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Traction Distribution

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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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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Over Head Equipment – Foundation

By on November 25, 2013
Over Head Equipment – Foundation

Foundation should be capable to support the vertical load of mast, bending moment due to static and dynamic load of OHE. Foundation design mainly depends on Soil and conditions prevailing at the location. There are certain masts at which OHE contact wire is terminated thus requiring anchor mast to balance the anchoring load. Types of […]

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2×25 kV Traction System

By on September 13, 2013
2×25 kV Traction System

What is 2×25 kV traction system 2×25 kV traction system means transmission at 50 kV and using at 25 kV voltage system. 50 kV transmission benefits for Improved voltage regulation and reduced transmission line losses Increased Traction Substation spacing Improved Load factor as number of trains fed  per feeding post are more 25 kV traction […]

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Return Conductor and Booster Transformer

By on September 1, 2013

A current carrying conductor produces its own magnetic field around it. This magnetic field varying with time induces an electro – motive force (emf)  in a conductor parallel to the current carrying conductor.  This induced emf disturbs the communication and signalling line and while undertaking electrification works, precautions are required to be taken to prevent this side effect. […]

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25kV Traction Power Supply System

By on August 31, 2013

25 kV Single Phase is the most preferred and universally accepted voltage standard for overhead traction system. Looking for any other voltage system, means every things has got to be developed namely traction power supply system, Over Head Equipment, vehicle traction system etc. In order to increase OHE voltage. 2×25 kV system is developed so that at vehicle level, […]

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