electric_traction_system

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ELECTRIC TRACTION SYSTEMS
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MOTIVATION

• Sheer size and roaring sound.
• Use of electronics to bring down distance and
  time.
• A fascination for electrical students
• - Use of traction motors
• - Speed Control
• - Braking

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TOPICS TO BE DISCUSSED

• Traction system, its classification and
  nomenclature.
• Power Supply in Electric Traction (AC and DC
  systems).
• Traction motors used.
• Control of traction motors.
• Braking.

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TRACTION SYSTEM, ITS CLASSIFICATION AND
NOMENCLATURE
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INTRODUCTION

• Traction - locomotion on the rails (driving force
  - steam or electric drive)
• Classification of Traction Systems
• gt Non-Electric
• gt Electric
• - receive electricity externally
• - self contained locomotives

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NOMENCLATURE IN INDIAN RAILWAYS

Name consists of four parts
e.g. WDP2 Diesel-Electric Passenger train
running on broad gauge
A ? AC Traction D ? Diesel-Electric Traction
(Not DC Traction)
P ? Passenger G ? Goods M? Mixed (Passenger
and Goods) S ? Shunting
W ? B.G. Y ? M.G. Z ? N.G.
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TYPES OF RAILWAY SERVICES
TYPES OF GAUGES USED

• Main line service
• City service or urban service
• Sub-urban service

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SYSTEMS OF TRACK ELECTRI-FICATION

• Direct current system
• Single phase low frequency a.c system
• Single phase high frequency a.c system
• Three phase a.c system
• Composite system
• - Single phase to Three phase - Single
  Phase to Direct Current

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POWER SUPPLY IN ELECTRIC TRACTION (AC AND DC
SYSTEMS)
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• POWER SUPPLY IN ELECTRIC TRACTION
• Conductor Rail System
• Overhead System

Contact strips
Horn
Pantograph arm
Fig Pantograph and its parts
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OVERHEAD LINE CATENARY
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TYPES OF OVERHEAD CATENARY
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CONTROLOFTRACTION MOTORS
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CONTROL OF DC TRACTION MOTORS

• Series-Parallel Control

• Rheostatic Control

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CONTROL OF DC TRACTION MOTORS (Contd.)

• Field Weakening Method

• Diesel-Electric Locomotive Control

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CONTROL OF AC INDUCTION MOTOR

• Rheostatic Control
• Pole-Changing Control
• Cascade Control
• Combination of Cascading and Pole-Changing Control

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BRAKINGOFTRACTION MOTORS
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BRAKING

• Electrical Braking
• - Plugging
• - Rheostatic Braking
• - Regenerative Braking
• Mechanical Braking
• - Compressed Air Brake
• - Vacuum Brake
• - Magnetic Track Brake

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REGENERATIVE BRAKING
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ADVANCED TRACTION SYSTEMS

• Multiple Unit Traction System (EMU, DMU)
• Driving force from multiple units
• EMU suburban railway transport
• Rheostatic Control

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CONCLUSION

• Advanced technologies Magnetic Levitation used
  for ultra high speed trains
• Electric traction economical, easy and safe

ANY QUESTIONS ???