A single-phase, 50-kVA, 2400/240-V, 60-Hz distribution transformer has the following parameters: Resistance of the 2400-V winding: R 1 = 0.75 Ω Resistance of the 240-V winding: R 2 = 0.0075 Ω Leakage reactance of the 2400-V winding: X 1 = 1.0 Ω Leakage reactance of the 240-V winding: X 2 = 0.01 Ω Exciting admittance on the 240-V side = 0.00 3 − j 0.0 2 S (a) Draw the equivalent circuit referred to the high-voltage side of the transformer. (b) Draw the equivalent circuit referred to the low-voltage side of the transformer. Show the numerical values of impedances on the equivalent circuits.
A single-phase, 50-kVA, 2400/240-V, 60-Hz distribution transformer has the following parameters: Resistance of the 2400-V winding: R 1 = 0.75 Ω Resistance of the 240-V winding: R 2 = 0.0075 Ω Leakage reactance of the 2400-V winding: X 1 = 1.0 Ω Leakage reactance of the 240-V winding: X 2 = 0.01 Ω Exciting admittance on the 240-V side = 0.00 3 − j 0.0 2 S (a) Draw the equivalent circuit referred to the high-voltage side of the transformer. (b) Draw the equivalent circuit referred to the low-voltage side of the transformer. Show the numerical values of impedances on the equivalent circuits.
Solution Summary: The author illustrates the circuit referred to the high voltage side of transformer. The value of exciting admittance is given as l
A single-phase,
50-kVA, 2400/240-V, 60-Hz
distribution transformer has the following parameters:
Resistance of the 2400-V winding:
R
1
=
0.75
Ω
Resistance of the 240-V winding:
R
2
=
0.0075
Ω
Leakage reactance of the 2400-V winding:
X
1
=
1.0
Ω
Leakage reactance of the 240-V winding:
X
2
=
0.01
Ω
Exciting admittance on the 240-V side
=
0.00
3
−
j
0.0
2 S
(a) Draw the equivalent circuit referred to the high-voltage side of the transformer.
(b) Draw the equivalent circuit referred to the low-voltage side of the transformer. Show the numerical values of impedances on the equivalent circuits.
Seconday winding of transformer is made-up of
material.
O insulated CRGO conductor
O insulated copper conductor
O Cold Rolled Grain Oriented (CRGO) conductor
Cold Rolled Grain Oriented (CRGO) Silicon
Steel
A single-phase transformer has a voltage ratio on open circuit of 7900/660 V. The
primary and secondary resistances are 0.55 ohm and 0.035 ohm respectively.
The corresponding leakage reactances being 4.22 ohm and 0.18 ohm. The load is
equivalent to a coil of resistance 3.85 ohm and inductive reactance of 4.2 ohm.
Determine the terminal voltage of the transformer and the output in kW when
supplying a given load using approximate equivalent circuit when the applied
voltage is 7912 V.
Your answer
2. A 60-Hz single-phase transformer has a turns ratio (a = Nı/N2) of 0.5. The resistive load on the
secondary is 48 N.
Primary winding resistance: R1 = 0.25 N
Secondary winding resistance: R2 = 2.2 N
Primary winding leakage reactance: X1 = 2.02
Secondary winding leakage reactance: X2 = 5.0 2
Exciting admittance: Negligible
If the applied voltage at the terminals of the primary is 2400 V, determine V2 at the load
terminals of the transformer, neglecting magnetizing current.
a.
b. If the voltage regulation is defined as the difference between the voltage magnitude at the
load terminals of the transformer at full load and at no load in percent of full-load voltage
with input voltage held constant, compute the percent voltage regulation.
Chapter 3 Solutions
Power System Analysis and Design (MindTap Course List)
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