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 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