EN
- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The GDFR-C5-1200kV is a national-grade traceable impulse voltage standard designed for accurate measurement of lightning impulse (1.2/50μs) and switching impulse (250/2500μs) voltages in 750kV and below extra-high-voltage (EHV) laboratories, power equipment manufacturers, and on-site substation tests. It fully complies with DL/T 846.1-2016 and IEC 60060-2:2010, adopting three-stage series-connected high-voltage pulse capacitors and integrated multistage distributed damping resistors to achieve excellent step response characteristics and minimal waveform distortion, ensuring true reproduction of fast transient impulse waveforms.
The system consists of a heavy-duty oil-immersed divider unit with a double-layer stainless steel grading ring and a low-voltage interface compatible with all mainstream impulse analyzers and oscilloscopes, with a standard 10000:1 voltage divider ratio (custom ratios available). It features ≤5pC partial discharge at rated voltage and ≤0.3% annual ratio stability, making it suitable for both impulse withstand voltage tests of EHV equipment and traceable calibration of impulse voltage generators. With a heavy-duty mobile base with locking casters and high-purity epoxy glass fiber insulation cylinder, it is ideal for laboratory and on-site testing of 750kV GIS, power transformers, zinc oxide arresters (MOA), and insulators.
Specifications
|
Parameter |
Specification |
|
Rated Lightning Impulse Voltage |
±1200kV (peak) |
|
Rated Switching Impulse Voltage |
±1200kV (peak) |
|
High-Voltage Arm Capacitance |
300pF ±2% |
|
Low-Voltage Arm Capacitance |
3μF ±0.5% |
|
Standard Voltage Divider Ratio |
10000:1 (custom ratios available) |
|
Step Response Time (Tₐ) |
≤80ns |
|
Overshoot (β) |
≤5% |
|
Partial Response Time |
≤60ns |
|
Frequency Response |
DC to 15MHz (flat within ±0.5%) |
|
Measurement Accuracy |
±0.5% (peak) |
|
Annual Ratio Stability |
≤±0.3% |
|
Temperature Coefficient |
≤30ppm/°C |
|
Linearity Error |
≤±0.3% |
|
Partial Discharge Level |
≤5pC at 1200kV |
|
Dielectric Loss Tangent (tgδ) |
≤0.08% at 50Hz |
|
Output Interface |
BNC 75Ω shielded connector |
|
Insulation Material |
High-purity epoxy glass fiber reinforced plastic |
|
Sealing Structure |
Oil-immersed fully sealed |
|
Grading Ring |
Double-layer stainless steel |
|
Base Type |
Heavy-duty steel mobile base with 4 locking casters |
|
Dimensions (mm) |
Φ550×3800 (including grading ring) |
|
Weight |
~120kg |
|
Operating Temperature |
-10°C ~ +40°C；Humidity ≤85%RH (non-condensing) |
|
Compliance |
DL/T 846.1-2016, GB/T 16927.2-2013, IEC 60060-2:2010, IEC 61083-2 |
Applications
Core Test Objects
- Impulse voltage generators: traceable calibration of output waveform and amplitude
- 750kV GIS: lightning impulse withstand voltage test (LI) and switching impulse test (SI)
- 750kV power transformers: full-wave and chopped-wave impulse withstand tests
- Zinc oxide arresters (MOA): lightning impulse residual voltage test
- EHV insulators & bushings: lightning impulse flashover voltage test
- High-voltage cables: impulse voltage test
Typical Usage Scenarios
- Laboratory calibration: national/regional metrology institute impulse standard
- Manufacturing quality control: production line testing of 750kV EHV equipment
- On-site substation commissioning: EHV equipment acceptance tests
- Research & development: ultra-high voltage insulation research and transient measurement
- Compliance inspection: meets DL/T 846.1 and IEC 60060-2 standards
Advantages
≤80ns Step Response & ≤5% Overshoot
Industry-leading waveform fidelity；true reproduction of fast impulse transients → accurate measurement of critical EHV equipment insulation performance
±0.5% High Accuracy & ≤0.3% Annual Stability
National-grade traceable standard；long-term measurement reliability → ensures test result validity and regulatory compliance
Multistage Distributed Damping
Eliminates internal oscillations and waveform distortion；flat frequency response up to 15MHz → excellent performance for both lightning and switching impulses
Oil-Immersed Fully Sealed Structure
≤5pC ultra-low partial discharge；anti-moisture, anti-corona, long service life → suitable for harsh field and laboratory environments
Heavy-Duty Mobile Base with Locking Casters
Easy to move and fix on site；robust design for industrial use → improves testing efficiency and safety
FAQ
Q: Can it measure both lightning and switching impulse voltages?
A: Yes. It is designed for 1.2/50μs lightning impulse and 250/2500μs switching impulse voltage measurement, with excellent performance for both waveforms.
Q: What is the step response time and overshoot?
A: ≤80ns step response time and ≤5% overshoot, meeting IEC 61083-2 Class 1 requirements, which is the highest accuracy class for impulse dividers.
Q: Is it suitable for calibrating impulse voltage generators?
A: Yes. ±0.5% accuracy and ≤0.3% annual stability make it a national-grade traceable standard for impulse voltage generator calibration.
