A 690 KVA, 4200-V, 60 Hz, 0.9 PF lagging, Delta-connected, 8- pole synchronous generator has an armature resistance of 0 Q. The OCC and SCC characteristics are given below in a tabular form. Find the generator's synchronous reactance at rated armature current. IF A) 0.25 0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25 2.5 2.75 3.0 VT (V) 400 1200 | 1850 2450 2950 3500 3800 4200 4400 4550 4650 4750 4820 lA (A) 20 45 70 95 125 150 175 200 230 255 280 310 340 Select one: O a. Xs = 8.6 Ohms O b. X, = 14.9 Ohms c. None d. Xs = 25.8 Ohms e. X, = j25.8 Ohms

A 690 KVA, 4200-V, 60 Hz, 0.9 PF lagging, Delta-connected, 8- pole synchronous generator has an armature resistance of 0 Q. The OCC and SCC characteristics are given below in a tabular form. Find the generator's synchronous reactance at rated armature current. IF A) 0.25 0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25 2.5 2.75 3.0 VT (V) 400 1200 | 1850 2450 2950 3500 3800 4200 4400 4550 4650 4750 4820 lA (A) 20 45 70 95 125 150 175 200 230 255 280 310 340 Select one: O a. Xs = 8.6 Ohms O b. X, = 14.9 Ohms c. None d. Xs = 25.8 Ohms e. X, = j25.8 Ohms

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 50-MVA, 30-kV, three-phase synchronous generator has a synchronous reactance of 8 Ohms/phase and negligible armature resistance. The generator is delivering 50 MVA at 0.8 pf leading to an infinite bus at the rated voltage. Determine the excitation per phase E and the power angle &. Select one: O a. E = 22.78 KV and 8= 15.67 deg. O b. E = 14.115 KV and 8= 25.85 deg. O c. None of these O d. E = 13.96KV and 8= 29.74 deg. O e. E = 27.47KV and 8= 22.84 deg. Impedances are marked in perunit on a 100MVA, 100 KV base. The load at bus 2 is S2= 16MW - 132 MVAR, and the load at EN ? 1:4 4/1- TOSHIBA
The terminal voltage of a 150 kW series generator is 600 V at rated load. The armature resistance is 0.06 ohms and the series field resistance is 0.04 ohms. Find generated emf.
Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous generator is rated 150 MW, 0.85 lagging power factor, 12.6 kV, 60 Hz, and 1800 rpm. Each winding has an armature resistance of 0.05Q and a synchronous reactance of 0.6Q. Draw the phasor diagram with values, show torque angle and determine the induced voltage for the condition of rated load.
2.2 A three-phase synchronous generator has a reactance of 1.5 p.. and negligible resistance. It supplies a rated current of 1.0 p.. at 1.0 p.u. terminal voltage to a lagging load of 0.9 power factor. Determine the rated excitation voltage in p.u. and the internal load angle. Construct the performance chart of the generator in 2.1 (above) assuming its rating is 450 MVA.
The armature of a 6-pole separately excited dc generator is triplex wave wound with 534 conductors. This machine delivers power to the load at 200V while being driven at 900rpm. At this load, the armature circuit dissipates 640W. If the flux of this generator is 180-mWb, determine the kW rating of the load served. Assume a total brush drop of 2V.
7 A three-phase, 60-cycle, 32-pole synchronous generator has a sinusoidally distributed air-gap flux of 0.025 weber/pole. The armature core has 324 slots. The armature winding is Y-connected. There are two coil sides per slot and two turns per coil. The coil pitch is 9 slots. Find the generated voltage between the line terminals. Ans. 2,445 V
A 250-MW, 60-Hz turbine generator set has a speed regulation of 5 percent based on its own rating. The generator frequency decreases from 60 Hz to a steady state value of 59.7Hz. Determine the increase in the turbine power output.
A seperately excited DC generator has a no load voltage of 127 V, Ra= 0.02 ohm and Rsh=15 ohm. Find the armature current when the generator terminal voltage is 120 V on load.
A separately-excited generator develops a no-load e.m.f. of 150V at an armature speed of 20 rev/s and a flux per pole of 0.10Wb. Determine the generated e.m.f. when (a) the speed increases to 25 rev/s and the pole flux remains unchanged, (b) the speed remains at 20 rev/s and the pole flux is decreased to 0.08Wb, and (c) the speed increases to 24 rev/s and the pole flux is decreased to 0.07Wb.
A long shunt compound generator delivers a current of 10A at 200V and has a series field resistance and shunt field resistance of 1 ohm and 200 ohms respectively. Then line current is a. 2A b. 1A c. 9A d. 10A
. When a self-excited compound DC generator supplies load, the terminal voltage is not the same as the generated emE Why? a) voltage drop across the armature resistance will reduce the voltage available at the load terminals b) where there is a series field, voltage drop across the series field resistance will reduce the voltage available at the load terminals c) both "a" and "b" d) neither "a" nor "b"
A short shunt compound generator has an armature; series field and shunt field resistances of 0.031Ω, 0.04Ω and 100Ω respectively. At rated load condition, the terminal voltage is 400V while the armature is developing an emf of 409V. Find the kW delivered to the load at rated condition.