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Series Resonance Test Device

LHV(L) Power Frequency Series Resonant Test System for Hydrogenerator AC Withstand Testing

High-capacity power frequency resonant test system for 250MW hydrogenerators. Features <1% THD, automatic arc quenching, and 90% smaller power supply requirements vs traditional methods.


  • US$1.00; Negotiated Price
  • Lead time: 90days

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Product Details

Product Tags

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 voltage0 ~ 60kV(AC RMS) and below
output frequency50Hz
Resonance voltage waveformPure sine wave, waveform distortion rate ≤1%
Work systemFull power conticontrol consolenuous working time of 1min
quality factor10~40
Maximum test capacity3000kVA and below
Working power supply380V±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 modelcontrol consoleVoltage regulatorreactor(dry)Excitation transformer(dry)Voltage dividerScope of application
UHV(L)- 200kVA/25kV30kW30kVA(electric)200kVA/25kV Adjustable one30kVA dry30kVhydrodynamo.0.4~1.0μF.(10kV/40MW)
UHV(L)- 300kVA/50kV60kW60kVA(electric)300kVA/50kV Adjustable one60kVA oil-immersed50kVThermal generator.0.27~0.33μF.(20kV/300MW)
UHV(L)- 600kVA/50kV60kW60kVA(electric)200kVA/50kV Adjustable one
400kVA/50kV Adjustable one
60kVA oil-immersed50kVThermal generator.0.113~0.45μF.(20kV/600MW)
UHV(L)- 1200kVA/50kV120kW120kVA(induction)200kVA/50kV Fixed two
800kVA/50kV Adjustable one
120kVA oil-immersed50kVhydrodynamo.0.6~1.8μF.(20kV/250MW)
UHV(L)- 2750kVA/55kV300kW300kVA(induction)750kVA/55kV Fixed two
1250kVA/55kV Adjustable one
120kVA oil-immersed60kVhydrodynamo.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

hydrodynamoRated Capacity(WM)rated voltage(kV)Phase capacitor(μF)
72.5~8510.50.694
125~150/1.8~1.9
30015.751.7~2.5
40018.02~2.5
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

ParameterTraditional Test TransformerLHV(L) Resonant System
Input Power Requirement100% of test capacity<10% (Q>10)
Waveform THD3-5% typical<1% guaranteed
Weight for 250MW Test8-12 tons1-2 tons
Flashover ResponseManual interventionAuto-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

  1. Requires only 220V/380V site power

  2. No large cooling systems needed

  3. 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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