Download EE 4003- Power Systems II - IESL e

EE4003 Power Systems II
Subject Code
EE4003
Credits
4.0
Subject
Title
Total
Hours
Power systems II
Lectures
55 hrs
Prerequisites
GPA
10 hrs
GPA/NGPA
Lab/Assign.
Aim: Familiar with different methods of power system analysis for its operation and planning
Learning outcomes
The student will be able to:
1. Perform short circuit calculations in electrical power systems
1.1. Calculate current and voltage at different locations of the power system under three-phase short
circuit condition
1.2. Use symmetrical components to represent unbalanced system of voltage and current in three
balanced systems of voltage and current
1.3. Sketch sequence networks elements of power system
1.4. Calculate voltage and current in electrical system under asymmetrical short circuit conditions
2. Demonstrate the knowledge of neutral earthing in electrical equipment and systems
1.1 Explain need of neutral earthing of electrical equipment
1.2 Describe arcing ground of ungrounded systems
1.3 Explain methods of earthing in sub-stations
3. Perform load flow calculations in electrical power systems
3.1. Form bus-admittance matrix
3.2. Apply Gauss – Zeidel and Newton-Raphson methods to calculate voltages at buses simple power
system
3.3. Sketch power flow diagram
3.4. Familiarize with software packages to perform power flow calculation in macro systems
4. Demonstrate knowledge in methods of power system protection
4.1. Explain need of protection of electrical power system
4.2. Sketch the zones of protection
4.3. Describe operating principles of different types of relay
4.4. Select suitable current and voltage transformer ratio for relay locations
4.5. Select pick-up and time leaver settings for over current protection in distribution systems
4.6. Determine settings of distance relay for transmission lines
4.7. Explain the use of differential relay for the protection of alternators, transformers and bus bars
5. Perform optimum power dispatch between the units of thermal power plant
5.1 Explain the fuel cost characteristic of thermal power plant
5.2 Explain criteria for economic power dispatch between the units
5.3 Calculate economic dispatch of power between the units of thermal power plant
5.4 Describe the effect of power loss in optimum power dispatch between the plants
6. Asses the stability of power system
6.1. Describe steady-state, dynamic and transient stability and its importance in the operation of
electrical power system
6.2. Explain the criteria for steady-state stability
1
6.3.
6.4.
6.5.
6.6.
6.7.
Write swing equation for single machine system
Derive power angle equations for pre-fault, during the fault and post fault situations
Explain use of equal area criteria for transient stability assessment
Calculate critical clearing angle, critical clearing time for single machine system
Describe methods of improving stability limits
Syllabus
1. Fault analysis [12 hrs]
Types of faults, Symmetrical fault [04]
Symmetrical components, positive, negative and zero sequence networks [04]
Asymmetrical faults- Single line to ground, double line, double line to ground
Fault level [04]
2. Grounding [04]
Effect of ungrounded systems, Arcing ground, step and touch potential, Peterson coil, Zig-Zag
transformer, Grounding arrangement of substations
3. Load flow analysis [9 hrs]
Bus types, bus admittance matrix, Gauss-Zeidel method, Newton Raphson method, modifications of
Newton Raphson method, convergence, Power flow calculation, Use of software
4. Power System Protection [16 hrs]
Zones of protections, electromagnetic relays, static relays, current and voltage transformers, time
current characteristic of relays, directional and non- directional relays, primary and back-up protection,
pick-up and time leaver setting, over current protection, impedance, mho relay, zone setting of distance
relay. Differential relay
5. Power system Economics [4 hrs]
Incremental fuel cost, Criteria for optimum power dispatch between units, Loss coefficient
6. Power system Stability [10 hrs]
Swing equation, Inertial constant, H-constant, Power angle curves, Equal area criteria, critical clearing
time, loss of synchronism, step by step method
Assessment
5 laboratory assignments, each of 2hr duration - 30 %
End of stage written examination of 3hr duration - 70 %
Recommended Texts



John J. Grainger, William D. Stevenson, Power System Analysis, McGraw-Hill, ISBN : 07-061293-5
J. Lewis Blackburn, Thomas J. Domin, Protective Relaying Principles and Applications, Third Edition,
CTC press, ISBN: 10-1-57744-716-5
Nasar S.A. Electric Power Systems, McGraw Hill, ISBN:0-07-045917-7
2