2) A single-phase power system is shown in the figure below. The power source feeds a 100 kVA 14/2.4 kV transformer through a feeder impedance of 40 + 150 2. The transformer's equivalent series impedance referred to its low voltage side 0.12 +0.5 2. The load on the transformer is 90 kW at 0.85 pf lagging and 2300 V. a) Draw the equivalent circuit of the system refereed to the high voltage side and calculate source voltage and voltage regulation of the overall system. b) Find efficiency of the overall power system. /1500 VAR Source 400 www Feeder (transmission line) 0.120 20,5 2 ww Transformer Load Load 90 kW 0.85 PF lagging

2) A single-phase power system is shown in the figure below. The power source feeds a 100 kVA 14/2.4 kV transformer through a feeder impedance of 40 + 150 2. The transformer's equivalent series impedance referred to its low voltage side 0.12 +0.5 2. The load on the transformer is 90 kW at 0.85 pf lagging and 2300 V. a) Draw the equivalent circuit of the system refereed to the high voltage side and calculate source voltage and voltage regulation of the overall system. b) Find efficiency of the overall power system. /1500 VAR Source 400 www Feeder (transmission line) 0.120 20,5 2 ww Transformer Load Load 90 kW 0.85 PF lagging

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.33P: Consider the three single-phase two-winding transformers shown in Figure 3.37. The high-voltage...

See similar textbooks

Similar questions

A single-phase step-down transformer is rated 13MVA,66kV/11.5kV. With the 11.5 kV winding short-circuited, rated current flows when the voltage applied to the primary is 5.5 kV. The power input is read as 100 kW. Determine Req1andXeq1 in ohms referred to the high-voltage winding.
For an ideal transformer, the efficiency is (a) 0 (b) 100 (c) 50
For an ideal 2-winding transformer, an impedance Z2 connected across winding 2 (secondary) is referred to winding 1 (primary) by multiplying Z2 by (a) The turns ratio (N1/N2) (b) The square of the turns ratio (N1/N2)2 (c) The cubed turns ratio (N1/N2)3
For a short-circuit test on a 2-winding transformer, with one winding shorted, can you apply the rated voltage on the other winding? (a) Yes (b) No
All values of a transformer are proportional to its __________________ ___________________.
Consider the three single-phase two-winding transformers shown in Figure 3.37. The high-voltage windings are connected in Y. (a) For the low-voltage side, connect the windings in , place the polarity marks, and label the terminals a, b, and c in accordance with the American standard. (b) Relabel the terminals a, b, and c such that VAN is 90 out of phase with Va for positive sequence.
The symbol shown is a(n) a. iron core transformer. b. auto transformer. c. current transformer. d. air core transformer.
In the circuit in Figure 2, the capacitor connected to the a-b terminals of the transformer anda circuit consisting of resistance is defined as a load circuit. a)Find the average power spent by the load circuit? b) How much of the average power calculated in a) by the resistance in the load circuit and how muchspent by the capacitor? Comment on the results obtained?
In the circuit shown in the figure, a voltage with a peak value of 212.16 V is applied to the input of the secondary transformer with common winding. The ratio between transformer windings is 5: 2. Find the Vrms value on VS2. A 59,98 Vrms B 29,99 Vrms C 42,43 Vrms D 84,86 Vrms E 42,52,99 Vrms
In the circuit in Figure 2, the capacitor connected to the a-b terminals of the transformer anda circuit consisting of resistance is defined as a load circuit. Find the average power spent by the load circuit?
A 4 kVA, 400/200 V single-phase transformer has resistance of 0.02 p.u. and reactance of 0.06 p.u. Its actual resistance and reactance refferd to h.v. side are ?
The rated voltages of a single-phase transformer are 2000 V and 200 V in its primary and secondary respectively. The shunt impedance can be modelled with a resistance of 14000 ohms in parallel with a reactance of 1100 ohm, both refer to primary side. The primary and secondary series impedances are (0.12+j 0.35) ohms and (0.0012+j 0.0035) ohms respectively. A load is connected to the secondary side of transformer, draws 810 KVA with a lagging power factor of 0.85. The load voltage is same as rated voltage, that is 200 V. ▪ Use per unit method for analysis and find the voltage on primary side in pu.