8 If we model each winding of a three-phase motor like the circuit shown in Figure P7.68(a) and connect the windings as shown in Figure P7.68(b), we have the three-phase circuit shown in Figure P7.68 (c). The motor can be constructed so that R1 =R2 = R3 and L1 = L2 = L3, as is the usual case. If we connect the motor as shown in Figure P7.68(c), find the currents ÎR, İw, İg, and În, assuming that the resistances are 40 2 each and each inductance is 5 mH. The frequency of each of the sources is 60 Hz. R1 R3 R2 1st winding 2nd winding 3rd winding L3 (a) R2 L2 4162-30° L1 eéé-ww 4162 210° 416290° ww ll ll ০ ww

8 If we model each winding of a three-phase motor like the circuit shown in Figure P7.68(a) and connect the windings as shown in Figure P7.68(b), we have the three-phase circuit shown in Figure P7.68 (c). The motor can be constructed so that R1 =R2 = R3 and L1 = L2 = L3, as is the usual case. If we connect the motor as shown in Figure P7.68(c), find the currents ÎR, İw, İg, and În, assuming that the resistances are 40 2 each and each inductance is 5 mH. The frequency of each of the sources is 60 Hz. R1 R3 R2 1st winding 2nd winding 3rd winding L3 (a) R2 L2 4162-30° L1 eéé-ww 4162 210° 416290° ww ll ll ০ ww

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 3.33MCQ: The direct electrical connection of the windings allows transient over voltages to pass through the...

See similar textbooks

Similar questions

Describe the concept of power system harmonics and their impact on the quality of electrical supply.
The direct electrical connection of the windings allows transient over voltages to pass through the auto transfonner more easily, and that is an important disadvantage of the autotransformer. (a) True (b) False
The amplitude of the sinusoidal symmetrical ac component of the three-phase short-circuit current of an unloaded synchronous machine decreases from a high initial value to a lower steady-state value, going periods through the stages of __________ and ________ periods.
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…
Describe the On-load and No-load in transformers
L-type equivalent circuit and parameters for a continuous sinusoidal phase of a 5.5 kW, 1450 rpm, line voltage 220 V and frequency 50 Hz star-connected 3-phase ASM, ignoring core (iron) losses given as follows: R1=0.21 Ohm, R2=0.18 Ohm, X1=X2=0.66 Ohm and Xm=9.9 Ohm How many times the rated current will the inrush current be when the ASM is started directly?
please explain the operating principle of single phase 2S-2P PMSM based on 3D design illustration.
1- Derive expression for the output rms voltage for single phase ac voltage controller with resistive load
Discuss the concept of load shedding in power systems. What are the reasons for load shedding, and how can it be mitigated?
in distribution transformers; What is 30 degrees phase shift in delta-star connection? What are the disadvantages? (can you explain with drawing?)
List and describe three (3) losses that occur in power transformers.
Combination circuit what is PT? RT? IT? Voltage Across each load?