Output at 0.8 p.1. Example 33.3. A 3-phase, 6,600/415-V, 2,000-kVA transformer has a per unit resistance of 0.02 and a per unit leakage reactance of 0.1. Calculate the Cu loss and regulation at full-load 0.8 p.f. Univ. 1987) lag. (Electrical Machines-I, Bombay

Output at 0.8 p.1. Example 33.3. A 3-phase, 6,600/415-V, 2,000-kVA transformer has a per unit resistance of 0.02 and a per unit leakage reactance of 0.1. Calculate the Cu loss and regulation at full-load 0.8 p.f. Univ. 1987) lag. (Electrical Machines-I, Bombay

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Q2/3-phase.E.W.C. R using center tap transformer supplies highly inductive load, find: 1. The average load voltage with and without FWD and discusses these cases. 2-lf firing angle equal to 45°, the supply voltage is240v, transformer ratio is (2/1). Calculate the DC current& voltage of this case. 3- Draw all waveforms diagram. 4- what are the difference between the type of connection (Delta or Star).
A 11000/230 V, 150-kVA, 1-phase, 50-Hz transformer has core loss of 1.4 kWand full load copper loss of 1.6 kW. Determine (a) the kVA load for max. efficiency and(b) the value of max. efficiency at unity power factor
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1. Find the all-day efficiency of a transformer having maximum efficiency of 96% at 30-kVA load at UPF. If during the day the transformer is loaded as follows: 12 hours.... 6 hours... .5 kW at 0.6 p.f. lagging ..24 kW at 0.8 p.f. lagging 6 hours..... ..at no-load.
8- A transformer, when tested on full-load, is found to have Cu loss 1.8% and reactance drop 3.8%. Calculate its full-load regulation (i) at unity p.f. (ii) 0.8 p.f. lagging (iii) 0.8 p.f. leading.
Construct the circuit in Figure 1 in the Circuit JS simulator. Note that the voltage source is given in RMS. Within Circuit JS while defining the max voltage of the voltage source include “rms” after the number to tell Circuit JS that this is a rms value. Also note that there are additional parameters when instantiating a transformer in Circuit JS. Leave these at the default values. Additionally, transformers may have problems simulating in Circuit JS. Answer the following: 1. From the simulation results, determine the power dissipated in R2 and compare to the expected value from the previous section.2. Change the transformer ratio (“Ratio” as a fraction when you “Edit…” the transformer component) to the value calculated in the previous section to provide maximum power transfer in R2. Note: In Circuit JS, Transformer Ratio = Primary/Secondary.3. Rerun the simulation, calculate the power dissipated in R2 and compare to the expected value from the previous section.4. Change the…
QUESTIONS: 1. A 10 kVA, single-phase, 2400-V:120-V, 60 Hz transformer has an equivalent impedance referred to LV side of 0.01 + j0.09 Q. This transformer has a core loss of 100 W at rated voltage. When rated current is applied to the 2400-V winding, the exciting current in that winding is found to be 0.2 A. a. Find the full-load regulation of this transformer at a power factor of 0.8 lagging. b. Find the efficiency of this transformer at full load, 0.8 power factor lagging. c. Ifstandard open-circuit and tests were performed on this transformer, what would be the measured values of these tests? 2. The following data were obtained on a 2.5 MVA, 50-Hz, 19.1-kV:3.81-kV single-phase transformer tested at 50 Hz: Voltage (V) Current (A) Power (kW) LV winding with HV terminals open-circuited: 3810 9.86 8.14 HV winding with LV terminals short-circuited: 920 141 10.3 a. Calculate the cantilever equivalent-circuit parameters as referred to the transformer high-voltage winding. b. Calculate the…
The label values of the single-phase transformer whose electrical equivalent circuit is given below are 20 kVA, 15400V / 240V, 50 Hz. This transformer Calculate what is required below. a. What is the value of the active power measured in the short circuit test? b. What is the value of the active power measured in the idle test? c. Voltage regulation was found to be 0.1% at 0.8 back power factor. Accordingly, using any method you want Find out how many kVA the transformer draws from the network (primary apparent power).
Vr 3. For a 1.2 accuracy class potential transformer used at a lagging phase angle y of 10', the RCF value is A. 0.991. B. 0.988. C. 0.977. D. 0.999. primary connection scheme that must be used with
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a) Express the general formula for a transformer’s energy efficiency when in on-loadoperation, and briefly explain the losses included in the expression.
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