) Identify the type of stability problem illustrated in Figure Q2 and briefly explain this stability problem and its implications on power system operation. Rotor angle (degrees) Machine 2 rotor angle when clearing time > 5 cycles Machine 3 rotor angle when clearing time > 5 cycles Machine 3 rotor angle when clearing time - 5 cycles Machine 2 rotor angle when clearing time - 5 cycles Figure Q2 Time (s) Determine the phase voltages corresponding to the following symmetrical components:

) Identify the type of stability problem illustrated in Figure Q2 and briefly explain this stability problem and its implications on power system operation. Rotor angle (degrees) Machine 2 rotor angle when clearing time > 5 cycles Machine 3 rotor angle when clearing time > 5 cycles Machine 3 rotor angle when clearing time - 5 cycles Machine 2 rotor angle when clearing time - 5 cycles Figure Q2 Time (s) Determine the phase voltages corresponding to the following symmetrical components:

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

the frequency of the induction generator on the rot ratori 9- Explain how does a synchronous generator work. Support your answer with drawing. 10-Draw the synchronous generator phasor diagram forimir tead power factor
A 350 V, 50 Hz, Y-connected, eight poles synchronous generator has the OCC given in tabular form below (Phase Voltage versus the field current). The generator has a per-phase synchronous reactance of 3.2 Q, and an armature resistance of 0.6 Q. The machine supplies a 20 KVA load, at 0.8 PF lagging. How much field current must be supplied to the generator to keep the terminal voltage at 350 V? EA. (V) 65 125 260 290 320 350 380 420 450 470 IF, (A) 0.00 0.5 1.0 2.0 2.25 2.55 2.7 3.0 3.7 4.1 4.25 Select one: O a. If = 2.7 A O b. IF = 2.25 A O c. None O d. Ip = 2.55 A Clear my choice
88
synchronous generator with inertia constant, H, operates in steady state with steady state rotor angle δ0 . The steam turbine delivers rated mechanical power Pm to the generator. Following a three-phase short circuit fault at the generator terminals, the generator’s rotor accelerated at the rate of π/6 rad/s2. The fault lasted t =Square root 2 s. i) The maximum allowed increase in power angle during the fault that would ensure generator stability is π/6 rad. Will the generator retain stability after the fault clearing?ii) Calculate the maximum electrical power that the generator can deliver to the network.
Three identical steam-turbine generators G1, G2, and G3 are operating in parallel. Each generator is: 7.2 KV, 25.4 MVA, 60 Hz, 0.77 PF lagging, 4-poles, Y-connected, with synchronous reactance of 2 Q and an armature resistance of 0.05 Q. Each of generators G1 , and G2 has a characteristic power-frequency slope of 5.8 MW/Hz, and no-load frequency of 62.5 Hz. Generator G3 has a characteristic power-frequency slope of 6.0 MW/Hz. Find the no-load frequency of generator G3 for which all generators supply a load of 42.6 MW, at fsys = 60 Hz. Select one: O a. fevs = 62.95 Hz O b. fsys = 62.26 Hz O c. None O d. fsys = 62.5 Hz
Draw the phasor for the synchronous compensator ateach of the following operating conditions: lagging pf, leadingpf, and normal excitation?
A generator is connected through a transformer to a synchronous motor as shown in the following figure. (All values in this problem are per unit.) Before the fault V,=0.9,1=1 with power factor 0.8 lagging. jX, P + jX ds jX" dm + E. E The reactances are Xd=0.15 , X,=0.1 , X âm=0.35. A symmetric fault occurs at P. Find the per-unit current magnitudes in the fault, the generator and the motor (a) using subtransient voltages. (b) using a Thevenin equivalent.
Q2. a) A 415V, 50Hz, 3-phase induction motor supplies its rated power to a load. The rated speed of the motor is 980 rpm. 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. (i) 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.
Choose the correct option does not have self-starting torque DC Motor EMF due to Mutual inductance Choose... DC Motor Generated EMF DC Generator Back EMF Transformer EMF due to rotating magnetic field Single phase system Three phase induction motor
Three (533 KW, 483, KW, 583 KW) 480 V diesel -driven 60 Hz synchronous generator, A, B and C are in parallel. and taking shares of a 183 KW, 283 KW,333 KW and the speed regulation of the three machines are 2.5% , 2%, and 2.7% respectively. System frequency is 60HZ. If a three phase 400KW resistance load and three phase induction motor draw 533 KVA at .8 pf added to the bus Determine a) The system real power b) The system frequency c) Real power carried by each machine GSR(speed regulation) GSR xf rated A f rated A P
Three identical steam-turbine generators G1, G2, and G3 are operating in parallel. Each generator is: 7.2 KV, 25.4 MVA, 60 Hz, 0.77 PF lagging, 4-poles, Y-connected, with synchronous reactance of 2 Q and an armature resistance of 0.05 Q. Each of generators G¡ , and G2 has a characteristic power-frequency slope of 5.8 MW/Hz, and no-load frequency of 62.5 Hz. Generator G3 has a characteristic power-frequency slope of 6.0 MW/Hz. Find the no-load frequency of generator G3 for which all generators supply a load of 38.5 MW, at fsys = 60 Hz. Select one: O a. fsys = 62.5 Hz O b. fsys = 61.85 Hz O c. None O d. fsys = 61.58 Hz Clear my choice