Tests on a 10 kVA 11 000/240 V, 50 Hz single-phase distribution transformer gave the following results:
Question:
Tests on a 10 kVA 11 000/240 V, 50 Hz single-phase distribution transformer gave the following results:
Open-circuit-test 11 000 V, 70 W, 21.8 mA
Short-circuit-test 310 V, 80 W, 0.9 A
In both tests the voltage was applied to the high-voltage winding.
a) Calculate the equivalent circuit parameters referred to the high-voltage winding and draw these on a sketch of the equivalent circuit.
b) Sketch the phasor diagram for the transformer and determine the voltage required to be applied to the primary winding when the transformer supplies rated kVA at 0.8 pf lagging.
c) Calculate the regulation of the transformer when supplying rated kVA at 0.8 pf lagging.
Auditing and Assurance Services A Systematic Approach
ISBN: 978-1259162343
9th edition
Authors: William Messier, Steven Glover, Douglas Prawitt