25 kVA Inverter

Specification No. RDSO/PE/SPEC/AC/0024-2001(Rev- 0).

Description:

A 25 kVA underslung inverter that converts DC supply from coach battery/alternator into stable, regulated 3-phase 415V AC output.
Powers air-conditioning systems and auxiliary loads in LHB AC coaches, supporting both soft start and Direct ON-LINE (DOL) starting.
Underslung type, mounted under the coach underframe for space efficiency.
Built to withstand railway conditions like vibration, shock, humidity, and dust.
Conforms to RDSO Specification No. RDSO/PE/SPEC/AC/0024-2001 (Rev-0), ensuring safety, reliability, and performance.

Input (DC)
Nominal Voltage	110 V DC
Operating Range	90V to 170V DC with 15% ripple (able to withstand 200 V DC for 2 min.)
Output (AC)
Power	25 KVA at 0.8 PF
Output Voltage	415 V AC ± 5% (3-phase, 3-wire system)
Output Frequency	50Hz. (sine wave)
Efficiency	Greater than 85 % at light load & Greater than 92 % at full load
Current Harmonics	Less than 5%
Protections
Over Load	Trip
Single Phasing	Trip
Self-reset Feature	Restarts automatically, if trip condition is normalized
IP Protection	IP-65 for US cubicle; IP20 for on-board cubicle
Output Short Circuit	Provided trip
Over Temperature	Trip when temperature of power device exceed 90°C
Voltage Surge	Voltage surge protection at input side
Reverse Polarity	Reverse polarity protection on input side provided
Earth Fault	Trip
Fault Diagnostic	Inverter display board is provided with self-checking feature and facilities to download data with USB port (supports pen drive) and stores at least 60 latest faults
Construction
Enclosure	2 mm thick SS 304 for US cubicle & 1.6 mm thick CRCA sheet for onboard display cubicle
Overall Length	1230 mm
Overall Depth	1040 mm
Overall Height	650 mm
Mounting	980 × 450 mm
Weight	Less than 450 kg (US cubicle) & Less than 40 kg (OB cubicle)
Cooling	Natural air cooled