## TRANSMISSION AND DISTRIBUTION SYSTEMS (CCE)

 SHE Level 3 SCQF Credit Points 20.00 ECTS Credit Points 10.00 Module Code M3H624678 Module Leader Martin MacDonald School School of Computing, Engineering and Built Environment Subject SCEBE - School Office Trimesters A (September start) B (January start)

### Pre-Requisite Knowledge

Utilization of Electrical Power, Electrical Machines

### Summary of Content

This module examines electrical transmission and electrical distribution systems. An understanding of system components and their application will be developed. Transmission system models and analysis techniques (including computer-aided) to solve energy transmission and distribution problems will be developed. These techniques will be applied to the design, specification and selection of transmission and distribution systems.

### Syllabus

The teaching syllabus will cover the following areas: Transmission Line Constants : Resistance - skin effect - proximity effect. Inductance of single phase line - inductance of three phase line with symmetrical and unsymmetrical spacing - transposed line. Capacitance of single phase line - capacitance of three phase line with symmetrical and unsymmetrical spacing - transposed lines - effect of earth on line capacitance - geometric mean distance - geometric mean radius Overhead Lines: Mechanical characteristics - Conductor - bundled conductors - line supports - spacing between conductors - sag and tension calculations - effect of ice and wind - sag at the time of erection - vibration and dampers Line insulators: Different types - pin type - suspension type - strain type - potential distribution of a string of suspension insulator - string efficiency - equalization of potential - testing of insulators Performance of Transmission Lines: Classification of transmission lines - analysis of short lines- medium line by nominal pi and T methods - rigorous solution of long lines - A, B, C, D constants - Ferranti effect - losses in an open circuited line - power flow through transmission lines Corona: Critical disruptive voltage - visual critical voltage - power loss - factors affecting - methods to reduce corona - radio interference effect Substations : Types - general layout - neutral grounding of transformers, Earthings- reactance, arc suppression coil and Power system earthing. Measurement of earthing resistance. Underground Cables: Single core and three core cables - Insulation Resistance - Stress and capacitance of single core cables - Grading - Extra high voltage cables - Localization of cable faults. Principles of cable selection, co-ordination, introduction to design standards and health and safety issues (IEE Wiring Regulations and Electricity at Work Act), hazard identification and risk reduction.

### Learning Outcomes

On completion of this module the student should be able to:1. Determine the Transmission Line Constants for single phase and three phase transmission lines.(AM1)2. Analyse the mechanical characteristics of overhead lines. (AM1)3. Design and evaluate line Insulator strings(AM1,AM7)4. Develop models and analyse the performance of Transmission Lines using A B C D Constants (AM1)5. Describe the operating characteristics of distribution components. (AM1)6. Select an appropriate cable for a given application in compliance with National Wiring Regulations for LV installations (AM8,AM9)

### Teaching / Learning Strategy

The main teaching method will be based on lectures with laboratory exercises used to relate theoretical concepts to practical experience. The students will be expected to perform directed reading exercises and self-learning exercises on topics related to Transmission and Distribution Systems. Tutorials will be used to reinforce the module material and to discuss the issues raised by the directed reading.

-360 1. Pabla A S, "Electrical Power Distribution", Mac-Graw-Hill, 6 th Ed, 2004. -360 2. J. J. Burke, "Power Distribution Engineering - Fundamentals and Applications", Marcel Dekker, 2 nd Ed. 1994. -360 3. N. G. Hingorani and L. Gyugyi, "Understanding of FACTS: Concept and Technology of Flexible AC Transmission System", Wiley-IEEE Press, 2 nd Ed, 1999. 4. Yong Hua Song and Allan T Johns, "Flexible AC Transmission Systems" , IEE Press, 2000. -360 5. Jos Arrillaga, "HVDC Transmission " , IEE Press, 2Ed, 2000. 6. V.K. Mehta and Rohit Mehta, "Principles of Power Systems", S.Chand Publication, 4 th Ed, 2009.

### Transferrable Skills

Tutorials provide:Problem Solving and Numeracy Laboratories provide: Use of IT and Interpersonal/team skills Reports provide:Communication/Literacy/Linguistic/Critical Evaluation

### Module Structure

Activity Total Hours
Assessment (FT) 16.00
Independent Learning (FT) 100.00
Tutorials (FT) 28.00
Lectures (FT) 56.00

### Assessment Methods

Component Duration Weighting Threshold Description
Coursework 1 n/a 30.00 35% Assignment: Case study Report :(1500 words)
Exam (Exams Office) 3.00 50.00 45% Final Examination - unseen exam: 3 hours
Exam (School) 1.50 20.00 35% Mid-term test - Unseen Test: 1 hour 30 minutes