Question

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

Answer #1

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...

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

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.

An ideal transformer has 150 turns on the primary winding and
600 turns on the secondary. If the primary is connected across a
110V generator, what is the output at the secondary?
A: 110V
B: 220V
C: 440V
D: 880V
Please show work

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. Assume that the transformer is
ideal.
(a) Suppose that the electric utility supplied 27.7 kv.d.c.
rather than 27.7 kv.a.c. How much power would the transformer’s
secondary winding deliver to the load in this case?
(b). The transformer’s primary winding is supplied by...

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...

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 single-phase transformer has 2400 turns on the primary and 600
turns on the secondary. Its no-load current is 4A at a power factor
of 0.25 lagging. Assuming the volt drop in the windings is
negligible, calculate the primary current and power factor when the
secondary current is 80A at a power factor of 0.8 lagging.

. 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.

An ideal step-down transformer has a primary coil of 370 turns
and a secondary coil of 25 turns. Its primary coil is plugged into
an outlet with 115 V(AC), from which it draws an rms current of
0.69 A.
What is the voltage in the secondary coil?
Calculate the rms current in the secondary coil.
Assuming that the transformer secondary is driving a resistive
load, calculate the average power dissipated in the resistor.

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