This document provides an introduction to electric power systems. It discusses the key components of power systems including generators, transformers, substations, and loads. It also outlines the different voltage levels used in transmission and distribution networks. Specifically, it notes that transmission occurs at voltages such as 765kV, 400kV, and 220kV, while distribution occurs at lower voltages like 11kV, 415V, and 230V for households. The document aims to give students an overview of the structure and components that make up electric power systems.

1. Introduction to the course

2. Electric Power System
ELE 101 / 102 Dept of E & E Engg, MIT Manipal 21
Branch of Electrical Engineering which deal with the
Technology of
Generation,Generation,
Transmission andTransmission and
DistributionDistribution
DC Power system
Pearl Street Station in New York City, 1882
“Illuminating Companies” by Thomas A. Edison
Three phase AC Power System, 1896
2 Generators & Transmission line @ 25 Hz

3. Power System Structure
S U B T R A N S M I S S I O N
N E T W O R K
E H V A C : 7 6 5 k V , 4 0 0 k V
H V A C : 2 2 0 k V
H V D C : ± 5 0 0 k V
1 3 2 k V , 1 1 0 k V ,
6 6 k V , 3 3 k V
T R A N S M I S S I O N
N E T W O R K
G E N E R A T I O N
T O O T H E R
P O O L M E M B E R
T O O T H E R
P O O L M E M B E R
V e r y l a r g e
C u s t o m e r s
L a r g e
C u s t o m e r s
M e d i u m
C u s t o m e r s
S m a l l C u s t o m e r s
( 3 P h a s e 4 1 5 V / 1 P h a s e , 2 4 0 V )
D I S T R I B U T I O N
N E T W O R K
1 1 k V
4 1 5 V
P r i m a r y
S e c o n d a r y
3 P h a s e , 5 0 H z
1 1 k V t o 2 2 k V
ELE 101 / 102 Dept of E & E Engg, MIT Manipal 3

4. Components of Power System
ELE 101 / 102 Dept of E & E Engg, MIT Manipal 4
Generators:
Alternators, 3 phase, AC, 50 Hz, 11 – 22 KV
Transformers:
Voltage level conversion without changing frequency and power
Ex: 11KV to 220KV, 22KV to 132KV, 110KV to 11KV, 11 KV to
415V
Substations:
Control centre for Distribution network
Loads:
Electrical Load: Motors, household appliances, lighting
Mechanical Load: Pulleys, Fans, Flooring machine, blowers, etc.

5. Transmission & Distribution Voltage Levels
ELE 101 / 102 Dept of E & E Engg, MIT Manipal 5
Transmission Networks – EHV AC or HVDC
Operates @ 765 kV/ 400 kV/ 220 kV AC or ± 500 kV DC
AC Sub-Transmission Networks
Operates @ 132 kV/ 110 kV/ 66 kV/ 33 KV
AC Distribution Network
Primary side: 11 kV
Secondary side: 415 V, 4 wire
AC Household
230 V, 50 Hz, Single phase

6. Transmission & Distribution Voltage Levels
ELE 101 / 102 Dept of E & E Engg, MIT Manipal 5
Transmission Networks – EHV AC or HVDC
Operates @ 765 kV/ 400 kV/ 220 kV AC or ± 500 kV DC
AC Sub-Transmission Networks
Operates @ 132 kV/ 110 kV/ 66 kV/ 33 KV
AC Distribution Network
Primary side: 11 kV
Secondary side: 415 V, 4 wire
AC Household
230 V, 50 Hz, Single phase