1. The Open Circuit Curve of a 2000 V,900KVA Synchronous Generator is given below. Line voltage(volt) 500 1000 1500 2000 2400 2760 3080 3360 Field current(amp) 1 3 4 5 6 7 8 The armature resistance is 0.1 ohm and its synchronous reactance is 1.3 ohm.The friction and windage losses are 16 kW and core losses are 13 kW.The generator is Y connected.Frequency is 60 Hz.Number of poles is 4. The 3-phase lond is connected as Y. (a)Assume that the generator operates at 80% of the rated load.The load voltage is the rated voltage.Calculate the internal voltage at 0.85 pf leading load.What will be the corresponding field current? (b)Calculate the Voltage Regulation.

1. The Open Circuit Curve of a 2000 V,900KVA Synchronous Generator is given below. Line voltage(volt) 500 1000 1500 2000 2400 2760 3080 3360 Field current(amp) 1 3 4 5 6 7 8 The armature resistance is 0.1 ohm and its synchronous reactance is 1.3 ohm.The friction and windage losses are 16 kW and core losses are 13 kW.The generator is Y connected.Frequency is 60 Hz.Number of poles is 4. The 3-phase lond is connected as Y. (a)Assume that the generator operates at 80% of the rated load.The load voltage is the rated voltage.Calculate the internal voltage at 0.85 pf leading load.What will be the corresponding field current? (b)Calculate the Voltage Regulation.

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

10- 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 series field current is a. 10A b. 9A c. 1A d. 2A
C 4 Pole generator has a lap wound armature with 30 conductor per slot. The flux per pole is 30mWb and the speed of the generator is 960rpm. Find the total number of slots to generate an EMF of 316.8V.
The frequency of rotor current in an induction motor is slip times the frequency of stator current. slip times the frequency of supply, One by slip times the frequency of stator current. One by slip times the frequency of supply
We know there are few conditions for alternator synchronization. How many conditions are there? Write all the conditions.
6
A 6 pole DC lap wound generator has 34 armature conductors with flux per pole is 48 mWb and the e.m.f generated is 55 V, then the speed of the machine is 4.29 rps 0.43 rps 33.70 rps 33.70 rps
A 6 pole DC lap wound generator has 32 armature conductors with flux per pole is 44 mWb and the e.m.f generated is 74 V, then the speed of the machine is O 3.28 rps 0.33 rps 52.56 rps O 52.56 rps arch op
9.09 The flux density distribution in the air-gap of a certain generator is such that it contains a fundamental, a third harmonic, and a fifth harmonic. The flux per pole due to the fundamental distribution is 9 x 10-3 weber, that due to the third harmonic distribution is 0.9 x 10-3 weber, that due to the fifth harmonic distribution is 0.4 x 103 weber. There are four armature slots per phase per pole, the connection are made for three-phase wye. and the coil pitch is 12/15. The frequency is 60 cycles and the generator has 4 poles. (a) Calculate the emf/turn. (b) If there are six turns/coil and two coil sides/slot, calculate the emf per phase. (c) Calculate the emf between line terminals. Ans. 2.32V; 212V; 364V
A 9.9 kV, Y-connected, 3 phase alternator has a synchronous reactance of 8 ohms per phase and negligible resistance. At a certain field current the armature is known to induce 8.2 kV per phase. Calculate the power that can be developed by the alternator at this excitation.
A 2300V, 1000 kVA, 0.8 lagging power factor, two-pole, 60HZ, Wye-connected, synchronous generator has a synchronous reactance of 1.1 ohms and an armature resistance of 0.15 ohms. Its losses due to friction and friction with the air are 24 kW and its core losses are 18 kW. The field circuit has a dc voltage of 200v and a maximum of 10A. The field circuit current is adjustable in the range of 20 to 200 ohms.The magnetization curve of this generator is shown in the figure below.a) How much field current is required for Vt to equal 2300V when the generator is running without load?b) What is the voltage generated intermittently by this machine at nominal conditions?c) How much field current is needed to make the voltage at the terminals Vt=2300V when the generator works in nominal conditions?d) How much power and torque should the prime mover of the generator be able to supply?
A 4 pole generator with wave wound armature has 50 slots each having 22 conductors. The flux per pole is 0.01 Wb. At what speed must the armature rotate to give an induced EMF of 220V is,
6 shunt generators are running in parallel in a curtain generating station. Each generator supplies a load current of 500 A at 220 V. The shunt field current of each generator is 5 A and the armature resistance of each machine is 0.05 ohm. If one generator is suddenly switched off determine the percentage change in terminal voltage, the total load current being kept uncharged