Download - Electric Traction System
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ELECTRIC TRACTION
SYSTEMS
Prepared By :
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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:> Non-Electric
> Electric
- receive electricity externally- self contained locomotives
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NOMENCLATURE IN INDIAN
RAILWAYSName consists of four parts
e.g. WDP2: Diesel-Electric Passenger train running on broad gauge
W/Y/Z
(Gauge
type)
A/D
(Mode of
traction)
P/G/M/S
(What for it
is used)
2/4/6/2C
(Model
No.)
W B.G.
Y M.G.
Z N.G.
A AC Traction
D Diesel-Electric
Traction (Not DC Traction)
P Passenger
G Goods
M Mixed (Passenger and Goods)S Shunting
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TYPES OF RAILWAY SERVICESMain line service
City service or urban service
Sub-urban service
Type of Gauge Gauge Width
1. Standard Gauge or Broad Gauge (B.G) 1.676 m
2. Meter Gauge (M.G) 1.0 m
3. Narrow Gauge (N.G) 0.762 m4. Light Gauge (L.G) 0.610 m
TYPES OF GAUGES USED
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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
Horn
Pantograph arm
Contact strips
Fig: Pantograph and its parts
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OVERHEAD LINE CATENARY
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TYPES OF OVERHEAD
CATENARY
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CONTROL
OF
TRACTION MOTORS
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CONTROL OF DC TRACTION
MOTORS
Rheostatic Control Series-Parallel 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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BRAKING
OF
TRACTION 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 andsafe
ANY QUESTIONS ???