Introduction
The LAX-HLC-21 is a high-performance and reliable hotel load converter designed for 3-phase WAP-7 locomotives. It efficiently converts single-phase 960V power to 750V 3-phase power, making it an ideal solution for Indian Railways. Engineered for energy efficiency, cost-effectiveness, and minimal maintenance, this converter enhances railway operations while ensuring long-term reliability.
System Overview
The LAX-HLC-21 draws single-phase power from the locomotive’s main transformer hotel load winding. Using an IGBT-based line converter, it stabilizes DC link voltage at 1800VDC, independent of input fluctuations. A 3-phase inverter then converts this DC power into a 750V AC sine wave output through Space Vector PWM waveforms, ensuring low harmonic distortion with the help of a sine filter. Input and output contactors provide safe isolation from the power source and connected loads.
Salient Features
| Feature | Description |
| Energy Efficient Design | Optimized for minimal energy loss |
| In-built Redundancy & Safety Features | Ensures continuous and safe operation |
| Modular Construction | Simplifies maintenance and servicing |
| Mounting Options | Can be underframe or onboard mounted |
| Cooling System | Forced air cooling for thermal stability |
| Robust & Reliable | Designed to withstand railway conditions |
| Compliance with International Standards | IEC60571, IEC61287, IEC61373 |
Technical specification
| Category | Specifications |
| Input Data | |
| Nominal Voltage | 960V AC |
| Frequency | 50 Hz |
| Input Power Factor | Close to unity at full load |
| Output Data | |
| Power Output | 500 kVA at ≥ 0.8 power factor |
| Nominal Voltage | 3 × 750V AC (Sine Wave) |
| Nominal Current | 3 × 385A |
| Output Frequency | 50 Hz |
| Control System | |
| Communication Interfaces | RS-485 / CAN / MVB |
| Service Signal | USB |
| Thermal & Mechanical Data | |
| Weight | 1075 kg |
| Dimensions (L × W × H) | 1400 mm × 1040 mm × 1750 mm |
| Mounting Location | Machine Room |
| Cooling System | Forced Air Cooling |
