Electrical Distribution system JNTU Syllabus
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY
IV Year B.Tech EEE I-Sem T P C
4+1* 0 4
ELECTRICAL DISTRIBUTION SYSTEMS
UNIT – 1GENERAL CONCEPTS
Introduction to distribution systems, Load modelling and characteristics. Coincidence factor, contribution
factor loss factor – Relationship between the load factor and loss factor. Classification of loads
(Residential, commercial, Agricultural and Industrial) and their characteristics.
UNIT – II DISTRIBUTION FEEDERS
Design Considerations of Distribution Feeders: Radial and loop types of primary feeders, voltage levels,
feeder loading; basic design practice of the secondary distribution system.
UNIT – III SUBSTATIONS
Location of Substations: Rating of distribution substation, service area within primary feeders. Benefits
derived through optimal location of substations.
UNIT – IV SYSTEM ANALYSIS
Voltage drop and power-loss calculations: Derivation for voltage drop and power loss in lines, manual
methods of solution for radial networks, three phase balanced primary lines.
UNIT – V PROTECTION
Objectives of distribution system protection, types of common faults and procedure for fault calculations.
Protective Devices: Principle of operation of Fuses, Circuit Reclosures, line sectionalizes, and circuit
UNIT – VI COORDINATION
Coordination of Protective Devices: General coordination procedure.
UNIT – VII COMPENSATION FOR POWER FACTOR IMPROVEMENT
Capacitive compensation for power-factor control.
Different types of power capacitors, shunt and series capacitors, effect of shunt capacitors
(Fixed and switched),
Power factor correction, capacitor allocation – Economic justification – Procedure to
determine the best capacitor location.
UNIT – VIII VOLTAGE CONTROL
Voltage Control: Equipment for voltage control, effect of series capacitors, effect of
AVB/AVR, line drop compensation.
1. “Electric Power Distribution system, Engineering” – by Turan Gonen, Mc Graw-hill Book Company.
2. Electric Power Distribution – by A.S. Pabla, Tata Mc Graw-hill Publishing company,
4th edition, 1997.
1. Electrical Power Distribution and Automation by S.Sivanagaraju, V.Sankar, Dhanpat
Rai & Co, 2006
2. Electrical Power Distribution Systems by V.Kamaraju, Right Publishers.