Tutorial 4, EE 330: Power Systems
Find the per unit impedances needed for drawing the impedance diagram for the system
shown in the figure, assuming 100 MVA, 132 kV base in the transmission line circuit.
Following are the given data.
Revision of Basic Principles of
Power system is nothing but an inter-connection of a large number of electrical components.
The basic principles of circuits are also applicable in most of the cases in explai
EE330 TUT2 Answers
I a 2
Z L in Equivalent Circuit (ref to primary)
EE330 TUT 1
Q1: (a) A three phase induction motor operates from a 220V bus and drives a mechanical
load .The complex power drawn from the bus is 20 KVA at 0.707 power factor lagging.
Determine the line current it draws in Amperes.
(b) The power factor of
EE330 TUT3 Answers
Q1 (i) 26.24A (ii) 26.240 A, 26.24 60 A (iii) Yes loaded to 5.773 KVA.
Q2: (i) 0.6736.87
66.67MVA, 199.18kV, 20.5kV
/ kM at 50 Hz.
(i) 1.46 r (ii) 1.723 r.
Ver_1: Delta Load
(b) S a =3.407-j*3.407
EE330 TUT 5_Answers
Q2: L 5.958*107 H/m, C 1.916 *10 11 F/m
Q3: (4.24+j7.45) , 13.26934.19o kV, 20.63%
Q4: 130.46.6okV, 9.8%
Q5: For the line in Q4 determine (a) The Equivalent model. (b) The A, B, C, D
parameters (c) The send
EE330 TUT 4
Q1: A single phase transmission line has solid round aluminum conductors having
diameter of 0.412 cm. The conductor spacing is 3m.Determine the inductance in mH/km.
How much inductance is due to internal flux linkage?
What is the value for lin
EE330 TUT 6
Q1: 460MW of power is to be transmitted to a substation located 500 km from the source
of power, with VS =1p.u. VR =0.9 p.u., =5000km, Z C =500 , and = 36.87o.
(a) Determine the nominal voltage level for a lossless line.
(b) Calculate the theo
EE330 TUT 5
Q1: A three phase line is composed of o conductors with outside diameter of 3.28Cm.
The conductors are arranged in a horizontal plane with 12 meters distance between
adjacent conductors. The line is transposed. Calculate the capacitive reactan
EE330 TUT 2
Q1: (a) A three phase system has the following line currents in phasor domain.
I 1000 I 102300 I 101300 .The unit is Amperes. Note there is no
magnitude unbalance; only phase angle unbalance
Determine the representation of the currents i
EE330 TUT 8
Q1: (a) Determine the load flow equations in rectangular form for the 2 bus system.
(b) Derive the equations for the cos 2 and sin 2
Q2: In Q1 if V1 =1,
G =1.0, B =10.5, P=0.8, Q=0.6,find 2 and V2 .
Q3: (a) In Q1 (b), reduce the equat
EE330 TUT 7
Q1: A five node, eight branch network is shown in figure 1.The branch admittances are
shown. The generator voltages and impedances are shown. The arrows show ref
directions for branch currents.
(a) Draw the directed graph of the network.
Power system in earlier days
Fig. 1.2: Power systems in earlier days
Main features of modern power systems
Wide geographical spread.
Large number of interconnections.
Rapid growth in the demand of electricity.
Power system components are
Almost all the electricity produced in the world comes from three phase synchronous
generators, or alternators. The behavior of the synchronous generators and their control
mechanisms are very important in
Tutorial 1, EE 330: Power Systems
For the single-phase circuit shown below, I = 100 o A.
(a) Compute the phasors I1 , I 2 and V .
(b) Draw a phasor diagram showing I , I1 , I 2 and V .
Tutorial 12, EE 330: Power Systems
The system shown in figure is initially on no load with generators operating at their rated
voltage with their emfs in phase. The rating of the generators and the transformers and their
respective percent reac
Tutorial 2, EE 330: Power Systems
A 15 MVA, 13.6 kV, 60 Hz hydro-generator operates at rated speed and rated terminal
voltage. Given the following reactance data, find the real power output of the generator,
neglecting the voltage drop in the
Tutorial 3, EE 330: Power Systems
A 3 phase, 5 kVA, 208 V, 4-pole, 60 Hz, star-connected synchronous machine has negligible
winding resistance and a synchronous reactance of 8 /phase. The machine is operating at
rated terminal voltage.
Tutorial 10, EE 330: Power Systems
A three-bus power system is shown in the figure. Per unit values of the total resistance (R),
total reactance (X), and total line charging susceptance (B) for the lines are given in the table.
Construct the b
Tutorial 7, EE 330: Power Systems
A 3 phase, 50 Hz, synchronous generator supplies a star-connected three-phase inductive load
of 500 kW at a power factor of 0.707 lagging, through a transmission line of length 25 km,
having resistance and ind
EE330A: Tutorial 1
2017 - 18 Semester I
The four loads connected to a generating station have peak demands of
2, 3.5, 1 and 2.5. The maximum installed capacity of station is
sufficient to supply all peak demands at a time. The yearly peak deman
Tutorial 2, EE 330, 2014
A star connected three-phase source is generating both real and reactive power at 132kV
(line to line) and 0.95 power factor. A delta connected load is connected to the source
through a transmission line having per phas
Tutorial 4, EE 330, 2014
A 3 phase, star-connected, cylindrical rotor, 10 MVA, 11kV synchronous generator is
supplying rated power to a unity power factor load. The terminal voltage and real power
input to the machine are kept constant. A purel
Tutorial 3, EE 330, 2014
A 21MVA, 50Hz, 12-pole, 10kV, star connected salient-pole synchronous generator is delivering rated apparent power to a 0.85 lagging power factor load at the rated voltage.
What is the torque angle of the generator? The
orial 1, EE
E 330: Po
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EE 330: Power Systems
Dr. S. Chakrabarti
Brief history of electric power systems
Brief history of Indian power sector
Total installed capacity in India
Power system in earlier days
Modern Power System
Power System Res