Three phase power can be converted to six phase power using three single phase transformers connected in a specific configuration. The primary windings of the transformers are connected in a delta configuration, while each secondary winding is split into two halves. This results in two secondary windings for each primary transformer, providing six outputs that can be connected in different configurations like double delta or double star to produce a six phase supply. Commonly, a dimetrical connection is used where one secondary winding of each transformer connects to opposite points on a six phase circuit. This produces six voltages with 60 degree phase displacements as shown in the phasor diagram.

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LABELS : POWER TRANSFORMER THEORY
Three Phase to Six Phase Conversion
SATURDAY, JUNE 18, 2011
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Basic (21)
basics of transmission and distribution (24)
In certain applications like thyristors and rectifiers six phase supply is required.
C.B devices (112)
Therefore it becomes necessary to convert three phase a.c. supply into six phase. By
using three identical single phase transformers suitably interconnected this can be
cables (21)
achieved. The primary winding is connected in delta whereas its secondary winding is
Circuit Breaker (26)
split up into two halves. Thus conversion from 3 phase to six phase can be obtained
by having two similar secondary windings for each of the primaries of the three phase
transformer. This is showing in the Fig. 1.
The three phase supply is given to primaries of the three transformers and six
phase output can be obtained from the six secondaries as shown. There are many
ways of connecting these secondaries. Some of them are i) double delta ii) double
star iii) dimetrical. The dimetrical connection is generally used in practice.
The double delta connection is shown in the Fig.2.
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POPULAR POSTS
Phasor Diagram s for
T ransform er on Load
Principle of Working of 3-Phase
Sy nchronous Motor
Sum pner's T est (Back to Back T est)

2. Fig. 1
O.C. and S.C. T ests on Single
Phase T ransform er
T hree Phase T ransform er
Phasor Groups
Open Delta or V-V Connection of
3-Phase T ransform er
Fig. 2
As seen from the Fig.2 this arrangement of secondaries connections are taken
from points 1, 3, 5 and in the second set, the connection are taken from points 2, 4
and 6.
The double star connection for obtaining 6 phase supply is shown in the Fig.3.
Ov er Current Protection and
Earth Fault Protection
Over Current Protection and Earth Fault
Protection 1. Introduction
As the
fault impedance is less than load
impedance, the fault curr...
Minim um Oil Circuit Breaker
(MOCB)
5. Description of different Circuit Breaker
5.3 Bulk Oil and Minimum Oil Circuit
Breaker 5.3.2 Minimum Oil Circuit
Breaker (MOCB)
Th...
T hree Point Starter
Buchholz Relay s
Fig. 3
Six equal voltages with a phase displacement of is obtained which is indicated in
the phasor diagram shown in the Fig. 4. The primary windings may be either
connected in delta or in star. If the primaries are connected in star then care must be
taken that the neutral point of the star connection must be connected to the neutral of
the generator to avoid the difficulties due to floating neutral and triple frequency
currents.
Fig. 4
In the case of six phase rectifier, the star point or the neutral point formed by the
coils serves as the neutral point of the d.c. supply from the rectifier.
The most commonly used connection is the dimetrical connection for three phase
to six phase transformers. It is shown in the Fig. 5. On each single phase transformer
there is only one winding on the secondary side. The two secondary leads are
Transformer Protection : Part 5

3. connected to diametrically opposite points on the armature windings of the
synchronous converter. The middle points of the secondary windings may be
connected together to form a neutral for the three wire circuit. The high voltage or
primary windings are either connected in star or delta. But delta connection is
generally preferred because of the triple frequency harmonics of voltages which are
introduced in star-star connection.
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Fig. 5
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The corresponding phasor diagram is shown in the Fig.6.
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Fig. 6
Related articles :
Open Delta or V-V Connection of 3-Phase Transformer
The T-T connection for 3-Phase Transformer
Conversion From Three Phase to Tow phase (Scott Connection)
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EagleeyeHoliday
JUNE 23, 2011 AT 2:03 AM
"Standard Transformers is a private limited company engaged in manufacture,
testing of Transformers & Rectifiers Stabilizers in the voltage class of 11 KV to 132 KV and
rating from 10KVA to 40 MVA. "
FOR MORE DETAILS VISIT http://www.standardtransformers.com/
quy Nguyen
MARCH 16, 2012 AT 2:54 PM
which terminal for newtral on primary coilds?
write articles about electrical engineering
V I EW M Y C OMP LE TE P R OFI LE
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4. akash verma
AUGUST 22, 2012 AT 4:43 AM
nice explanation
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