Diesel generator sets (DG sets) are widely used for power backup in residential, commercial, and industrial settings. A 125 kVA DG set is a mid-range generator that is versatile and reliable for many applications. Below, we delve into the technical parameters and features of a 125 kVA diesel generator set to help understand its specifications and applications.
1. Prime Power and Standby Power Generator
- Prime Power: The prime power rating of a generator indicates the maximum power it can deliver continuously under a variable load. For a 125 kVA generator, this is typically the same as the kVA rating, meaning it can deliver 125 kVA continuously.
- Standby Power Generator: This rating is usually 10% higher than the prime power rating. For a 125 kVA DG set, the standby power is around 137.5 kVA. This rating is used during emergency conditions for a limited time.
2. Power Output
- Apparent Power: 125 kVA (kilovolt-amperes).
- Active Power: 100 kW (kilowatts), assuming a power factor of 0.8 (lagging).
- Power Factor: Industrial standard is 0.8.
- Voltage Output: Typically 400Volt for three-phase systems.
- Frequency: Standard frequency is 50 Hz (or 60 Hz, depending on region).
3. Engine Specifications
- Engine Type: Four-stroke, water-cooled, turbocharged diesel engine.
- Number of Cylinders: Usually 4 to 6 cylinders, depending on the manufacturer.
- Displacement: Typically ranges from 5 to 7 liters.
- Cooling System: Radiator-based water cooling system to maintain optimal operating temperature.
- Fuel System: Direct injection system for efficient combustion.
- Governor Type: Electronic or mechanical governor to regulate engine speed.
- Emission Compliance: Most 125 kVA DG sets comply with CPCB-II (India) or Tier 3/4 (USA) emission norms.
4. Alternator Specifications
- Type: Brushless, self-excited alternator for reduced maintenance.
- Insulation Class: Class H for better thermal endurance.
- Voltage Regulation: ±1% for stable output voltage.
- Efficiency: Alternator efficiency typically ranges between 85% and 92%.
5. Control Panel Features
- Type: Digital control panel with microprocessor-based controller.
- Functions:
- Start/stop functionality.
- Engine and alternator parameter monitoring (voltage, current, frequency, power factor, etc.).
- Alarm indications for low oil pressure, high engine temperature, overload, and more.
- Auto-mains failure (AMF) capability for seamless switching during power outages.
- Connectivity: Some models include remote monitoring through GSM/GPRS or IoT integration.
6. Fuel System and Consumption
- Fuel Type: High-speed diesel (HSD).Not Used Bio Diesel
- Fuel Tank Capacity: Generally ranges from 150 to 200 liters, providing 6 to 8 hours of operation at full load.
- Fuel Consumption:
- At full load: Approximately 25-30 liters per hour.
- At 75% load: Around 18-22 liters per hour.
7. Dimensions and Weight
- Dimensions: Compact design with typical dimensions around 2.5m (L) x 1.0m (W) x 1.5m (H).
- Weight: Varies between 1,200 kg and 1,800 kg, depending on the brand and configuration.
- Enclosure: Soundproof canopy with noise levels below 75 dB at 1 meter distance.
8. Starting System
- Type: Electric start system with 12V or 24V battery.
- Battery Capacity: 100Ah to 150Ah, depending on the starting system requirements.
9. Safety Features
- Overload Protection: Circuit breakers to protect against excessive load.
- Low Oil Pressure Shutdown: Prevents engine damage due to insufficient lubrication.
- High Temperature Shutdown: Automatically shuts down the generator if the engine temperature exceeds safe limits.
- Emergency Stop: Manual emergency stop button for immediate shutdown.
10. Operational Features
- Run Time: Designed for continuous operation up to 500 hours with routine maintenance.
- Maintenance Interval: Typically every 250-500 hours, depending on the manufacturer’s recommendations.
- Ambient Temperature Range: Operates efficiently between -10°C to 50°C.
- Altitude: Designed to function at altitudes up to 1,000 meters without derating.
11. Applications
- Commercial: Used in hotels, malls, hospitals, and offices for backup power.
- Industrial: Suitable for small to medium-sized manufacturing units and workshops.
- Residential: Provides backup power for apartment complexes and gated communities.
- Construction: Temporary power supply for construction sites.
12. Compliance and Certifications
- Compliance with local emission standards (e.g., CPCB-II in India, EPA Tier 3/4 in the USA).
- ISO 8528 certification for performance and reliability.
- Soundproofing compliant with noise pollution standards.
13. Optional Features
- Synchronizing Capability: Allows parallel operation with other generators or the grid.
- Automatic Transfer Switch (ATS): Enables seamless switching between grid and generator power.
- Weatherproof Enclosure: Suitable for outdoor installations.
- Customized Fuel Tanks: Extended fuel tanks for longer operation.
14. Key Considerations for Selection
When choosing a 125 kVA DG set, consider the following factors:
- Load Analysis: Ensure the generator’s capacity matches the power requirements, including starting currents for motor loads.
- Fuel Efficiency: Look for models with optimized fuel consumption.
- Service Network: Opt for a brand with a reliable service network and readily available spare parts.
- Warranty: Check the warranty period and terms for the generator and its components.
Technical Parameters of a 125 kVA Diesel Generator Set.
Conclusion
A 125 kVA diesel generator set is an ideal choice for medium-scale power backup needs. Its robust design, efficient performance, and compliance with modern emission norms make it a reliable solution for various applications. By understanding the technical parameters and key features, users can select a DG set that aligns with their specific requirements, ensuring uninterrupted power supply and operational efficiency.