I.Core answer
The rated output voltage of Huaquan low-voltage generator sets is 400V/230V (three-phase four-wire system), which is also the standard voltage level for industrial and commercial electricity use in China. among which
- 400V: Three-phase line voltage (between U-V-W phases), used for industrial equipment and high-power loads
- 230V: Single-phase phase voltage (between any phase and the neutral line), used for lighting, uredska oprema, and household appliances
| Voltage type | voltage value | wiring method | Applicable load |
| Three-phase line voltage | 400V | U-V-W three-phase | Industrial motors, klima uređaji, pumpe za vodu, kompresori |
| Single-phase voltage | 230V | Any phase + neutral line | Rasvjeta, računala, electrical outlets, and small devices |
Huaquan Power reminds you that Huaquan low-voltage generator sets are suitable for the full power range from 30kW to over 2000kW, making them the most mainstream voltage level of generator sets in the domestic market.
II.Detailed Explanation of Technical Parameters
- Standard voltage parameters
| parameter item | Huaquan standard value | explanation |
| rated voltage | 400V/230V | Three-phase four-wire system, 50Hz |
| faktor snage | 0.8 (lagging) | General standards in the power generation industry |
| wiring method | Three-phase four-wire, Y connection | Standard industrial wiring |
| Steady-state voltage regulation | ≤±1% | The output voltage is stable and has high precision |
| Transient voltage regulation | ＋20%～－15% | Deal with sudden increase/sudden decrease of load |
| Voltage stabilization time | ≤1 second | Quick recovery after loading |
- Correspondence between voltage and current of different power units
| unit power | rated voltage | rated current | Applicable scenarios |
| 30kW | 400V/230V | 54A | Dom koristiti, small shop |
| 75kW | 380V/220V (three-phase four-wire) | 135A | Small construction sites, škole |
| 100kW | 400V/230V | 180A | Large factories, bolnicama |
| 180kW | 400V/230V | 324A | Construction site, crusher, mixing plant |
| 280kW | 400V/230V | 504A | Industrial park, podatkovni centar |
| 400kW | 400V/230V | 720A | Large-scale industrial projects |
| 700kW | 400V/230V | 1260A | Mines, large factories |
| 1250kW | 400V/230V | 2250A | Ultra-large projects, power stations |
| 1400kW | 400V/230V | 2520A | Podatkovni centar, overseas engineering |
III. Origin of 400V/230V
Why is it 400V instead of 380V?
The rated voltage of a generator is typically 5% higher than the rated voltage of the power grid to compensate for voltage drops on the transmission lines
- Historical standard: 380V (old national standard)
- Current standard: 400V (IEC international standard)
- The 220V single-phase voltage is also upgraded to 230V
China has adopted the IEC standard since 2003, adjusting the low-voltage distribution voltage from 380V/220V to 400V/230V. Trenutno, Huaquan low-voltage units are uniformly shipped at 400V/230V, which is fully compatible with existing power grids and equipment.
- Three-phase four-wire Y connection
The Huaquan low-voltage generator set adopts a three-phase four-wire, Y-connection method:
- Three-phase: U, V, W three-phase lines, with phase differences of 120° from each other
- 10: Neutral line (N line), koji, together with the three-phase lines, constitutes a three-phase four-wire system
- Y-connection: One end of the three-phase windings is connected together to form a neutral point, and the other end leads out the phase lines
| Wiring type | napon | purpose |
| Phase voltage (any phase → N) | 230V | Rasvjeta, sockets, uredska oprema |
| Line voltage (U→V/U→W/V→W) | 400V | Industrial motors, klima uređaji, and water pumps |
IV.Comparison between 400V and high-voltage units
| comparative dimension | Huaquan low-voltage unit | Huaquan high-pressure unit |
| voltage level | 400V/230V | 3kV～13.8kV |
| Typical power | 30-2000kW | 500-5000kW |
| current magnitude | Large (1000kW→1800A) | Mali (1000kW→61.9A) |
| transmission distance | Nearby (≤500 meters) | Far (several tens of kilometers) |
| Line loss | Significant (large I²R) | minimal |
| equipment cost | low | tall |
| Operational Security | Relatively safe (low voltage) | High-voltage qualification is required |
| Applicable scenarios | On-site power distribution, small and medium-sized loads | Long-distance power transmission, large centralized load |
Selection suggestions:
- When the load is less than 500 meters away from the generator, a low-voltage unit is sufficient
- If the distance between the load and the generator is greater than 1000 metara, it is recommended to choose a high-voltage unit
- For standalone power > 1000kW: Consider implementing a high-voltage solution to reduce current
V.Voltage quality assurance
- AVR automatic voltage regulation
The Huaquan low-voltage generator set comes standard with an AVR (Automatski regulator napona), which continuously monitors the output voltage and automatically adjusts the excitation current.
