I need the answer as soon as possible 1=CloseQ: - An Elevator has the following readings as shown in Fig.0=Open400 V, 50 Hz,4 Pole1. Rotor current/phase at starting for case below:S2$3$4$551$151112. Rotor current/ phase at starting for case below:60 VS1S2S3S4S5LM22 - 0.6+J4S211113. Full load current at slip 4 per cent.5S44. Rotor power factor at full load.SraTR1SR1PR15. Rotor torque at full load.

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1=Close Q: - An Elevator has the following readings as shown in Fig. 0=Open 400 V, 50 Hz,4 Pole 1. Rotor current/phase at starting for case below: SI S2 $3 $4 $5 51 51 1. 60 V 2. Rotor current/phase at starting for case below: S1 S2 S3 S4 $5 LM 72 – 0.6+J4 S2 52 1 1 1 1 3. Full load current at slip 4 per cent. 55 4. Rotor power factor at full load. Sra TR1 SR1 PR1 5. Rotor torque at full load.

1=Close Q: - An Elevator has the following readings as shown in Fig. 0=Open 400 V, 50 Hz,4 Pole 1. Rotor current/phase at starting for case below: SI S2 $3 $4 $5 51 51 1. 60 V 2. Rotor current/phase at starting for case below: S1 S2 S3 S4 $5 LM 72 – 0.6+J4 S2 52 1 1 1 1 3. Full load current at slip 4 per cent. 55 4. Rotor power factor at full load. Sra TR1 SR1 PR1 5. Rotor torque at full load.

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

Chapter6: Power Flows

Section: Chapter Questions

Problem 6.45P

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A generator rated 100MVA, 20KV has X"=X2- 20% and X0-5%. Its neutral is grounded through a reactor of 0.32 ohms. The generator is operating at rated voltage without load and is disconnected from the system when a fault occurs at its terminals. Find the subtransient current in the generator and the line-to-line voltages for subtransient conditions when a) single line-to-ground; b) line-to- line fault occurs at the generator terminals with the generator operating unloaded at rated voltage.
b) Two synchronous generators, G2 and G2, are connected parallelly supplying a load. Generator G1 has a no-load frequency of 50.5 Hz and a slope of 300 MW/Hz. Generator G2 has a no-load frequency of 50.2 Hz and a slope of 500 MW/Hz. The load consumes 250 MW real power. (1) At what frequency does this system operate, and how much power is supplied by each of the two generators? (ii) An additional 100 MW load is added to this power system. What is the new system frequency, and how much power do G1 and G2 supply? (iii) The governor set point of G2 is changed to control system frequency back to 50 Hz. Determine the G2 governor set point.
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An electromagnet has a movable iron part and dimensions of magnetic circuit with uniform cross section as shown in figure. The core is made of ferromagnetic material with relative permeability of 3000: a) b) c) Calculate the magnetic reluctance of the circuit and the inductance of the main winding. Determine the air-gap flux, the flux density and the field intensity of the core and gap. Because of a fault in the power supply, the exciting current is increased to 8 A causing the mobile element of the iron core to move to a zero gap position as a result of the excessive electromagnetic force action. If this movement occurs in 0.01 s, find the transient voltage induced in the test coil having two turns. 0.5 mm air-gap 2 cm 2 A 3 cm 2 cm 60 turns 18 cm test coil 24 cm 0.5 mm air-gap
In a given system of base power of 250 MW, and bus 3 is taken as reference. The per-unit reactances are X12 = 0.2 p.u., X13 = X23 = 0. 1 p.u. The power flow in the system is given as: PF12 = 50 MW, PF13 = 150 MW, PF23 = 50 MW. Based on readings from 2 meters (not including M12 meter), M13 = 145 MW (not calibrated), and M23 = 50 MW (well calibrated), deduce the flow on line 1-2. Select one: O a. PF12 = - 47.5 MW. O b. None of these O c. PF12 = 67.5 MW. O d. PF12 = 47.5 MW. O e. PF12 =- 57.5 MW. O f. PF12 = 57 MW.
Example 2: The stator of a 30 ,8-poles machine has 96 stator slots and short-pitched by 9/12. The airgap flux density shows that third and fifth harmonics are present and are of amplitude 30 and 15 percent of the fundamental. Determine the ratio of the line-to-line voltage and line- natural voltage.
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