Three-
Phase Delta
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Three-Phase Transformer Design (Geometry, Delta/Wye Connections, and Many More) -
Title:
Colonel Wm.; T. McLyman
Format: PDF
Size: 330 KB
Pages: 18
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Introduction
Three-phase power is used almost exclusively for generation, transmission, and distribution, as well as for all
industrial uses It is also used on aircraft, both commercial and military It has many advantages over single-phase
power. 1 he transformer can he made smaller and lighter for the same power handling capability, because live
copper and iron arc used more effectively. In circuitry, for conversion from ae to dc, the output contains a much
lower ripple amplmidc, and a higher frequency component, which is > times and 6 times the line frequency, and
which, in turn, requires less filtering.
Primary Circuit
The twxi most commonly used primary circuits for three-phase transformers are the Star, or Y connection, as
shown in figure 12-1. and the other being known as the Delta (A) connection, as shown m Figure 12-2 The design
requirement for each particular job dictates which method of connection w ill be used
Figure 12-1. Three-Phase Transformer, C onnected in Star
Figure 12-2. Three-Phase Transformer. Connected in Delta
Three-Phase Transformer Design (Geometry, Delta/Wye
Connections, and Many More)
Stop
