School of Environment, Resources and Development, (SERD)

ED72.08 : Power Distribution Systems  3(3-0)

Distribution System is an important portion of power systems due to its high investment and its direct effect on customers. This course is intended to give an overview of the characteristics of distribution systems, power quality requirements, and protection measures. The planning and design considerations are also introduced.

Catalog Description:

By the end of the course, the student would be able to:

  • Identify various factors and criteria require for planning of suitable distribution systems
  • Design various types of power supply systems to satisfy customer demands and minimize production loss
  • Design a suitable distribution substations with proper bus-bar and feeder schemes to supply power reliably and economic way to present demand as well as future load growth requirements
  • Analyse and apply various power quality control techniques to improve quality of power supply and minimize productivity loss as well as enhance customer satisfaction
  • Apply deterministic as well as probabilistic approach for distribution power flow analysis and also evaluate the impact of embedded renewable generations on power supply systems
  • Apply various methods for the real power loss and voltage drop reduction in distribution system
  • Apply various over-current protection devices and its coordination techniques to minimize outages and production loss
  • Analyse reliability of distribution systems and suggest various techniques for improvement of it
  • Design an advanced and customized level of power supply system for specific applications by applying various available techniques


Course Outline:
I.      Planning of Distribution Systems
1.      Economic Growth, Electrification
2.      Load Characteristics and Load Fluctuations
3.      Consumer Classification and Sensitive Load - Computer Loads
4.      Impacts of Embedded Renewable Generation on Distribution Planning

II.     Design of Distribution Systems and its Features
1.      Design Criteria for Distribution Systems
2.      Bus-bar Arrangement in Distribution Substation
3.      Arrangement of Distribution Primary Feeders
4.      Unit Substations

III.    Power Quality Fundamentals and Remedial Measures
1.     Definition of Power Quality and its Impacts on Productions
2.     Transients, Interruption, Voltage Fluctuations, Harmonics
3.     Power Supply for Sensitive Loads

IV.    Distribution Power Flow Methods
1.     Deterministic Power Flow Analysis
2.     Probabilistic Power Flow Analysis
3.     Embedded Generation and Distribution Power Flow
4.     Impacts of Embedded Renewable Generation on Distribution Power Flow

V.     Voltage Drop and Line Losses
1.     Voltage Drop Definition and Techniques to Improve Voltage Drop
2.      Line Losses Definition
3.      Calculation of Line Losses
4.      Function of Capacitors, and its Optimal Placement

VI.    Over-current Protection Devices and its Coordination
1.     Fault Classification
2.     Characteristics of Over-current Protection Devices
3.     Coordination of Protection Devices
4.     Effect of Embedded Renewable Generations

VII.   Reliability and Distribution System Automation
1.     Fundamentals of Reliability
2.     Factors Affecting on Reliability
3.     Distribution Automation and its Drivers
4.     Distribution Automation and Reliability

VIII.  Custom Power Devices
1.     Concept of Customized Power Supply System
2.     Classification of Customized Power Supply System
4.      Application of Customized Power Supply System

Laboratory Sessions:



Lecture notes

  1. J. J. Burke: Power Distribution Engineering - Fundamentals and Applications, Marcel Dekker, 1994.
  2. A. S. Pabla: Electric Power Distribution, 5th Edition, TATA McGraw Hill, 2004.
  3. Thomas Allen Short: Electric Power Distribution Equipment and Systems, CRC Press, 2004.
1.      A.J. Pansini: Electrical Distribution Engineering, the Fairmont Press, Inc., 1992.
2.      J.J. Burke: Power Distribution Engineering, Marcel Deker, In, 1994.
3.      R.C. Dugan: Electrical Power Systems Quality, McGraw-Hill Co, 1996.
4.      E. Ladervi, and D.J. Holmes: Electricity Distribution Network Design, 2nd Edition, 1998.
5.      A. Ghosh and G. Ledwich: Power quality enhancement using custom power devices, Kluwer Academic Publishers, 2002.
1.         IET Proceedings on Generation, Transmission and Distribution, IET.
2.         IEEE Transactions on Power Delivery, IEEE.
3.         IEEE Transactions on Power Systems, IEEE.
4.         International Journal of Electrical Power & Energy Systems. Elsevier.
5.         Proceedings of the IEEE, IET.
Lectures and Discussions                      45        hours
Seminars                                                    15        hours
Field Visit                                                     1/2       day
Assignments                                               15        hours
Self-Study                                                   135        hours
Teaching Method:
The Lectures would be held with the support of PPTs. Learning methods include,
  1. Classroom discussions
  2. Assignments
  3. Course Project
  4. Seminars
  5. Field visits
Grading System:
The final grade will be computed from the following constituent parts:
1.      Assignments and class performances (10%)
2.      Mid-semester exam (40%)
3.      Final exam (50%)
Closed book examination is used for mid-semester and final exams.
Note: Class performances means student should be attentive and interactive in each class discussions.

‘A’ grade will be awarded if a student demonstrates advanced knowledge in both the exams and classroom as anticipated in the course learning outcomes above.
 ‘B+’ grade will be awarded if the student could ably demonstrate his/her understanding on the topics discussed and its analysis.
‘B’ grade will be awarded if the student demonstrates on an average his/her understanding on the topics discussed and be able to analyze them.
‘C+’ grade will be awarded if the student demonstrates below average his/her on the topics discussed.
‘C’ grade will be awarded if the student demonstrates low his/her understanding on the topics discussed.
‘D’ grade will be awarded if the student does not meet basic expectations on his/her understanding on the topics discussed.