Series Resonance Test Device
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 number | Device name | Specification and model | Unit | Quantity |
1 | Variable frequency power supply | LHV-4kW | Tower | 1 |
2 | Excitation transformer | LHV-4kVA/1.5/3/6kV/0.4kV | Tower | 1 |
3 | High voltage reactor | LHV-25kVA/25kV | Section | 3 |
4 | Capacitive voltage divider | LHV-1000pF/80kV | Set | 1 |
Main technical parameters and functions
Rated capacity | 75kVA |
Rated voltage | 25k;75kV |
Rated current | 3A;1A |
Measurement accuracy | System RMS level 1.5 |
Operating frequency | 30-300Hz |
Device output waveform | Sinusoidal wave |
Quality factor | Device Q≥30(f=45Hz) |
Waveform distortion rate | Output voltage waveform distortion ≤1% |
Input power supply | Single-phase 220 or three-phase 380V voltage, frequency 50Hz |
Working hours | Allow continuous 60min under rated load; Overpressure 1.1 times 1 minute |
Temperature rise | Temperature rise ≤65K after continuous operation under rated load for 60 minutes |
Protection function | Overvoltage, 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 number | Test | Test Frequency | Test Current |
1 | AC 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=36.7H | f=1/2π√(LC)=1/(2×3.14×√(36.7×0.5632×10⁻⁶))=35.01Hz | I=2πfCU=2π×35.01×0.5632×10⁻⁶×22×10³=2.73A |
2 | AC 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=396H | f=1/2π√(LC)=1/(2×3.14×√(396×0.0681×10⁻⁶))=30.65Hz | I=2πfCU=2π×30.65×0.0681×10⁻⁶×52×10³=0.68A |
3 | AC 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=396H | f=1/2π√(LC)=1/(2×3.14×√(396×0.02×10⁻⁶))=55.55Hz | I=2πfCU=2π×55.55×0.02×10⁻⁶×68×10³=0.48A |
Equipment combination method during testing
Test Object | Reactor Selection (25kVA/25kV Three Sections) | Excitation Transformer Output Selection | Test Voltage (kV) |
10kV/300mm2 Cable 1.5km | Use three reactors in parallel | 1.5kV | ≤22kV |
35kV/300mm2 Cable 0.35km | Use three reactors in series | 3kV | ≤52kV |
35kV Transformer Multiple Current Withstand Test | Use three reactors in series | 6kV | ≤68kV |
10kV Switch and Other Electrical Equipment | Use three reactors in series | 3kV | ≤42kV |
System Configuration Parameters
(一) Variable Frequency Power Supply UHV-4kW (1 unit)
Rated Output Capacity | 4kW |
Power Supply | 220/380±10%V (Single/Three Phase), Power Frequency |
Output Voltage | 0-400V |
Rated Input Current | 10A |
Rated Output Current | 10A |
Voltage Resolution | 0.01kV |
Voltage Measurement Accuracy | 1.5% |
Frequency Adjustment Range | 30-300Hz |
Frequency Adjustment Resolution | ≤0.1Hz |
Frequency Stability | 0.1% |
Operating Time | Continuous 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 |
Weight | Approximately 10kg |
(二) Excitation Transformer UHV-4kVA/1.5/3/6kV/0.4kV (1 unit)
Rated Capacity | 4kVA |
Input Voltage | 0-400V |
Output Voltage | 1.5/3/6kV |
Structure | Dry Type |
Dimensions (L×W×H mm) | 450×330×430 |
Weight | Approximately 45kg |
(三) High Voltage Reactor UHV-25kVA/25kV (3 units)
Rated Capacity | 25kVA |
Rated Voltage | 25kV |
Rated Current | 1A |
Inductance | 110H/unit |
Quality Factor | Q≥30(f=45Hz) |
Structure | Dry Type |
Dimensions (Inner Diameter×Height mm) | 282×435 |
Weight | Approximately 45kg |
(四) Capacitive Voltage Divider UHV-1000pF/80kV (1 set)
Rated Voltage | 80kV |
High Voltage Capacitance | 1000pF |
Dielectric Loss | tgσ≤0.5% |
Voltage Division Ratio | 1000:1 |
Measurement Accuracy | Effective Value 1.5 Grade |
Dimensions (Inner Diameter×Height mm) | 140×1000 |
Weight | Approximately 8kg |
Delivery List
No. | Equipment Name | Model and Specifications | Unit | Quantity |
1 | Variable Frequency Power Supply | LHV-4kW | Unit | 1 |
2 | Excitation Transformer | LHV-4kVA/1.5/3/6kV/0.4kV | Unit | 1 |
3 | High Voltage Reactor | LHV-25kVA/25kV | Section | 3 |
4 | Capacitive Voltage Divider | LHV-1000pF/80kV | Set | 1 |
5 | Internal Connection Cables | Set | 1 | |
6 | Factory Inspection Report | Copy | 1 | |
7 | User Manual | Copy | 1 | |
8 | Product Certificate | Copy | 1 | |
9 | Packing List | Copy | 1 |
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
Parameter | Specification |
---|---|
Rated Capacity | 75kVA |
Output Voltage | 0-75kV AC |
Frequency Range | 30-300Hz (45-65Hz optimized) |
Waveform Distortion | THD ≤3% |
Protection Class | IP54 (field deployment) |
Standard Test Applications
1. Cable Testing
Cable Type | Length | Capacitance | Test Voltage | Duration |
---|---|---|---|---|
10kV/300mm² | 1.5km | ≤0.5632μF | 22kV | 5min |
35kV/300mm² | 0.35km | ≤0.0681μF | 52kV | 60min |
2. Electrical Equipment Testing
Equipment | Capacitance | Test Voltage | Duration |
---|---|---|---|
35kV Transformer | ≤0.02μF | ≤68kV | 1min |
10kV Switchgear | - | ≤42kV | 1min |
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):
Connect resonant reactor in parallel configuration
Set frequency to 45Hz ±5%
Ramp voltage to 22kV over 60 seconds
Maintain for 5 minutes while monitoring leakage current