….let's share our railways knowledge

Electrical Engineering and Railways

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 […]

Continue Reading »

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 […]

Continue Reading »

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. […]

Continue Reading »

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 […]

Continue Reading »

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 […]

Continue Reading »

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 […]

Continue Reading »

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 […]

Continue Reading »

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 […]

Continue Reading »

Re-engineering of Stators of Three phase Traction Motors type 6FRA 6068 used in WAG9/WAP7 locomotives for Improving their Reliability

By on January 17, 2014
Re-engineering of Stators of Three phase Traction Motors type 6FRA 6068 used in WAG9/WAP7 locomotives for Improving their Reliability

Research By: R.N.Lal, Senior Executive Director Standards, Ganesh , Director Standards Electrical Directorate , Research Design and Standards Organisation , Lucknow Abstract Insulation and brazed joint failures in the stators of three phase traction motors used in electric locomotives on Indian Railways are primarily on account of excessive shock and vibration and unsupported long length […]

Continue Reading »

Selection of Suspension Arrangement of Traction Motors : A Right Approach

By on January 13, 2014
Selection of Suspension Arrangement of Traction Motors : A Right Approach

Abstract Motor suspension arrangement is of paramount importance for the reliability of traction motors. Another vital input for the selection of traction motor for given motor suspension arrangement is its rotational speed. Non-availability of any complied information on the relationship of rotational speed of traction motors and their mounting arrangement makes the jobs of Rolling […]

Continue Reading »

Top