electric traction system (2)
Post on 08-Apr-2015
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ELECTRIC TRACTION ELECTRIC TRACTION SYSTEMSSYSTEMS
Prepared By :
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
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.
TRACTION SYSTEM, ITS CLASSIFICATION
AND NOMENCLATURE
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
NOMENCLATURE IN INDIAN RAILWAYS
Name 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
TYPES OF RAILWAY SERVICES Main 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 m
4. Light Gauge (L.G) 0.610 m
TYPES OF GAUGES USED
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
POWER SUPPLY IN ELECTRIC TRACTION
(AC AND DC SYSTEMS)
POWER SUPPLY IN ELECTRIC TRACTION
•Conductor Rail System•Overhead System
Horn
Pantograph arm
Contact strips
Fig: Pantograph and its parts
OVERHEAD LINE CATENARY
TYPES OF OVERHEAD CATENARY
CONTROLOF
TRACTION MOTORS
CONTROL OF DC TRACTION MOTORS
• Rheostatic Control •Series-Parallel Control
CONTROL OF DC TRACTION MOTORS (Contd.)
• Field Weakening Method
• Diesel-Electric Locomotive Control
CONTROL OF AC INDUCTION MOTOR
• Rheostatic Control
• Pole-Changing Control
• Cascade Control
• Combination of Cascading and Pole-Changing Control
BRAKINGOF
TRACTION MOTORS
BRAKING• Electrical Braking
- Plugging- Rheostatic Braking- Regenerative Braking
• Mechanical Braking- Compressed Air Brake- Vacuum Brake- Magnetic Track Brake
REGENERATIVE BRAKING
ADVANCED TRACTION SYSTEMS
• Multiple Unit Traction System (EMU, DMU)
• Driving force – from multiple units
• EMU – suburban railway transport
• Rheostatic Control
CONCLUSION
• Advanced technologies – Magnetic Levitation used for ultra high speed trains
• Electric traction – economical, easy and safe
ANY QUESTIONS ???
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