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Operating voltage for Composite locomotive
600 to 750 V
22 kV to 25 kV
1500 V
3000 V
22 kV to 25 kV
Modern electric locomotives, specifically those used in Indian Railways, are designed to operate on a standard AC traction system with a nominal voltage of 25 kV at 50 Hz. The term 'Composite locomotive' refers to multi-system or modern electric locomotives capable of handling the high-voltage overhead catenary supply.
Modern electric locomotives, specifically those used in Indian Railways, are designed to operate on a standard AC traction system with a nominal voltage of 25 kV at 50 Hz. The term 'Composite locomotive' refers to multi-system or modern electric locomotives capable of handling the high-voltage overhead catenary supply.
VlineтАЛ=25┬аkV тАФ Standard AC overhead line voltage
f=50┬аHz тАФ Standard grid frequency in India
The 25 kV AC supply from the overhead line is collected via a pantograph and fed to a roof-mounted transformer. This step-down transformer reduces the high AC voltage to lower levels suitable for the power converter unit. The converter utilizes power electronic switches (IGBTs) to rectify and invert the supply into variable voltage, variable frequency (VVVF) AC to drive three-phase induction traction motors.
25 kV AC is the standard traction voltage for Indian Railways main lines.
The system uses a single-phase supply which is converted on-board.
Modern locomotives use IGBT-based power electronics for efficient energy management.
Composite locomotives are designed to be robust against voltage fluctuations in the range of 19 kV to 27.5 kV.
High efficiency due to high voltage transmission (lower I2R losses).
Capability to pull heavy freight loads and high-speed passenger trains.
High insulation requirements for overhead equipment (OHE).
Requires complex on-board conversion hardware.
Electric locomotive propulsion in Indian Railways.
High-speed rail and heavy-haul freight corridors.
1500 V DC was historically used in Mumbai suburban sections but is currently being phased out in favor of the 25 kV AC system.
3000 V DC is a standard used in some international railway networks but is not the primary standard for Indian locomotive traction.
B is correct тАФ Modern electric locomotives in India operate on a nominal overhead line voltage of 25 kV AC.
Remember that 25 kV AC is the national standard for main-line electric traction in India, while DC systems (like 1.5 kV) are largely legacy systems being converted.