2. The OCC of a shunt generator running at 850 rpm is given below:Field current (A):0.81.62.43.244.85.6Armature voltage (V):28557582100108115(i) Find the open circuit induced emfs for field resistances of 22N and 332. (ii) What shouldbe the field resistance so that the open circuit induced emf at 850 rpm is 100 V. (iii) Find thecritical speed for the field resistance found in (ii) and (iv) find the critical field resistance at850 rpm.64/114

Answered: Image /qna-images/answer/b5cfd30f-7d68-45c0-a57d-509a31cf3587.jpg

2. The OCC of a shunt generator running at 850 rpm is given below: Field current (A): 0.8 1.6 2.4 3.2 4 4.8 5.6 Armature voltage (V): 28 55 75 82 100 108 115 (i) Find the open circuit induced emfs for field resistances of 220 and 332. (ii) What should be the field resistance so that the open circuit induced emf at 850 rpm is 100 V. (iii) Find the critical speed for the field resistance found in (ii) and (iv) find the critical field resistance at 850 грт. 64/114

2. The OCC of a shunt generator running at 850 rpm is given below: Field current (A): 0.8 1.6 2.4 3.2 4 4.8 5.6 Armature voltage (V): 28 55 75 82 100 108 115 (i) Find the open circuit induced emfs for field resistances of 220 and 332. (ii) What should be the field resistance so that the open circuit induced emf at 850 rpm is 100 V. (iii) Find the critical speed for the field resistance found in (ii) and (iv) find the critical field resistance at 850 грт. 64/114

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 shunt generator supplies a 30kW load at 215V through cables of resistance, R = 110mn. If the field winding resistance, Rf =680 and the armature resistance, Ra =45mn. Determine the following below: The terminal voltage is, The e.m.f. generated in the armature is,
With increasing load current, the output voltage of a separately-excited DC generator falls, which is a property of its load characteristics (decreasing load resistance). As the load current grows, what is the most appropriate solution or action you can take to counteract this voltage drop and keep the output voltage at a consistent level? Note: Please explain in no more than 60 words.
The open-circuit characteristic of a shunt generator when driven at normal speed is as;Field current (A)0.51.01.52.02.53.03.5O.C. volts (V)54107152185210230240The resistance of armature circuit is 0.1 Ω. Due to armature reaction the effective field current is given by the relation Ish (eff.) = Ish − 0.003 Ia. Find the shunt field circuit resistance that will give a terminal voltage of 220 V with normal speed (a) on open circuit (b) at a load current of 100 A. Also find (c) number of series turns for level compounding at 220 V with 100 A armature current; take number of shunts turns per pole as 1200 and (d) No. of series turns for over-compounding giving a terminal voltage of 220 V at no-load and 230 V with 100 A armature current.
The open-circuit characteristic of a shunt generator when driven at normal speed is as;Field current (A)0.51.01.52.02.53.03.5O.C. volts (V)54107152185210230240The resistance of armature circuit is 0.1 Ω. Due to armature reaction the effective field current is given by the relation Ish (eff.) = Ish − 0.003 Ia. Find the shunt field circuit resistance that will give a terminal voltage of 220 V with normal speed (a) on open circuit (b) at a load current of 100 A. Also find (c) number of series turns for level compounding at 220 V with 100 A armature current; take number of shunts turns per pole as 1200 and (d) No. of series turns for over-compounding giving a terminal voltage of 220 V at no-load and 230 V with 100 A armature current.please answer only part C and D
A long shunt compound generator delivers 100 A at 250 V. The armature, shunt field and series field resistances are 0.02 Ohms, 50 Ohms and 0.05 Ohms respectively. If the Break Horse Power (BHP) or the power developed by the shaft torque of the driving engine is 40, determine the stray loss.
(a) A short shunt cumulative compound dc generator supplies 6kW at 235V. The Shunt field resistance, Series field resistance and Armature resistances are 8012, 0.192 and 0.22 respectively. Calculate the induced emf and load resistance.
A long shunt cumulative compound dc generator delivers a load current of 60A at 440V. The shunt field resistance , series field resistance and armature resistance are 80, 0.9 and 0.4 respectively. Calculate the induced emf and load resistance.
In the load characteristics of a separately-excited DC generator, its output voltage decreases with increasing load current (decreasing load resistance). What possible fix or action can you take to offset this decrease in voltage and maintain the output voltage at a constant level as the load current increases?
A 50 kW, 220 V, dc shunt generators has an armature resistance including brushes of 0.026 ohms. If the shunt field resistance is 52 Ω. Find the induced emf at rated load.
Determine the e.m.f. generated of a short-shunt compound generator supplies 100 A at 400 V. If the field resistance, Rf =20 Ω, and the armature resistance, Ra =0.06 Ω. If you know that the volt drop in series winding is 2 V
Q23) A shunt generator supplies a 20KW load at 200V through cables of resistance, R = 100mΩ. If the field winding resistance ,Rf=50Ω and the armature resistance, Ra=40mΩ, i) Estimate terminal voltage across the load. ii) Calculate the emf generated in the armature.
A shunt generator supplies a 20kW load at 200V through cables of resistance, R= 100mΩ. If the field winding resistance, Rf =50Ω and the armature resistance, Ra =40mΩ, determine (a) the terminal voltage, and (b) the e.m.f. generated in the armature