Question

consider a 10KVA,2300 V/460 V , single phas transformer. The primary winding resistance and reactence of this transformer is 5 ohm and 15 ohm respectively. the secondary winding resistance and reactance of this transformer is 0.5 ohm and 0.25 respectively. when the primary supply voltage is 2300V, detrmine:

a) the equivalent resistance referred to primary (Re).

b) the equivalent leakage reactance referred primary(Xe).

c)the equivalent impedance referred to primary(Ze).

d)the percentage voltage regulation for 0.6 lagging power factor.

Answer #1

A 20 kVA single phase transformer
4800/480V has primary resistance and reactance of 5Ω and 15Ω
respectively, while the resistance and reactance of secondary
winding is 0.1Ω and 0.15 Ω respectively. Calculate:
(i) The parameter referred to primary
side of transformer and draw the equivalent circuit
(ii) The approximate value of
secondary voltage at full load power factor of 0.8 lagging if 4.8kV
primary supply

. A 230/460-V transformer has a primary resistance of 0.2 Ohms
and
a resistance of 0.5 Ohms and the corresponding values for the
secondary are
0.75Ohms and 1.8 Ohms respectively. Find secondary terminal voltage
When
supplying (a) 10A at 0.8 power factor lagging (b) 10A at p.f, 0.8
leading.

A 250/125 V, 5 kVA single phase transformer has primary
resistance of 0.2 ohm and reactance of o.75 ohm. The secondary
resistance is 0.05 ohm and reactance of o.2 ohm. Determine its
regulation while supplying full load on 0.8 leading pf

A n+350-KVA 2300+n - 230+n; volt, 60-hz transformer has percent
core loss , resistance and percent leakage reactance of m+0.56 ,m+
33 and m+5.57 respectively. For 10 increments of power-factor
angle, tabulate and plot percent regulation, and efficiency. Power
factor for operation between 0.5 lagging and 0.5 leading. Use
Matlab
n=20
m=.2

current transformer with a bar primary has 250 turns
in it secondary winding. the resistance and reactance of the
secondary circuit are 1.4 ohms and 1.1 ohms respectively including
the transformer winding. when 5A current flows in the secondary
winding, the magnetism mmf is 80 AT and iron lost is 1.1w.
determine the following (i) ratio error (ii) phase angle error

A 2.2 KVA, 440---220 V, 60 Hz, step-down transformer has the
following parameters: Rp= 3.0 Ω, Xp= 4.0 Ω, Rs= 2.5 Ω, Xs= 2.0 Ω,
Rc= 60 KΩ, and Xm = 15 KΩ. The transformer is operating at full
load with a power factor of 0.707 lagging. The magnetizing branch
impedance can be ignored.
a) Draw the transformer’s equivalent T-circuit,
b) Find the equivalent winding impedance referred to the high
side,
c) Calculate the primary and secondary currents,
d) Determine...

Problem 1: Consider a transformer with a turns ratio of
4000/120, with a primary coil resistance R1 = 1.6 (?), a secondary
coil resistance of R2 = 1.44 (m?), leakage flux that corresponds to
the inductance L1 = 21 (mH), and inductance L2 = 19 (?H), and a
realistic core characterized by the core resistance Rc = 160 (k?)
and the magnetizing inductance Lm = 450 (H). The low-voltage side
of the transformer is at 60 (Hz), and V2 =...

Consider a 15/5 A CT with primary winding number of
turns of 37 and secondary winding number of turns of 119 . The
secondary winding resistance is given as 0.154 ohms and the
secondary winding reactance is known as 0.201 ohms. CT- Relay
connecting lead resistance is 0.17 ohm. The magnitizing AT is 13.8
and the loss AT is 10.2 . The Burden is defined as 15 VA at 5A with
pf of 0.6 lag.
a) Find the ratio error...

Consider the transformer shown in Fig. 5-15a, neglecting the
winding resistances, leakage inductances and the core loss.
N1/N2=3. For a voltage of 114V (rms) at a
frequency of 60 Hz applied to winding 1, the magnetizing current is
1.4A (rms). If a load of 1.4Ω at a power factor 0.849 lagging is
connected to the secondary winding, calculate the magnitude of
I1.

2(a). A transformer has a primary-to-secondary turns ratio of
100:1. The voltage on the primary side is 27.7 kv.a.c. at 60.0 Hz (
assume 60.0 Hz when treating electric power topics). A load is
connected across the secondary winding. Assuming that the
transformer is ideal, what voltage is developed to the load?
Briefly show your work. Sketch a diagram.
2(b). The load of part a is a 2.00-ohm load. How much current
does the load draw from the transformer’s secondary...

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