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Series Resonance Test Device

LHV-75kVA/75kV AC Resonant Test System for Cable & Transformer Testing

Professional LHV-75kVA/75kV resonant test system for large capacity HV testing. Complies with GB 50150-2016 standards, features DSP technology, and lightweight field operation.


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

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Product Details

Product Tags

LHV-75kVA/75kV AC Resonant Test System for High Voltage Applications

Product Introduction

The LHV-75kVA/75kV AC Resonant Test System is engineered for preventive testing and quality assurance of high-voltage electrical equipment. Utilizing advanced DSP platform technology, this lightweight solution meets stringent Chinese standards including GB 50150-2016 and DL/T 849.6-2016 for field testing applications.

Main components of the device

Serial numberDevice nameSpecification and modelUnitQuantity
1Variable frequency power supplyLHV-4kWTower1
2Excitation transformerLHV-4kVA/1.5/3/6kV/0.4kVTower1
3High voltage reactorLHV-25kVA/25kVSection3
4Capacitive voltage dividerLHV-1000pF/80kVSet1

Main technical parameters and functions

Rated capacity75kVA
Rated voltage25k;75kV
Rated current3A;1A
Measurement accuracySystem RMS level 1.5
Operating frequency30-300Hz
Device output waveformSinusoidal wave
Quality factorDevice Q≥30(f=45Hz)
Waveform distortion rateOutput voltage waveform distortion ≤1%
Input power supplySingle-phase 220 or three-phase 380V voltage, frequency 50Hz
Working hoursAllow continuous 60min under rated load; Overpressure 1.1 times 1 minute
Temperature riseTemperature rise ≤65K after continuous operation under rated load for 60 minutes
Protection functionOvervoltage, overcurrent, zero start, system mismatch (flashover) and other protection functions
Ambient temperature-20℃-55℃
Relative humidity≤90%RH
Altitude≤3000m

Device capacity verification (device capacity is 75kVA, divided into three reactors, reactor single section is 25kVA/25kV/1A/110H)

Serial numberTestTest FrequencyTest Current
1AC withstand voltage test for 10kV/300mm² cable 1.5km, capacitance ≤0.5632μF, test frequency 30-300Hz, test voltage 22kV, test time 5min, using three reactors in parallel, then L=110/3=36.7Hf=1/2π√(LC)=1/(2×3.14×√(36.7×0.5632×10⁻⁶))=35.01HzI=2πfCU=2π×35.01×0.5632×10⁻⁶×22×10³=2.73A
2AC withstand voltage test for 35kV/300mm² cable 0.35km, capacitance ≤0.0681μF, test frequency 30-300Hz, test voltage 52kV, test time 60min, using three reactors in series (mutual inductance coefficient 1.2), L=110×3×1.2=396Hf=1/2π√(LC)=1/(2×3.14×√(396×0.0681×10⁻⁶))=30.65HzI=2πfCU=2π×30.65×0.0681×10⁻⁶×52×10³=0.68A
3AC withstand voltage test for 35kV main control, capacitance ≤0.02μF, test frequency 45-65Hz, test voltage not exceeding 68kV, test time 1min, using three reactors in series (mutual inductance coefficient 1.2), then L=110×3×1.2=396Hf=1/2π√(LC)=1/(2×3.14×√(396×0.02×10⁻⁶))=55.55HzI=2πfCU=2π×55.55×0.02×10⁻⁶×68×10³=0.48A

Equipment combination method during testing

Test Object
Combination Method

Reactor Selection
(25kVA/25kV Three Sections)
Excitation Transformer
Output Selection
Test Voltage
(kV)
10kV/300mm2
Cable 1.5km
Use three reactors in parallel1.5kV≤22kV
35kV/300mm2
Cable 0.35km
Use three reactors in series3kV≤52kV
35kV Transformer Multiple Current Withstand TestUse three reactors in series6kV≤68kV
10kV Switch and Other Electrical EquipmentUse three reactors in series3kV≤42kV

System Configuration Parameters

(一) Variable Frequency Power Supply UHV-4kW (1 unit)

Rated Output Capacity4kW
Power Supply220/380±10%V (Single/Three Phase), Power Frequency
Output Voltage0-400V
Rated Input Current10A
Rated Output Current10A
Voltage Resolution0.01kV
Voltage Measurement Accuracy1.5%
Frequency Adjustment Range30-300Hz
Frequency Adjustment Resolution≤0.1Hz
Frequency Stability0.1%
Operating TimeContinuous 60min at Rated Capacity
Maximum Component Temperature at Continuous 60min Operation at Rated Capacity≤65K
Noise Level≤50dB
Dimensions (L×W×H mm)400×280×400
WeightApproximately 10kg

(二) Excitation Transformer UHV-4kVA/1.5/3/6kV/0.4kV (1 unit)

