Q.L.A 3 phase 6pole induction generator has rating of 800 KW. The stator is connected to 60 Hz line and rotor winding is connected to variable frequency converter that produces a frequency of 24 Hz from 60 Hz supply. The machine is operating at Sub synchronous speed and the wind turbine de velops 500hp .The wind turbine is connected to the rotor by way of speed racing gearbox. Following information is also given I. Gearbox and other friction losses Pf-11KW 2. ROTOR CU losses Pcu(rotor)=3KW 3. Status u losses Pcu(stator)=12KW 4. Converter losses p converter-2KW 5. Stator core losses Pi=7KW Find (i) sub synchronous speed (ii) Pd developed mechanical power (iii) Pg electromagnetic power transfer from rotor to stator (iv) Tm mechanical torque at the input to rotor (v) Pe electric power absorbed by the converter from 60 Hz supply (vi) PI electric power delivered by stator to 60HZ supply line (vii) Pout and efficiency of the machine

Q.L.A 3 phase 6pole induction generator has rating of 800 KW. The stator is connected to 60 Hz line and rotor winding is connected to variable frequency converter that produces a frequency of 24 Hz from 60 Hz supply. The machine is operating at Sub synchronous speed and the wind turbine de velops 500hp .The wind turbine is connected to the rotor by way of speed racing gearbox. Following information is also given I. Gearbox and other friction losses Pf-11KW 2. ROTOR CU losses Pcu(rotor)=3KW 3. Status u losses Pcu(stator)=12KW 4. Converter losses p converter-2KW 5. Stator core losses Pi=7KW Find (i) sub synchronous speed (ii) Pd developed mechanical power (iii) Pg electromagnetic power transfer from rotor to stator (iv) Tm mechanical torque at the input to rotor (v) Pe electric power absorbed by the converter from 60 Hz supply (vi) PI electric power delivered by stator to 60HZ supply line (vii) Pout and efficiency of the machine

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...

See similar textbooks

Similar questions

A 3-phase, 60 Hz, six pole, 220-volt wound rotor induction motor has a stator that is connected in Delta and the rotor that is connected in Wye. The rotor has haft as many turns as that stator. the RR is equal to 0.1- ohm and XBR is equal to 0.5-ohm (a) calculate also the starting torque developed by the motor (b) For over all operation of this induction motor, calculate the efficiency based on the gathered data.
An induction motor of 30 HP, 220 V, 450% of the rated current with therated voltage and delivers during the starting period, with 130 % of the normal torque. The full load efficiency and full load power factor of the motor is 80 and 70 percent, respectively. If an autotransformer is used as a starting unit and the starting torque of the load is only 50 % of the rated torque of the motor, Determine the starting voltage and the starting current of the line.
A 250V, 150 kW, 850 rpm, DC shunt generator has an armature resistance of 15 mΩ and a total field-circuit resistance of 25 W. The generator is driven at rated speed and supplying rated load at rated terminal voltage with 92.5% efficiency. Complete the power flow diagram below by entering the unknown values in the boxes provided. Express your answers in kW to three decimal places.
A four-pole, three-phase induction motor drives a turbine load. At a certain operatingpoint the machine has 4 percent slip and 87 percent efficiency. The motor drives aturbine with torque–speed characteristic given by TL = 20 + 0.006ω2,where TL is theload torque at the shaft. Determine:(1) the torque at the motor-turbine shaft.(2) the total power delivered to the turbine.(3) the total power consumed by the motor.
A gas turbine, 2-pole, 3? synchronous generator rated at 200 MW is connected to the grid (presumed to be an infinite bus). The electrical operating frequency of the grid is 60 Hz, and the slope of the frequency-power curve for the generator is 15 MW/Hz. a. If the no-load setpoint for the generator is set to 63.5 Hz, how much active power will the generator provide to the grid? b. Neglecting system losses, what is the torque provided by the gas turbine? c. What would happen if the no-load setpoint for the generator is set to 59 Hz?
A four-pole, three-phase induction motor drives aturbine load. At a certain operating point the machinehas 4 percent slip and 87 percent efficiency. The motordrives a turbine with torque–speed characteristic givenby TL = 20 + 0.006ω2. Determine the torque at themotor-turbine shaft and the total power delivered tothe turbine. What is the total power consumed by themotor?
A single-phase induction motor has an auxiliary winding in which the diameters of the wires used are larger than the main winding, and the windings of the winding (similar to the main winding) are such that if the arm goes to the inner floor of the stator groove The return arm is located on the outer floor of the stator.A) Explain with reason why this engine is suitable for start-up?B) Explain with reason Is it necessary to remove the auxiliary winding from the circuit at speeds higher than 0.75 nominal value? What are the advantages or disadvantages of not leaving?
The full load slip of a 4-pole, 60Hz, 440V (line-to-line) three phase induction motor is 0.05. (i). What is the speed of the rotating stating? What is the frequency (in Hz) of the rotor current? (ii). When the output power of the motor is 90 hp at a speed of 1732 rmp, rotational losses (which include frictional and core losses) are 10,100W, while copper losses for both the rotor and stator total 3700W. Determine the motor efficiency and line current, assuming the motor has a 0.8pf lagging under the conditions.
17. A single-phase, 120 V, 60 Hz, four-pole, split-phase induction motor gave the following blockedrotor test data:VIP Main winding 32 4 80Auxiliary winding 40 4 128a) Determine the standstill impedances of the main and auxiliary windings.b) Determine the values of the resistances to be added in series with the auxiliary winding to obtain maximum starting torque.c) Compare the starting torques and starting currents with and without the added resistance in the auxiliary winding circuit if the motor is connected to a 120 V, 60 Hz supply
The no-load speed of an induction motor is 1914 rpm, the specification shows that it is operated 3-phase, 60 hertz, 1758 rpm and supplied by 425 V. what is the percent speed regulation?
A three-phase 60 Hz induction motor connected to a three-phase bus at rated voltage isoperating at a low slip condition (i.e s < 20%) resulting in a steady state speed of 1090 rpm.(a) How many poles does the motor have?(b) What is the percentage slip at the operating speed?(c) What is the corresponding frequency, (fr) of the currents and voltages induced in therotor winding?
A 3-phase induction motor, 440-V, 50-Hz, 6-pole, delta-connected has the following equivalent-circuit parameters at normal frequency:R1.2 ohm, R'2=0.18 ohm, X1= x'2=0.58 ohm, all per phase values. The machine is subjected in service to an occasional fall of 40% in both voltage and frequency. What total mechanical load torque is it safe to drive so that the machine just does not stall under these conditions? When operating at normal voltage and frequency, calculate the speed when delivering this torque and the power developed. Calculate also the speed at which maximum torque occurs. If V and f were both halved, what would be the increase in starting torque from the normal direct-on-line start at rated voltage and frequency? If now the machine is run up to speed from a variable-voltage, variable-frequency supply, calculate the required terminal voltage and frequency to give the 'safe' torque calculated above: (i) at starting, (ii) at 500 rev/min. Repeat (d) for the machine to develop a…