Two separately excited DC generators are connected in parallel to supply a total load current of 100 A. The two generators have the following parameters: G1: R. = 0.55 N and induced E.M.F=300 V G2: R. = 0.76 N and induced E.M.F=350 V Find Mathematically: (i) The armature current of each generator, and the bus-bar voltage, (ii) The load power and the power sharing by each generator, (iii) If it requires equal copper losses for both generators, what must be done to achieve this? Determine that for the same load current. (iv) The power sharing by each generator for this case.

Two separately excited DC generators are connected in parallel to supply a total load current of 100 A. The two generators have the following parameters: G1: R. = 0.55 N and induced E.M.F=300 V G2: R. = 0.76 N and induced E.M.F=350 V Find Mathematically: (i) The armature current of each generator, and the bus-bar voltage, (ii) The load power and the power sharing by each generator, (iii) If it requires equal copper losses for both generators, what must be done to achieve this? Determine that for the same load current. (iv) The power sharing by each generator for this case.

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 20KW, 440V, short shunt compound dc generator has full load efficiency of 87%. If the resistance of the armature and interpoles is 0.4ohm and that of the series and shunt fields 0.25ohm and 240ohms respectively, calculate the combined bearing friction, windage and core loss of the machine A 10 kW 250 volts self-excited generator, when delivering rated load, has an armature-circuit voltage drop of 5% of the terminal voltage and a shunt field current equal to 5% of the rated load current. The resistance of the armature is 0.02 ohm. Calculate the voltage generated and power output.
A separately excited generator has no-load voltage of 125V. A certain load rated at 1200W, 120V is then connected at the terminal. Calculate the series resistance needed to connect to the armature circuit in order for the load to operate at rated condition if the armature resistance is 0.0692Ω.
Two similar 6,600-V, 3-φ, generators are running in parallel on constant-voltage and frequency bus bars. Each has an equivalent resistance and reactance of 0.05 Ω and 0.5 Ω respectively and supplies one half of a total load of 10,000 kW at a lagging p.f. of 0.8, the two machines being similarly excited. If the excitation of one machine be adjusted until the armature current is 438 A and the steam supply to the turbine remains unchanged, find the armature current, the e.m.f. and the p.f. of the other alternator. [789 A, 7200 V, 0.556]
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,
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.
6/ What are the parameters required for the internal characteristics of the DC Generator? a. Terminal voltage (V) and Field current (If) b. Generated EMF (Eg) and Armature current (Ia) c. Terminal voltage (V) and load current (IL) d. Generated EMF (Eg) and Load Current (IL)
(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.
Two similar 6,600-V, three phase generators are running in parallel on constant-voltage andfrequency bus bars. Each has an equivalent resistance and reactance of 0.05 Ω and0.5 Ω respectively and supplies one half of a total load of 10,000 kW at a laggingp.f. of 0.8, the two machines being similarly excited. If the excitation of onemachine be adjusted until the armature current is 438 A and the steam supply to theturbine remains unchanged, find the armature current, the e.m.f. and the p.f. of theother alternator.
A 110V shunt generator has a full load current of 100A, shunt field resistance of 55 ohms and constant losses of 500W. If full load efficiency is 88%, find the armature resistance. Assuming voltage to be constant at 110V, calculate the efficiency at half load. Find the load current.
What is Equation to find Slip, Output horse power, Torque, Stator current, p.f, Efficiency, From this result and we have Frequency and poles this result from load test of an induction motor
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.
111/ The armature reaction of the DC generator reduces the generated EMF. Select one: True False