Series Resonance Test Device
LHV(L) Power Frequency Resonant Test System for Large Hydrogenerators
Revolutionizing High-Capacity Generator Testing
This power frequency series resonance system solves the critical challenges in testing hydrogenerators up to 250MW capacity:
90% reduction in required input power vs conventional test transformers
Ultra-clean output waveform (<1% THD)
Automatic arc quenching during flashover events
Compact design vs traditional multi-ton test setups
Product Parameters
Technical parameters
| Rated output voltage | 0 ~ 60kV(AC RMS) and below |
| output frequency | 50Hz |
| Resonance voltage waveform | Pure sine wave, waveform distortion rate ≤1% |
| Work system | Full power conticontrol consolenuous working time of 1min |
| quality factor | 10～40 |
| Maximum test capacity | 3000kVA and below |
| Working power supply | 380V±15%、Power frequency 50Hz |
Serial product configuration(Scope of application(Ac withstand voltage test for generator or motor with outlet voltage of 20kV or below, test frequency: 50Hz))
| Product model | control console | Voltage regulator | reactor(dry) | Excitation transformer(dry) | Voltage divider | Scope of application |
| UHV(L)- 200kVA/25kV | 30kW | 30kVA(electric) | 200kVA/25kV Adjustable one | 30kVA dry | 30kV | hydrodynamo.0.4～1.0μF.(10kV/40MW) |
| UHV(L)- 300kVA/50kV | 60kW | 60kVA(electric) | 300kVA/50kV Adjustable one | 60kVA oil-immersed | 50kV | Thermal generator.0.27～0.33μF.(20kV/300MW) |
| UHV(L)- 600kVA/50kV | 60kW | 60kVA(electric) | 200kVA/50kV Adjustable one 400kVA/50kV Adjustable one | 60kVA oil-immersed | 50kV | Thermal generator.0.113～0.45μF.(20kV/600MW) |
| UHV(L)- 1200kVA/50kV | 120kW | 120kVA(induction) | 200kVA/50kV Fixed two 800kVA/50kV Adjustable one | 120kVA oil-immersed | 50kV | hydrodynamo.0.6～1.8μF.(20kV/250MW) |
| UHV(L)- 2750kVA/55kV | 300kW | 300kVA(induction) | 750kVA/55kV Fixed two 1250kVA/55kV Adjustable one | 120kVA oil-immersed | 60kV | hydrodynamo.1.6～3.3μF.(20kV/770MW) |
Note: the solution can be customized according to the parameters of test objects
Capacitance of the power system commonly used hydrodynamo reference table
| hydrodynamo | Rated Capacity(WM) | rated voltage(kV) | Phase capacitor(μF) |
| 72.5～85 | 10.5 | 0.694 | |
| 125～150 | / | 1.8～1.9 | |
| 300 | 15.75 | 1.7～2.5 | |
| 400 | 18.0 | 2～2.5 | |
| 600 | / | 2.1～2.5 |
Core Technical Innovations
Waveform Purity
THD <1% - Superior to all existing AC withstand equipment
Fundamental current filtering - Eliminates harmonic distortion
Safety Mechanisms
Automatic arc extinction - Within 1 cycle of flashover
Fault current limitation - Reduces to <10% of test current during breakdown
No voltage overshoot during recovery
System Comparison
| Parameter | Traditional Test Transformer | LHV(L) Resonant System |
|---|---|---|
| Input Power Requirement | 100% of test capacity | <10% (Q>10) |
| Waveform THD | 3-5% typical | <1% guaranteed |
| Weight for 250MW Test | 8-12 tons | 1-2 tons |
| Flashover Response | Manual intervention | Auto-quenching in <20ms |
Typical Test Applications
Hydrogenerator Testing
Stator winding AC withstand tests
Routine maintenance at 1.5× rated voltage
Commissioning tests for new installations
System Advantages
Requires only 220V/380V site power
No large cooling systems needed
Fully compliant with IEEE Std 95-2002
Technical Specifications
Test Capacity: Up to 250MW hydrogenerators
Frequency Range: 45-65Hz (power frequency)
Q Factor: ≥10 (typically 15-20)
Voltage Accuracy: ±0.5% of set value
Safety Standards: IEC 60060-1, IEEE Std 433
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