ELECTRICAL DISTRIBUTION SYSTEMS

ELECTRICAL DISTRIBUTION SYSTEMS

UNIT- I

General : Introduction to Distribution systems, an overview of the

role of computers in distribution system planning-Load modeling and

characteristics: definition of basic terms like demand factor, utilization

factor, load factor, plant factor, diversity factor, coincidence factor,

contribution factor and 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 and Substations : Design consideration of

Distribution feeders: Radial and loop types of primary feeders, voltage

levels, feeder-loading. Design practice of the secondary distribution

system. Location of Substations : Rating of a Distribution Substation,

service area with primary feeders. Benefits derived through optimal

location of substations.

UNIT- III

System analysis : Voltage drop and power loss calculations : Derivation

for volt-drop and power loss in lines, manual methods of solution for

radial networks, three-phase balanced primary lines, non-three-phase

primary lines.

UNIT- IV

Protective devices and coordination : Objectives of distribution system

protection, types of common faults and procedure for fault calculation.

Protective Devices: Principle of operation of fuses, circuit reclosers,

line sectionalizer and circuit breakers. Coordination of protective

devices: General coordination procedure.

UNIT-V

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 location.

Economic justification. Procedure to determine the best capacitor

location. Voltage control : Equipment for voltage control, effect of series

capacitors, effect of AVB/AVR, line drop compensation.

REFERENCE BOOKS :

1. “Electric Power Distribution System Engineering “ by Turan Gonen,

Mc.Graw-Hill Book Company,1986.

2. Electric Power Distribution-by A.S.Pabla, Tata Mc Graw-Hill Publishing

Company, 4th edition, 1997.

3. Electrical Distribution V.Kamaraju-Mc Graw Hill