55+5 kVA Transformer

55+5 KVA, 415/190 V, 3 Phase Dry Type Distribution Transformer

Specification No. RDSO/PE/SPEC/AC/0080-2007(Rev.3)

Description :

  • This transformer is a 55+5 kVA, 3-phase, dry type, natural or air-cooled distribution transformer engineered for railway coach for LHB Type AC EOG coaches/ power car/ pantry car/ power car of Indian Railways
  • It steps down 750V AC supply from the power cars to the 415V/190V AC needed for coach power supply.
  • The design follows the Research Designs and Standards Organization (RDSO) specification.
  • RDSO/PE/SPEC/AC/0080-2007(Rev.3) is the governing specification.
  • It governs railway-approved transformer builds for compatibility, safety, and reliability.

Technical Specifications :

Input
Nominal voltage 3 Phase, 4 wire, 750 V ± 5% (line to line), 50 Hz ±3%, THD <10%
Nominal input line current 46.2 A at 750 V
Output
Power 55+5 KVA
Output Voltage i) 55 kVA: 3 Phase, 4 wire, 415 V ± 5% (line to line), 50 Hz ±3%
ii) 5 kVA: 3 Phase, 4 wire, 190 V ± 5% (line to line), 50 Hz ±3%
Nominal output current i) 76.52 A for 55 kVA winding at 415 V
ii) 15.20 A for 5 kVA winding at 190 V
Efficiency >97% from half load to full load
Class of insulation H
Noise level < 60db at 1.0 m distance
Protections
Vector configuration Star – Star – Star (YN0 – YN0 – YN0)
IP Protection IP-67
Winding Wire Super enameled copper winding wire as per IS: 13730 Pt. 13, 13730 Pt. 29
Max. Temp Rise Less than 115°C
Total Weight 465 Kg (Max.)
Construction
Enclosure 2.0 mm thick SS 304 Enclosure / Housing, 5.0 mm thick SS 304 Top Cover
Overall Length 970 mm
Overall Depth 560 mm
Overall Height 650 mm
Mounting 360 mm × 215 mm, 500 mm × 215 mm
Weight Less than 465 Kg
Cooling Natural air cooled