Rated Capacity4kVA
Input Voltage0-400V
Output Voltage1.5/3/6kV
StructureDry Type
Dimensions (L×W×H mm)450×330×430
WeightApproximately 45kg

(三) High Voltage Reactor UHV-25kVA/25kV (3 units)

Rated Capacity25kVA
Rated Voltage25kV
Rated Current1A
Inductance110H/unit
Quality FactorQ≥30(f=45Hz)
StructureDry Type
Dimensions (Inner Diameter×Height mm)282×435
WeightApproximately 45kg

(四) Capacitive Voltage Divider UHV-1000pF/80kV (1 set)

Rated Voltage80kV
High Voltage Capacitance1000pF
Dielectric Losstgσ≤0.5%
Voltage Division Ratio1000:1
Measurement AccuracyEffective Value 1.5 Grade
Dimensions (Inner Diameter×Height mm)140×1000
WeightApproximately 8kg

Delivery List

No.Equipment NameModel and SpecificationsUnitQuantity
1Variable Frequency Power SupplyLHV-4kWUnit1
2Excitation TransformerLHV-4kVA/1.5/3/6kV/0.4kVUnit1
3High Voltage ReactorLHV-25kVA/25kVSection3
4Capacitive Voltage DividerLHV-1000pF/80kVSet1
5Internal Connection Cables
Set1
6Factory Inspection Report
Copy1
7User Manual
Copy1
8Product Certificate
Copy1
9Packing List
Copy1

Reference Test Standards

DL/T 596-1996"Preventive Test Code for Electric Power Equipment"
GB50150-2016"Standard for Handover Testing of Electrical Equipment in Electrical Installation Engineering"
GB10229-88"Reactors"
GB1094"Power Transformers"
GB1094.1-GB1094.6-96"Degrees of Protection Provided by Enclosures"
GB2900"Electrotechnical Terminology"
GB/T16927.1~2-1997"High Voltage Test Techniques"
DL/T474.4-2006"Guide for Insulation Test Implementation on Site - AC Withstand Voltage Test"
DL/T1015"Guide for the Use of Voltage Measurement Systems for On-site DC and AC Withstand Voltage Tests"
GB/T311.1-1997"Insulation Coordination and Insulation of High Voltage Power Transmission and Transformation Equipment"
GB191-2000"Pictorial Markings for Packaging and Storage"
JB/T9641-1999"Test Transformers"
IEC358(1990)"Coupling Capacitors and Capacitor Dividers"
GB4793-1984"Safety Requirements for Electronic Measuring Instruments"
GB/T3859.2-1993"Application Guide for Semiconductor Converters"
GB/T2423.8-1995"Basic Environmental Testing Procedures for Electrical and Electronic Products"
DL/T849.6-2004"General Technical Specifications for Special Test Instruments for Power Equipment Part 6: High Voltage Frequency Tuning Test Devices"

Core Features:

  • 75kVA/75kV testing capacity

  • DSP-controlled precision measurement

  • Multi-stage protection (overvoltage, overcurrent, flashover)

  • 30-300Hz adjustable test frequency

  • Field-portable design

Technical Specifications

ParameterSpecification
Rated Capacity75kVA
Output Voltage0-75kV AC
Frequency Range30-300Hz (45-65Hz optimized)
Waveform DistortionTHD ≤3%
Protection ClassIP54 (field deployment)

Standard Test Applications

1. Cable Testing

Cable TypeLengthCapacitanceTest VoltageDuration
10kV/300mm²1.5km≤0.5632μF22kV5min
35kV/300mm²0.35km≤0.0681μF52kV60min

2. Electrical Equipment Testing

EquipmentCapacitanceTest VoltageDuration
35kV Transformer≤0.02μF≤68kV1min
10kV Switchgear-≤42kV1min

Safety Protection System

Comprehensive safeguards ensure operator and equipment protection:

  • Overvoltage Protection: Automatic shutdown at 110% rated voltage

  • Overcurrent Protection: Current limiting at 120% rated value

  • Zero-start Interlock: Prevents improper energization

  • System Mismatch Detection: Instant response to flashover events

  • Emergency Stop: Manual override capability

Compliance Standards

  • GB 50150-2016: Electrical equipment handover standards

  • DL/T 849.6-2016: Special technical conditions for resonant test devices

  • DL/T 474.4-2018: Preventive test procedures for power equipment

Field Operation Advantages

Weight Reduction

60% lighter than conventional test transformers of equivalent capacity

Power Efficiency

Requires only 20-30% of the power needed by traditional methods

Quick Deployment

Modular components enable setup in under 30 minutes

Typical Test Configurations

For 10kV Cable Testing (1.5km):

  1. Connect resonant reactor in parallel configuration

  2. Set frequency to 45Hz ±5%

  3. Ramp voltage to 22kV over 60 seconds

  4. Maintain for 5 minutes while monitoring leakage current

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