| function | performanse |
| Steady-state accuracy | ≤±1%, voltage stability during load changes |
| transient response | When the load is suddenly applied/removed, the voltage recovers within 1 second |
| Scope of application | With a load variation of 0-100%, the voltage remains within ±5% of the rated value |
- Insulation level and protection
| parameter | Huaquan Standard | meaning |
| insulation class | H level | Maximum allowable temperature of 180℃, high temperature resistance, and long lifespan |
| Protection level | IP22 (open-shelf type) | Protect against solid objects larger than 12mm and vertical water droplets |
| Advantages of H-grade insulation | It has a higher temperature resistance than Class F (155℃) | Stronger overload capacity and longer lifespan |
VI.Application Scenarios
The Huaquan low-voltage 400V/230V generator set is suitable for the following scenarios:
| Scenariji primjene | Recommended Power | special requirements |
| Household reserve | 10-50kW | Silent type, automatic switching |
| gradilište | 50-200kW | Mobile trailer, rainproof shed |
| Hospital/Data Center | 200-800kW | Automated ATS, niska buka |
| Factory/Industrial Park | 100-1000kW | Open-shelf or parallel operation of multiple machines |
| Mine/oil field | 300-2000kW | Containerized, parallel system |
| Hotel/shopping mall | 100-500kW | Silent type, automated |
| Farm/Agriculture | 30-150kW | Fourth, protection and easy operation |
VII. Common Issues
P1: Is Huaquan’s low-voltage generator 380V or 400V?
A: The standard output voltage of Huaquan low-voltage Generatori je 400V/230V (compliant with IEC international standards). This voltage is fully compatible with existing 380V power grids and equipment, because:
- The voltage at the generator outlet is 5% higher than that of the grid, compensating for the voltage drop in the line
- Upon reaching the user end, the voltage has dropped from 400V to approximately 380V
- 380V equipment can operate normally under a 400V power supply
Q2: What is the difference between voltage 400V/230V and 380V/220V?
A: The two are essentially the same, with only the standard being upgraded.
- Old national standard: 380V/220V (gradually phased out)
- Current standard: 400V/230V (IEC international standard)
Huaquan generators are shipped at 400V/230V, fully compatible with existing power grids and equipment, so there is no need to worry about compatibility issues.
Q3: Can other voltages be customized?
A: Sure. Huaquan low-voltage generator sets can be customized according to export requirements:
- 440V/254V: United States, some North American regions (60Hz)
- 480V/277V: American Industrial Standard (60Hz)
- 415V/240V: Australija, some European countries (50Hz)
- 380V/220V: Specific project requirements
When customizing, it is necessary to specify the output voltage, frekvencija (50Hz/60 Hz), and wiring method.
Q4: Can a 400V generator power a 380V device?
A: Da, it is a design convention for the rated voltage of a generator to be 5% higher than the rated voltage of the load. The reasons are as follows:
- Compensate for the voltage drop along the line from the generator to the load
- The longer the line, the greater the voltage drop, and the generator outlet voltage needs to be increased accordingly
- As long as the voltage deviation of the equipment is within ±10% (which is met by most equipment), it can operate normally
VIII. Summary
The rated output voltage of Huaquan low-voltage generator sets is 400V/230V (three-phase four-wire system), covering the full power range from 30kW to over 2000kW. With stable voltage (AVR control, ±1% accuracy) and insulation level H (resistant to high temperatures up to 180℃), it is the most mainstream voltage level of generator sets in the domestic market.
| core parameters | Huaquan Standard |
| rated voltage | 400V/230V (three-phase four-wire, Y connection) |
| faktor snage | 0.8 (lagging) |
| frekvencija | 50Hz |
| Steady-state voltage regulation | ≤±1% |
| insulation class | H level |
| Protection level | IP22 |
For more technical details or selection advice, please contact Huaquan Power’s customer service
