This blog contain about the WYE - DELTA TRANSFORMATION
WYE - DELTA TRANSFORMATION
A delta-wye transformer is a type of three-phase electric power transformer design that employs delta-connected windings on its primary and wye/star connected windings on its secondary. A neutral wire can be provided on wye output side. It can be a single three-phase transformer, or built from three independent single-phase units. An equivalent term is delta-star transformer. Delta-wye transformers are common in commercial, industrial, and high-density residential locations, to supply three-phase distribution systems.
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WYE to DELTA and DELTA to WYE CONVERSION
In many circuits, resistors are neither in series nor in parallel, so the rules for series or parallel circuits described in previous chapters cannot be applied. For these circuits, it may be necessary to convert from one circuit form to another to simplify the solution. Two typical circuit configurations that often have these difficulties are the wye (Y) and delta ( D ) circuits. They are also referred to as tee (T) and pi ( P ) circuits, respectively.
Delta and wye circuits:
And the equations for converting from delta to wye:
The equations can be presented in an alternate form based on the total resistance (Rd) of R1, R2, and R3 (as though they were placed in series):
Rd = R1+R2+R3
and:
RA = (R1*R3) / Rd
RB = (R2*R3) / Rd
RC = (R1*R2) / Rd
Wye and delta circuits:
And the equations for converting from wye to delta:
An alternate set of equations can be derived based on the total conductance (Gy) of RA, RB, and RC (as though they were placed in parallel):
Gy = 1/RA+1/RB+1/RC
and:
R1 = RB*RC*Gy
R2 = RA*RC*Gy
R3 = RA*RB*Gy
LEARNING
This week we tackled about the wye - delta transformation. I learned that the Wye networks are some times called T networks and Delta networks are occasionally called P networks. Wye and Delta Networks have 3 terminal arrangements commonly used in power systems. T and P 2 of the terminals are connects at one node. The node is a distributed node in the case of the P network.
