A single-phase 50-kVA, 2400/240-volt, 60-Hz distribution transformer has a 1-ohm equivalent leakage reactance and a 5000-ohm magnetizing reactance referred to the high-voltage side. If rated voltage is applied to the high-voltage winding, calculate the open-circuit secondary voltage. Neglect I 2 R and G c 2 V losses. Assume equal series leakage reactances for the primary and the referred secondary.
A single-phase 50-kVA, 2400/240-volt, 60-Hz distribution transformer has a 1-ohm equivalent leakage reactance and a 5000-ohm magnetizing reactance referred to the high-voltage side. If rated voltage is applied to the high-voltage winding, calculate the open-circuit secondary voltage. Neglect I 2 R and G c 2 V losses. Assume equal series leakage reactances for the primary and the referred secondary.
A single-phase
50-kVA,
2400/240-volt,
60-Hz
distribution transformer has a
1-ohm
equivalent leakage reactance and a
5000-ohm
magnetizing reactance referred to the high-voltage side. If rated voltage is applied to the high-voltage winding, calculate the open-circuit secondary voltage. Neglect
I
2
R and
G
c
2
V
losses. Assume equal series leakage reactances for the primary and the referred secondary.
Three transformers, e ach rated 25 MVA, 38. 1 /3.81 kV, are connected Star – Delta
with a balanced load of three 0.79 ohm (load resistance RL) star connected resistors.
Choose a base of 75 MVA, 66 kV for the high-voltage side of the transformer and
specify the base for the low-voltage side. Determine the per-unit resistance of the load
on the base for the low-voltage side. Then, determine the load resistance RL in ohms
referred to the high-voltage side and the per-unit value of this resistance on the
chosen base.
Solve it...
A 150 kVA, 2500/250 V, 50 Hz, single phase transformer has a no-load current of 0.75 A and a core loss of 850 W, when the high voltage side is energized at rated voltage and a frequency. Determine the following :
1) The core loss component of no-load current
2) The magnetizing component of the no-load current
3)The core loss resistance on the high voltage side in ohm
4)The magnetizing resistance on the high voltage side in ohm
Chapter 3 Solutions
MindTap Engineering for Glover/Overbye/Sarma's Power System Analysis and Design, 6th Edition, [Instant Access], 1 term (6 months)
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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