Mell Why neutral section are provided in single phase AC traction as?
Before entering neutral sections, electric locos often switch off power temporarily to the traction motors so as to prevent any transient disturbances and sparking. Because the neutral section is switched between AC and DC supply, it is also known as the dynamic neutral section or the switched neutral section.
Why 25kV is used in electric traction?
The main reason for 25kV voltage used in railway is, that 25 kV AC more economical than 1.5kV DC voltage system. Since 25kV voltage system has higher voltage, the higher voltage reduces the current flow through conductor; this reflects to reduce the conductor size. The cost of the conductor gets less.
What is neutral section in electric traction system?
Neutral Section is defined as short insulated dead overhead equipment separating sectors fed by two adjacent substations which are normally connected to different phases. The neutral section is a dead zone and therefore, the locomotive has to negotiate the section in momentum.
What is neutral section and why is it provided in electric traction?
A neutral section is provided to make it impossible for the pantograph of an electric locomotive or EMU train to bridge the different phases of 25 kV supply, while passing from the zone fed from one sub-station to the next one.
Why are using 50hz supply in electrical traction system?
The high-voltage distribution system at 50 Hz supply is converted to this electric motor rating by transformers and frequency converters. This system employs two overhead lines, and the track rail forms another phase, but this raises many problems at crossings and junctions. Advantages; Fewer substations are required.
Do electric trains run on AC or DC?
AC versus DC for mainlines The majority of modern electrification systems take AC energy from a power grid that is delivered to a locomotive, and within the locomotive, transformed and rectified to a lower DC voltage in preparation for use by traction motors.
What are the advantage of electrical traction?
The electric traction system is the most efficient of all other traction system such as steam and internal combustion (IC) engine type systems. It offers several benefits over other systems, including quick start and stop, very efficient, pollution-free, easy to handle and easy speed control.
Where does 25 kV AC 50 Hz power come from?
25 kV, ac, 50 Hz single phase power supply for electric traction is derived from the grid system of State Electricity Boards through traction sub-stations located along the route of the electrified sections at distances of 35 to 50 km apart.
Are there any locomotives that operate with both DC and AC traction?
The WCAM series of locomotives are designed to operate with both DC and AC traction as they move towards or away from the Bombay DC section. The new [2003] AC-DC EMU rakes used in Mumbai are also designed to operate with both DC and AC traction as the Bombay area switches over to the 25kV AC system. Read more about Mumbai area electrification.
Which is the first line of Indian Railways to be converted to 25kV AC?
Conversion to 25kV AC has already been done on the Titwala-Kasara section; next to be converted are Khapoli-Vangani, Vangani-Thane, and Titwala-Thane. The Madras suburban routes (Madras-Tambaram in the ’60s, extended later to Villupuram) used to be 1.5kV DC until about 1967, when it was converted to 25kV AC (all overhead catenary supply).
Why is 25kV used in railway traction system?
Since 25kV voltage system has higher voltage, the higher voltage reduces the current flow through conductor; this reflects to reduce the conductor size. The cost of the conductor gets less. However, there are 7 major advantages for using 25kV voltage system in railway. Let see… As the voltage increases, the current flow get decreases.