27-12-2012, 06:08 PM
DEADMAN HANDLE & ELECTRIC TRACTION
DEADMAN HANDLE.pptx (Size: 1.73 MB / Downloads: 35)
DEADMAN HANDLE
Dead Man's Handle refers to an old train device.
It was typically some form of switch that the driver would keep closed.
The aim of the dead man's handle was to protect the passengers, even in the worst possible case.
DEADMAN SYSTEM (DMS)
The purpose of the deadman system is to apply the emergency braking on the train in the event of the driver becoming incapacitated or leaving the controls in an emergency.
Two of the primary components of this system were the -deadman foot pedal and the master controller T-bar handle
Dead-man system maintenance
The dead-man system was a critical safety component of trains.
It’s subject to daily tests by drivers during their preparation before taking the train out at the start of the day’s operations.
Working of dead-man Handle
. A simple device was called "dead man's pedal". Simply keep it pressed down to apply power to the train.
Release it and in some systems automatically even the brakes applied.
What is a traction..?
The act of drawing or pulling.
When the above act is done by electricity, then it is nothing but electric traction.
Electric traction also means a locomotive in which the propulsion (tractive or driving) is obtained by the use of electricity.
HISTORY
Frank Sprauge is known as "The Father of Electric Traction”.
The world's first electric tram line opened in Lichterfelde near Berlin, Germany, in 1881 & The first use of electrification on a mainline was on a four-mile stretch of the Baltimore Belt Line of the Baltimore and Ohio Railroad (B&O) in 1895
Conclusion
In selecting the motors for traction, dc series motor give high starting torque hence it is widely used in traction. Moreover traction with electricity is pollution free and can be maintained easily with low cost.