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Electrical Engineering and Railways

Weight Transfer during Braking

By on June 5, 2014
Weight Transfer during Braking

On application of brakes on the vehicle, inertia forces are set up. The braking force is applied at lesser height whereas the vehicle load is at a higher height, resulting a couple to act on the body of the vehicle. This results an additional loading on leading bogie as compared to trailing bogie. Let H […]

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Overhead Equipment – Section Insulator

By on March 29, 2014
Overhead Equipment – Section Insulator

Section Insulator is a device installed along with the contact wire for insulating two elementary sections where the pantograph of the locomotive negotiates smoothly and maintaining the current continuity. It is used in crossover, turnouts, maintenance pits and  yard line, etc. During movement of locomotive pantograph, it first passes over the runner and smoothly glides […]

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Overhead Equipment – Overlaps

By on March 29, 2014
Overhead Equipment – Overlaps

In electrical circuit, the series and parallel connections are made using junction box, twisted of cables together, soldering, brazing, etc. This is not possible in case of overhead contact and catenary wire. Similar purpose in OHE is achieved  through overlaps. Overlap is defined as an arrangement where two set of contact wire runs together in parallel […]

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Over Head Equipment – Neutral Section

By on March 25, 2014
Over Head Equipment – Neutral Section

Electrical power is generated in three phases with each phase having a phase shift of 1200. The utility power supply system also expects equal loading on all phases. Traction power system works on single phase 25kV traction system. It now becomes important to use all the three phases equally and convert them into one phase […]

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Over Head Equipment – Cantilever

By on March 23, 2014
Over Head Equipment – Cantilever

Cantilever hold the assembly of contact wire , catenary and dropper assembly. It transfers all vertical load, lateral forces and bending moment load through insulator to Mast. It is an insulated swiveling type structural member and keeps the overhead catenary system in a position assisting smooth current collection by the pantograph at the designed speed. […]

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Introspection of the Energy Conservation Success of Indian Railways as stated in Vision 2020 document

By on February 23, 2014

Energy conservation finds a mention in the vision statement of Indian Railways. Was it a show case to impress someone those matters? Is Indian Railways honestly used the buzz word ‘Energy Conservation’ and implemented it in its grass root policies? There is no scope to question the energy efficiency in any of the based specification […]

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Understanding electical cable and and its role in fire

By on February 20, 2014
Understanding electical cable and and its role in fire

Cables are used for transport of electric power from one place to another with freedom to take it through any available space. Transmission of electric power through cable has the following advantage over overhead wire Very less right of way Lower visibility Minimum effect due to bad weather like storm etc Aesthetic with clear sky […]

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How a locomotive works a train?

By on February 16, 2014
How a locomotive works a train?

When we were child, looking at the mammoth size of steam engine powering the train was a wonderful sight. The wheel in front of the loco pilot was assumed to be driving wheel similar to road vehicle.  Self steering rail-wheel profile is the reason for negotiating on curve and the wheel in front of the […]

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Selection of Traction System Voltage for rail transport

By on February 6, 2014

Many Traction systems have been developed over the period depending on dominant  technologies at that time and traffic demand. Traction system for urban, Sub-urban and main line transport developed over the period are at 750V DC, 1500V DC, 25kV AC, 2x25kV and 50kV AC. 750 and 1500 V DC are mainly for urban transport whereas […]

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Eternal War between Alternating and Direct Current continuing for Rail Transport

By on February 6, 2014
Eternal War between Alternating and Direct Current continuing for Rail Transport

AC versus DC is a subject of debate over the century for different applications of power. DC arrived first at the scene of illuminating the house in 1850’s with many patents to the credit of Thomas Edition. The use of AC for power supply distribution taken up by entrepreneur cum engineer George Westinghouse in 1880s […]

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