EN
GDCY-400kV/20kJ Lightning Impulse Voltage Generator
GDCY-400kV/20kJ Digital Intelligent Lightning Impulse Voltage Generator (±400kV Peak, 20kJ Energy) with 4-Stage Marx Circuit, 1.2/50μs Standard Lightning Impulse, Optional 250/2500μs Switching Impulse & 2-5μs Chopped Wave, Computer Control, Digital Waveform Recording, for 110kV Power Transformer, GIS, Bushing, Instrument Transformer, Insulator Impulse Withstand Voltage Test.
- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The GDCY-400kV/20kJ is a professional, compact laboratory-grade lightning impulse voltage test system designed for insulation strength verification of 110kV and below high-voltage electrical equipment under lightning overvoltage conditions. It fully complies with IEC 60060-1:2010 and GB/T 16927.1-2011 standards, adopting the classic 4-stage Marx multiplier circuit to generate high-voltage impulse waveforms with excellent stability and repeatability.
The system consists of a high-voltage DC charging power supply, a 4-stage impulse generator, a 0.2-class standard capacitor divider, an optional pneumatic chopping gap device, and a computer-based control and measurement system.It can generate standard lightning impulse full wave (1.2/50μs) as standard, with optional standard switching impulse wave (250/2500μs) and lightning impulse chopped wave (2-5μs). The voltage utilization coefficient is ≥85% for lightning wave and ≥75% for chopped wave, with peak oscillation <5%. Equipped with a high-speed digital oscilloscope (100MHz bandwidth, 1GS/s sampling rate) and dedicated waveform analysis software, it automatically measures waveform parameters, calculates test results, and generates standardized test reports. With comprehensive safety protection including interlock, over-voltage, and emergency stop, it ensures safe and reliable operation in laboratory environments. Ideal for factory type tests, acceptance tests, and research experiments of 110kV and below power transformers, GIS, bushings, instrument transformers, insulators, and surge arresters.
Specifications
| Parameter | Specification |
|---|---|
| Rated Output Voltage | ±400kV peak (positive/negative polarity switchable) |
| Rated Energy | 20kJ (5kJ per stage) |
| Circuit Structure | 4-stage Marx multiplier circuit |
| Stage Voltage | 100kV per stage |
| Stage Capacitance | 1μF per stage (total 0.25μF) |
| Standard Lightning Impulse | 1.2/50μs (T1±30%, T2±20%) - standard |
| Optional Switching Impulse | 250/2500μs (T1±20%, T2±60%) - optional |
| Optional Lightning Chopped Wave | 2-5μs chopping time, over-zero coefficient 0.25-0.35 - optional |
| Voltage Utilization Coefficient | ≥85% (lightning wave, no load), ≥75% (chopped wave), ≥70% (switching wave) |
| Peak Oscillation | <5% |
| Waveform Repeatability | ≤±1% |
| Charging Voltage Accuracy | ≤±1% |
| Charging Voltage Instability | <±0.5% |
| Synchronous Discharge Range | ≥20% |
| Synchronous Discharge Error Rate | <2% |
| Ignition Range | 10%–100% of rated voltage |
| Measurement System | 100MHz bandwidth, 1GS/s sampling rate digital oscilloscope |
| Control System | Industrial computer + Windows-based dedicated software |
| Test Modes | Automatic test, Manual test, Step boost test |
| Data Management | Unlimited storage, PDF report generation, Excel export |
| Protection Functions | Interlock, Over-voltage, Over-current, Emergency stop, Automatic grounding |
| Working Time | ≥80%Un: 120s/charge-discharge cycle；<80%Un: 60s/charge-discharge cycle |
| Operating Temperature | 5℃ ~ +40℃ |
| Operating Humidity | ≤80%RH (non-condensing) |
| Altitude | ≤1000m |
| Compliance | IEC 60060-1:2010, IEC 60060-2:2010, GB/T 16927.1-2011, DL/T 848.5-2004, IEEE Std 4-2013 |
Applications
Core Test Objects (110kV and Below)
- Power transformers: 35kV-110kV power transformers and distribution transformers
- GIS & gas-insulated switchgear: 35kV-110kV GIS, circuit breakers, disconnectors
- Bushings: 35kV-110kV transformer bushings and wall bushings
- Instrument transformers: 35kV-110kV current transformers (CT) and voltage transformers (VT)
- Insulators: suspension insulators, post insulators, insulator strings
- Surge arresters: 35kV-110kV metal oxide surge arresters
- Power cables: 35kV-110kV XLPE power cables
Typical Usage Scenarios
- Factory type tests: manufacturer factory acceptance tests (FAT) according to IEC and GB standards
- Substation commissioning: new equipment acceptance tests
- Research and development: insulation material performance research and new product development
- Third-party inspection: compliance testing and certification
- Power metrology institutes: calibration and traceability of impulse voltage measuring systems
Advantages
Multiple Impulse Waveforms
Generates standard lightning full wave as standard, with optional switching wave and lightning chopped wave → one system covers most impulse test requirements for 110kV equipment
High Precision & Excellent Repeatability
≤±1% charging accuracy and ≤±1% waveform repeatability → ensures reliable and consistent test results
Fully Automatic Test Process
One-click test execution, automatic waveform recording and analysis → reduces human error, improves test efficiency
Comprehensive Safety Protection
Multiple protection layers + automatic grounding → maximum safety for operators and expensive test equipment
Compact Mobile Design
Split mobile structure with casters for easy transportation and installation → flexible for different laboratory layouts and field use
Cost-Effective Solution
Optimized for 110kV and below equipment, providing excellent performance at a competitive price → ideal for small and medium-sized laboratories and manufacturers
FAQ
Q: What is the principle of lightning impulse voltage generator?
A: It uses the Marx multiplier circuit principle: charge capacitors in parallel at low voltage, then discharge them in series through spark gaps to generate high-voltage lightning impulse waveforms.
Q: What waveforms can GDCY-400kV/20kJ generate?
A: It generates 1.2/50μs standard lightning impulse full wave as standard. Optional waveforms include 250/2500μs standard switching impulse wave and 2-5μs lightning impulse chopped wave, all meeting IEC 60060-1 requirements.
Q: What is the maximum load capacitance it can test?
A: It can test up to 3000pF for lightning impulse wave and up to 10000pF for switching impulse wave, covering most 110kV and below electrical equipment.
Q: Does it support automatic test and report generation?
A: Yes. The computer control system supports fully automatic test procedures, automatically records and analyzes waveforms, calculates test results, and generates standardized PDF test reports.
Q: What safety protection functions does it have?
A: It features interlock protection (generator door and high-voltage area), over-voltage protection, over-current protection, hard-wired emergency stop, and automatic pneumatic grounding after test completion.
