Consider three ideal single-phase transformers (with a voltage gain of η ) put together as Δ − Ω three-phase bank as shown in Figure 3.35. Assuming positive-sequence voltages for V a η , V b η , and V c η find V a ' η ' , V b ' η ' , and V C ' η ' . in terms of V a η , V b η , and V c η , respectively. (a) Would such relationships hold for the line voltages as well? (b) Looking into the current relationships, express I ' a ' I ' b ' and I ' c in terms of I a ' I b ' and I c ' respectively. (C) Let S ’ and S be the per-phase complex power output and input. respectively. Find S ’ in terms of S .
Consider three ideal single-phase transformers (with a voltage gain of η ) put together as Δ − Ω three-phase bank as shown in Figure 3.35. Assuming positive-sequence voltages for V a η , V b η , and V c η find V a ' η ' , V b ' η ' , and V C ' η ' . in terms of V a η , V b η , and V c η , respectively. (a) Would such relationships hold for the line voltages as well? (b) Looking into the current relationships, express I ' a ' I ' b ' and I ' c in terms of I a ' I b ' and I c ' respectively. (C) Let S ’ and S be the per-phase complex power output and input. respectively. Find S ’ in terms of S .
Solution Summary: The author explains that the relationships followed by phase voltages are not true for line voltage.
Consider three ideal single-phase transformers (with a voltage gain of
η
) put together as
Δ
−
Ω
three-phase bank as shown in Figure 3.35. Assuming positive-sequence voltages for
V
a
η
,
V
b
η
, and
V
c
η
find
V
a
'
η
'
,
V
b
'
η
'
, and
V
C
'
η
'
. in terms of
V
a
η
,
V
b
η
, and
V
c
η
, respectively.
(a) Would such relationships hold for the line voltages as well?
(b) Looking into the current relationships, express
I
'
a
'
I
'
b
'
and
I
'
c
in terms of
I
a
'
I
b
'
and
I
c
'
respectively.
(C) Let
S
’
and S be the per-phase complex power output and input. respectively. Find
S
’
in terms of S.
In single phase transformer, if the primary turns N1 is greater than the secondary turns N2, then what is the relation between V1 and V2?
a.V1 < V2
b.V2 > V1
c.V1 > V2
d.V1 = V2
In single phase transformer, if the secondary turns N2 is greater than the primary turns N1, then what is the relation between V2 and V1?
O a. V2 = V1
O b. V2 > V1
O c. V1 < V2
O d. V2 < V1
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