A 90-MVA 69.3-KV, three-phase synchronous generator has a synchronous reactance of 11 Ohms/phase and negligible armature resistance. The generator is delivering power to thebus bar at the rated voltage with its field current adjusted for a generated emf (excitation voltage) of 45 kv per phase and a power angle 8 = 13 degree.Thus, the delivered power isthe generator armature current isand the power factor is110.458 MW36.819 MW491 031 MWNone of these191.319 MW EHide bNG360 MidtermA 90-MVA 69.3-kv, three-phase synchronous generator has a synchronous reactance of 11 Ohms/phase and negligible armature resistance. The generator is delivering power to thebus bar at the rated voltage with its field current adjusted for a generated emf (excitation voltage) of 45 kV per phase and a power angle 8 = 13 degree.Thus, the delivered power isthe generator armature current isand the power factor is0.984 < 68.3 (KA)0.984 <-20.757° (KA)2.49- 68.3" (KA)2.49 <-20.757 (KA)None of these

In this question we need to find a power delivered by genrator, armature current and power factor

A 90-MVA 69.3-KV, three-phase synchronous generator has a synchronous reactance of 11 Ohms/phase and negligible armature resistance. The generator is delivering power to the bus bar at the rated voltage with its field current adjusted for a generated emf (excitation voltage) of 45 kv per phase and a power angle 8 = 13 degree. Thus, the delivered power is the generator armature current is and the power factor is 110.458 MW 36.819 MW 491.031 MW None of these 191.319 MW

A 90-MVA 69.3-KV, three-phase synchronous generator has a synchronous reactance of 11 Ohms/phase and negligible armature resistance. The generator is delivering power to the bus bar at the rated voltage with its field current adjusted for a generated emf (excitation voltage) of 45 kv per phase and a power angle 8 = 13 degree. Thus, the delivered power is the generator armature current is and the power factor is 110.458 MW 36.819 MW 491.031 MW None of these 191.319 MW

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

Chapter11: Transient Stability

Section: Chapter Questions

Problem 11.3P

See similar textbooks

Similar questions

A 60 MVA, 69.3kV, three-phase synchronous generator has a synchronous reactance of 15 ohms/phase and negligible armature resistance. The generator is delivering rated power at 0.8 power factor lagging at the rated terminal voltage to an infinite bus bar. What is the maximum three-phase power that can be generator can deliver before losing its synchronism?
a) 3-phase star-connected synchronous generator supplies a current of 10A having phase angle of 20° lagging 400V (phase voltage). Given the direct and quadrature axis reactances as 10ohms and 6.5ohms respectively and neglecting armature resistance, Find: 1. The load angle 2 The direct and quadrature components of armature currents 3. Voltage regulation
A 3 phase 4MVA, 12 kV star connected synchronous generator has Zs= 0.8+J30 ohm. Using circle diagram only, find: 1. The output power developed at unity power factor with excitation equal to 1.25 of rated voltage. 2. The load angle and power factor if the generator supplies (1500 KW) at rated voltage and excitation lequal to (1.2) of rated voltage. 3. Repeat part (2) when .armature resistance is neglected
A three-phase Y-connected synchronous generator has rated values of 90 MVA, 15 kV, 0.6 reverse power factor, 50-Hz. Synchronous reactance 1.6 ohmsand armature resistance is neglected. According to thisa) Find the induced voltage (EA) and armature current (LA). b) Find the voltage regulation.c) If this generator was operated at 60 Hz with the same armature and field losses as at 50 Hz; What would be the voltage, apparent power and reactance of the generator
A three-phase, 12-kV, 60 Hz, 6 pole wye connected synchronous generator has synchronous reactance of 15 Ω per phase and negligible armature resistance. For a given field current, the open circuit voltage is 13 kV. Determine the following:(A) Terminal Voltage b) Excitation voltage EA at maximum powerc) The maximum power developed by the generator
A 3 phase, star connected synchronous generator supplies current of 10A having phase angle of 20º lagging at 400V. Find the load angle and the components of armature current Id and Iq if Xd = 10 ohm and Xq = 6.5 ohm Assume armature resistances to be negligible
Explain the construction working principle and derivation for the emf induced in a DC generator. Draw the schematic diagram also .
A shunt generator supplies a 31kW load at 230V through cables of resistance, R = 122mΩ. If the field winding resistance, Rf =50Ω and the armature resistance, Ra =51mΩ. Determine the following below: The terminal voltage is, Answer and unit for part 1 The e.m.f. generated in the armature is,
A 70-MVA, 69.3-kV, three-phase round-rotor synchronous generator has a synchronous reactance of 14 ohm per phase and negligible armature resistance. 1) The generator is delivering rated power at 0.87 power factor lagging at the rated terminal voltage to an infinite bus bar (Fig. 1). Determine the magnitude of the generated emf per phase and the power angle δ. 2) The generator is delivering 53.5 MW to the bus bar at the rated voltage with its field current adjusted for a generated emf of 46 kV per phase. Determine the armature current and the power factor. Is the power factor is lagging or leading? 3) Given that the generator is operating at the excitation voltage of Part (1), determine the maximum steady-state power which the machine can deliver without losing synchronism. Find the armature current corresponding to this maximum power.
A three-phase, Y-connected, 220 V, 5 kVA, salient-pole synchronous generator is employed to supply power to a load with unitary fp. By means of a slip test, the direct-axis synchronous reactance is determined to be 12 Ω and the quadrature-axis synchronous reactance, 7 Ω. Consider that the rated current is delivered to the load at the rated voltage and that the armature resistance is negligible. (a) Calculate the corresponding value of the excitation voltage. (b) What is the value of the internal phase shift angle? (c) What is the value of the power angle?
If the armature resistance of a 3-phase, 318.75 kVA, 2300-V synchronous generator is 0.35 ohms per phase, the synchronous reactance is It is 1.2 ohms. Calculate the excitation voltage and voltage regulation for the following load cases: a) Full load, back power factor of 0.8 and rated voltage. b) Full load, forward power factor of 0.6 and rated voltage.
A three phase, 50 Hz, 4800V, 6 pole Y-connected synchronous generator connected to an infinite bus (constant voltage at 4800V) and has synchronous reactance of 20Ω per phase and negligible armature resistance. The generator is delivering 1 MW at a power angle of 30 degrees.. Calculate the following:1. Output torque of the generator2. Excitation voltage Ea3. Armature current4. Power factor5. Reactive power delivered