1- A 3-phase 400KVA, 11000/416 transformer is delta-connected on the primary and star connected on the secondary. The primary resistance / phase is 4.3 2 and secondary resistance/phase is 0.0022. if the iron loss is 990 watts. Determine the full load copper losses. 2- A three-phase transformer has 3300/400 V, D/Y connected and working on 50Hz. The line current on the primary side is 12A and secondary has a balanced load at 0.8 lagging p.f. Determine the, i) Secondary phase voltage ii) Line current iii) Output power 4 * Remember For 中 3phase Tr 1-Connected system connected system. A- * 34 = 3 V I 2... COS = S34 зиф 9 = FL = √3 3 P3 = 3 * Zba = 3 Ye baze 3+ * Any given Power is 3phase * Any Jiven voltage I S Lone が is chosen base Upase S chosen Power: P oltage according to Rating of Tr. ording For A-D sr 人一人 3ph Tr the same as the problem. For A-1 3ph T to Vp/Vs Ratio a Vp/Vs a = Vē ·For A-D 3ph Tr √3

Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter3: Power Transformers
Section: Chapter Questions
Problem 3.10P: A single-phase step-down transformer is rated 13MVA,66kV/11.5kV. With the 11.5 kV winding...
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1- A 3-phase 400KVA, 11000/416 transformer is delta-connected on the primary and star connected on the
secondary. The primary resistance / phase is 4.3 2 and secondary resistance/phase is 0.0022. if the iron loss
is 990 watts. Determine the full load copper losses.
2- A three-phase transformer has 3300/400 V, D/Y connected and working on 50Hz. The line current on the
primary side is 12A and secondary has a balanced load at 0.8 lagging p.f. Determine the,
i) Secondary phase voltage
ii) Line current
iii) Output power
Transcribed Image Text:1- A 3-phase 400KVA, 11000/416 transformer is delta-connected on the primary and star connected on the secondary. The primary resistance / phase is 4.3 2 and secondary resistance/phase is 0.0022. if the iron loss is 990 watts. Determine the full load copper losses. 2- A three-phase transformer has 3300/400 V, D/Y connected and working on 50Hz. The line current on the primary side is 12A and secondary has a balanced load at 0.8 lagging p.f. Determine the, i) Secondary phase voltage ii) Line current iii) Output power
4
*
Remember
For
中
3phase Tr
1-Connected system
connected system.
A-
* 34 =
3 V
I
2...
COS
=
S34
зиф
9
=
FL = √3
3
P3
=
3
*
Zba
=
3 Ye
baze
3+
*
Any
given
Power
is
3phase
*
Any
Jiven
voltage
I S
Lone
が
is
chosen
base
Upase
S
chosen
Power:
P
oltage
according to Rating of Tr.
ording
For
A-D
sr
人一人
3ph Tr
the same
as
the problem.
For
A-1 3ph
T
to
Vp/Vs Ratio
a
Vp/Vs
a
=
Vē
·For A-D 3ph Tr
√3
Transcribed Image Text:4 * Remember For 中 3phase Tr 1-Connected system connected system. A- * 34 = 3 V I 2... COS = S34 зиф 9 = FL = √3 3 P3 = 3 * Zba = 3 Ye baze 3+ * Any given Power is 3phase * Any Jiven voltage I S Lone が is chosen base Upase S chosen Power: P oltage according to Rating of Tr. ording For A-D sr 人一人 3ph Tr the same as the problem. For A-1 3ph T to Vp/Vs Ratio a Vp/Vs a = Vē ·For A-D 3ph Tr √3
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