PPT: Transmission Lines & Line Parameters | Power Systems - Electrical Engineering (EE) PDF Download

 Page 1


Transmission Lines & Line 
Parameters
Page 2


Transmission Lines & Line 
Parameters
Modern Power 
Systems
Page 3


Transmission Lines & Line 
Parameters
Modern Power 
Systems
The Evolution of Electrical 
Power Systems
Faraday's Discovery
Electrical technology founded 
on Faraday's discovery that 
changing magnetic flux creates 
an electric field
Edison's DC System 
(1882)
First complete DC power 
system with steam-driven 
generators at 110V, serving 59 
customers within 1.5 km radius
AC Revolution
Development of transformers 
led to AC systems replacing DC 
systems
Modern Era
T oday's systems produce 
hundreds of gigawatts through 
massive generators spinning at 
up to 3000 RPM
Page 4


Transmission Lines & Line 
Parameters
Modern Power 
Systems
The Evolution of Electrical 
Power Systems
Faraday's Discovery
Electrical technology founded 
on Faraday's discovery that 
changing magnetic flux creates 
an electric field
Edison's DC System 
(1882)
First complete DC power 
system with steam-driven 
generators at 110V, serving 59 
customers within 1.5 km radius
AC Revolution
Development of transformers 
led to AC systems replacing DC 
systems
Modern Era
T oday's systems produce 
hundreds of gigawatts through 
massive generators spinning at 
up to 3000 RPM
Key Milestones in Power System Development
Transformers & AC Systems
Development of transformers led to AC systems 
superseding DC systems, enabling more efficient 
power transmission
Tesla's Polyphase Motors
Nikola T esla's polyphase induction motors drove 
development of 3-phase AC systems, leading to 
frequency standardization (60Hz in North 
America, 50Hz elsewhere)
HVDC Transmission
Mercury Arc Valves and thyristors enabled high 
voltage DC transmission, ideal for long-distance 
bulk power transfer and underwater links
Modern Innovations
Recent developments include gas turbines, static 
excitation systems, fast-acting circuit breakers, 
microprocessor relays, and high-power electronic 
converters
Page 5


Transmission Lines & Line 
Parameters
Modern Power 
Systems
The Evolution of Electrical 
Power Systems
Faraday's Discovery
Electrical technology founded 
on Faraday's discovery that 
changing magnetic flux creates 
an electric field
Edison's DC System 
(1882)
First complete DC power 
system with steam-driven 
generators at 110V, serving 59 
customers within 1.5 km radius
AC Revolution
Development of transformers 
led to AC systems replacing DC 
systems
Modern Era
T oday's systems produce 
hundreds of gigawatts through 
massive generators spinning at 
up to 3000 RPM
Key Milestones in Power System Development
Transformers & AC Systems
Development of transformers led to AC systems 
superseding DC systems, enabling more efficient 
power transmission
Tesla's Polyphase Motors
Nikola T esla's polyphase induction motors drove 
development of 3-phase AC systems, leading to 
frequency standardization (60Hz in North 
America, 50Hz elsewhere)
HVDC Transmission
Mercury Arc Valves and thyristors enabled high 
voltage DC transmission, ideal for long-distance 
bulk power transfer and underwater links
Modern Innovations
Recent developments include gas turbines, static 
excitation systems, fast-acting circuit breakers, 
microprocessor relays, and high-power electronic 
converters
Structure of Modern Power 
Systems
AC Generation
3-phase synchronous machines using 
hydro, fossil, and nuclear primary 
energy sources
AC Transmission
Extra high voltage lines (220 kV and 
above) interconnecting large 
generators to major load centers, 
capable of transmitting power over 
1000 km
3-Phase AC Utilization
Most loads are balanced across three phases to maintain system stability, with 
single-phase loads distributed equally
Present-day power systems form a complex network where large thermal power 
plants can transmit up to 2000 MW to distant load centers via multiple 400 kV lines. 
This infrastructure represents one of humanity's most complex engineering 
achievements.