Reliable Power Conversion for Efficient and Sustainable Rail Transport

Transformer Rectifier Units (TRUs) are critical components in electric railway systems, providing the necessary power conversion to drive traction motors. 

Designed to operate in demanding environments, TRUs convert high-voltage alternating current (AC) from the overhead catenary or third rail into the direct current (DC) required by traction systems. This AC/DC conversion ensures efficient and reliable propulsion for trains, trams, and metros. 

In traction applications, TRUs must meet strict performance, safety, and durability standards, often integrating advanced cooling systems, protective devices, and remote monitoring capabilities. Their robust design and high efficiency make them essential for modern rail transport, supporting both operational excellence and energy sustainability.

Components tested:

  • Transformer
  • Bus-duct
  • Rectifier unit

Test Performed:

  • Cold Resistance
  • Hot Resistance
  • Harmonic Analysis
  • Audible Sound Level (Rated Voltage)
  • Audible Sound Level (Rated Current)
  • Efficiency, Displacement Power Factor, and Voltage Regulation
  • Current Balance Measurement
  • RI-9 Overload Sequence
  • Short-Circuit Current
  • Transient Surge Voltage
  • Commutating Reactance
  • Loss Measurements
  • Dielectric Strength (Rectifier)
  • Rated Voltage (Rectifier)
  • Temperature Rise (N-1 Diodes)
  • Elevated Ambient

Reference Standards:

  • EN 50327, EN50163, EN 50328, IEC 60076-5 & IEC 60146-1-1
  • IEEE C57.12.90 & IEEE 1653.2