+91-40-6723 7000    

  1. Pantograph
  2. Vacuum Circuit Breakers
  3. Traction Transformer
  4. Line and Traction Converter(s)
  5. Vehicle Control Cubicle(s)
  6. Auxiliary Converter Cubicle(s)
  7. Hotel Load Converter (HEP)
  8. Traction Motors (AC)
  9. Driver Console (with TFT LCD displays)
  10. Vehicle Remote Monitoring (VRMS)

Medha offers propulsion systems for New or Modernized Electric locomotives. Scope of supply may include complete integrated solutions (point of supply to point of drive) i.e. Pantograph, Vacuum Circuit Breaker, Main Transformer, IGBT Traction Converter(s), Auxiliary Converter, Vehicle Control and Fault Diagnostics system and AC Traction Motors or sub-set of above as per project requirement.


  • Full regeneration capability
  • Independent Motor control with individual motor cut-out
  • Redundant CAN communications over Optic Fiber with Vehicle Control Unit
  • Distributed Power control
  • Event Recording
  • GPS/GSM/CDMA based Remote Monitoring of Locomotives
  • Space and Weight limitation from existing locomotive design
  • Increased Reliability
  • Reduced Maintenance
  • Improved Wheel Slip control and Wheel-Rail Adhesion
  • Modular design

Recent implementation - Electric Locomotive (6000 HP) Propulsion System (Freight/Passenger)

  • Overhead Voltage: 25kV, 50Hz (16kV to 31kV)
    • System upgrade includes – GTO converter to IGBT based Traction Converter, Microprocessor based Vehicle Control, IGBT based Auxiliary Converter, TFT LCD Driver Console, Sensors
  • Retained Equipment – Pantograph, Vacuum Circuit Breaker, Transformer, Traction Motors etc.
  • Traction Transformer - 1 Primary winding, 4 Secondary Traction windings (4 x 1449 kVA), 1 Auxiliary winding (334 kVA), 1 Head End Power winding (945 kVA) (Passenger only)
  • Traction Converters - 2 units, Water cooled
  • Each converter includes – 2 line converters (single phase full bridge IGBT rectifier), DC link (100Hz resonant filter, DC link capacitor bank, over-voltage protection), 3 motor inverters (3-phase full bridge IGBT inverter), 4.5kV 1200A IGBT module
  • Auxiliary Converter - 3 x 132 kVA, (415V 3phase supply and 110V DC battery charger), forced air cooled, 32-bit DSP based auxiliary computer, thyristors for input rectifier & IGBTs for inverter
  • Hotel Load Converter - 2 units, 500kVA 750V 3phase, forced air cooled, IGBT rectifier & IGBT inverter (3.3 kV, 1500A/1200A)
  • Vehicle Control Unit - redundant computers, CAN (over optic fiber) based locomotive communication network, WTB based inter-locomotive communication, provision for radio based distributed power system
  • Driver Interface - 10.4" TFT LCD display

Vision & Mission

To be World Leader in Railway Products

Enjoying Innovation and Applying Technology for improving the lives of people.
Enhancing the image of India in the world, in high technology.

R & D Centre

Behind Mint Compound, Cherlapally, R.R.Dist,
Hyderabad - 500 051 Telangana, India.
Phone: +91-40-6723 7000; Fax: +91-40-2726 4144

Corporate Identity Number:  U31103TG1984PTC004436

MEDHA SERVO DRIVES PVT. LTD. P-4/5B, IDA, Nacharam, Hyderabad - 500 076 Telangana, India
Phone: +91-40-2717 1101; Fax: +91-40-2715 4706