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Supply frequency in 25KV single-phase system is
60 Hz
50 Hz
25 Hz
16 Hz
50 Hz
The standard supply frequency for the Indian Railway's 25 kV AC traction system is 50 Hz. This frequency is adopted to maintain compatibility with the national power grid frequency used for domestic and industrial applications.
The standard supply frequency for the Indian Railway's 25 kV AC traction system is 50 Hz. This frequency is adopted to maintain compatibility with the national power grid frequency used for domestic and industrial applications.
VtractionтАЛ=25┬аkV тАФ Nominal supply voltage
f=50┬аHz тАФ Standard grid frequency in India
The 25 kV AC traction system draws power directly from the national power grid via step-down transformers. Since the grid operates at a nominal frequency of 50 Hz, the locomotives use transformer-rectifier sets (or power electronics like IGBT-based converters) to convert the high-voltage 50 Hz AC to the required DC voltage for traction motors.
25 kV AC single-phase system is the most widely used traction system in India.
The use of 50 Hz allows for easier tapping from the commercial power network.
It minimizes the need for separate dedicated power generation for railways.
Lower infrastructure cost due to standard grid frequency usage
High efficiency in power transmission over long distances
Compatibility with national electrification targets
Presence of harmonics due to power electronic converters
Unbalanced loading on the three-phase grid due to single-phase traction supply
Mainline Indian Railway electrification
High-speed rail corridors
Option A (60 Hz) is the standard frequency in the USA.
Option C (25 Hz) and D (16.67 Hz) were historically used in early European rail systems to reduce commutation issues in series motors, but are not standard in India.
B is correct тАФ The Indian railway electrification system operates at a standard power frequency of 50 Hz.
Always remember that India strictly follows the 50 Hz standard for both commercial and traction power, unlike some European countries that use 16.67 Hz.