## Tractive Effort for Propulsion of Train

Manish Kumar Saini

Updated on 20-May-2022 12:12:25

What is Tractive Effort?The effective force required for propelling a train at the wheel of locomotive is known as the tractive effort. It is denoted by 𝑭𝒕 and is measured in Newton. It is a vector quantity always acting tangential to the wheels of the locomotive.Tractive Effort for Propulsion of ... Read More

## Speed Time Curve of Electrical Traction System

Manish Kumar Saini

Updated on 19-May-2022 13:58:59

What is a Speed-Time Curve?Speed-time curves are the most convenient means of studying the movement of trains and their energy consumption. A speed-time curve is defined as the graph plotted between the speed and time, by taking speed (in km/hour) on the Y-axis and time (in seconds or minutes) on ... Read More

## Electric Traction: Power Output and Energy Output at Driving Axles

Manish Kumar Saini

Updated on 19-May-2022 13:54:27

Power Output from the Driving AxlesLet, 𝐹𝑡 = Tractive effort in Newton𝑉 = Speed of the train in kmphSince, the power output is defined as the work done per unit time, i.e., $$\mathrm{Power\: output, \mathit{P}\mathrm{\: =\: }Rate\: of \: work\: done\mathrm{\: =\: }\frac{Work \: done}{time}}$$\mathrm{\Rightarrow \mathit{P}\mathrm{\: =\: }\frac{Tractive\: effort\times Distance}{Time}\mathrm{\: ... Read More

## Plain Rheostatic Starting of Traction Motors

Manish Kumar Saini

Updated on 19-May-2022 13:50:57

In the plain rheostatic starting method, the voltage across the traction motor is gradually increased from zero to full line voltage and the current is kept constant at normal rated value by reducing the external resistance gradually.Let, 𝑇 = Starting period in seconds𝑉 = Line voltage in volts𝐼 = Constant ... Read More

## Methods of Starting and Controlling the Speed of DC Traction Motors

Manish Kumar Saini

Updated on 19-May-2022 13:47:25

In this article, we will take a look at the various methods used for starting and controlling the speed of DC series motors.Rheostatic ControlThe basic traction motor circuit with rheostatic starting is shown in the figure below.A DC series motor can be started by connecting an external resistance in series ... Read More

## Methods for Closing and Opening of Contactors in Railway

Manish Kumar Saini

Updated on 19-May-2022 13:43:59

In electric traction, the control equipment is required for −Connecting the motors to the supply mains without taking excessive current at start and provide smooth acceleration without causing sudden shock so as to avoid damage to the coupling.Adjusting the speed as per requirement.Providing rheostatic or regenerative braking.The master controller system ... Read More

## Mechanical Braking Systems for Electric Trains: Requirement and Types of Mechanical Brakes

Manish Kumar Saini

Updated on 19-May-2022 13:41:37

Mechanical BrakingFor stopping the electric train and holding it stationary, in addition to the electric brakes, the mechanical brakes are also required. The mechanical braking is required because the electric braking is unable to hold the train at standstill.In modern electric locomotives, the regenerative braking is employed down to a ... Read More

## What are the major equipment at a Traction Substation?

Manish Kumar Saini

Updated on 19-May-2022 13:38:52

What is a Traction Substation?An electric substation which converts electric power from the form provided by the electric utility company to an appropriate voltage, current and frequency to supply railways and other electric traction systems is known as a traction substation.Major Equipment of Traction SubstationThe main equipment which are provided ... Read More

## Interference with Communication System in Electric Traction

Manish Kumar Saini

Updated on 19-May-2022 13:34:06

This article explains the phenomenon of interference with the communication systems caused by the electric power lines employed for traction purposes. The phenomenon which modifies a signal in a disruptive manner, when the signal travels along a communication channel between its transmitter and receiver is known as interference in the ... Read More

## Electric Traction Motor: Linear Induction Motor

Manish Kumar Saini

Updated on 19-May-2022 13:29:57

Linear Induction MotorA linear induction motor is a special type of induction motor that gives linear motion instead of rotational motion, as in the case of a conventional motion. In case of linear induction motor, the movement of field and movement of the conductors are linear.Construction and Working of Linear ... Read More

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