A bank of three single-phase transformers, each rated 3 0 MVA , 38 . 1 / 3 . 81 kV , are connected in Y-Δ with a balanced load of three 1 Ω , Y-connected resistors. Choosing a base of 9 0 MVA , 66 kV for the high-voltage side of the three-phase transformer. spify the base for the low-voltage side. Compute the per-unit resistance of the load on the base for the low-voltage side. Also, determine the load resistance in ohms referred to the high-voltage side and the per-unit value on the chosen base.
A bank of three single-phase transformers, each rated 3 0 MVA , 38 . 1 / 3 . 81 kV , are connected in Y-Δ with a balanced load of three 1 Ω , Y-connected resistors. Choosing a base of 9 0 MVA , 66 kV for the high-voltage side of the three-phase transformer. spify the base for the low-voltage side. Compute the per-unit resistance of the load on the base for the low-voltage side. Also, determine the load resistance in ohms referred to the high-voltage side and the per-unit value on the chosen base.
A bank of three single-phase transformers, each rated
3
0
MVA
,
38
.
1
/
3
.
81 kV
,
are connected in
Y-Δ
with a balanced load of three
1
Ω
, Y-connected resistors. Choosing a base of
9
0
MVA
,
66 kV
for the high-voltage side of the three-phase transformer. spify the base for the low-voltage side. Compute the per-unit resistance of the load on the base for the low-voltage side. Also, determine the load resistance in ohms referred to the high-voltage side and the per-unit value on the chosen base.
The rated voltages of a single-phase transformer are 2000 V and 200 V in its
primary and secondary respectively. The shunt impedance can be modelled with a
resistance of 14000 ohms in parallel with a reactance of 1100 ohm, both refer to
primary side. The primary and secondary series impedances are (0.12+j 0.35) ohms
and (0.0012+j 0.0035) ohms respectively. A load is connected to the secondary
side of transformer, draws 810 KVA with a lagging power factor of 0.85. The load
voltage is same as rated voltage, that is 200 V.
▪ Use per unit method for analysis and find the voltage on primary side in pu.
Chapter 3 Solutions
Power System Analysis and Design (MindTap Course List)
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How does a Transformer work - Working Principle electrical engineering; Author: The Engineering Mindset;https://www.youtube.com/watch?v=UchitHGF4n8;License: Standard Youtube License