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- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The GDFR-300kV/300pF is a high-precision, high-bandwidth weakly damped capacitive voltage divider designed for accurate measurement and calibration of lightning impulse (1.2/50μs) and switching impulse (250/2500μs) voltages in high-voltage laboratories, power equipment manufacturers, and research institutions. It fully complies with DL/T 846.1-2016, GB/T 16927.2-2013, and IEC 60060-2, adopting multistage series-connected impulse capacitors and distributed damping resistors to achieve excellent step response characteristics and minimize waveform distortion.
The system consists of a high-voltage divider unit with a stainless steel grading ring and a low-voltage digital display/oscilloscope interface, with a standard 1000:1 voltage divider ratio (2000:1 optional). It can be used as a traceable impulse voltage standard to calibrate impulse voltage generators, or directly measure impulse voltages during zinc oxide arrester (MOA) impulse residual voltage tests, transformer impulse withstand tests, and insulator flashover tests. With a heavy-duty mobile base with locking casters and epoxy glass fiber insulation cylinder, it is suitable for both laboratory calibration and on-site field testing.
Specifications
|
Parameter |
Specification |
|
Rated Lightning Impulse Voltage |
300kV (peak, positive/negative polarity) |
|
Rated Switching Impulse Voltage |
210kV (peak) |
|
High-Voltage Arm Capacitance |
300pF ±5% |
|
Low-Voltage Arm Capacitance |
300nF ±1% |
|
Standard Voltage Divider Ratio |
1000:1 (2000:1 optional) |
|
Step Response Time (Tₐ) |
≤100ns |
|
Overshoot (β) |
≤10% |
|
Partial Response Time |
≤80ns |
|
Ratio Accuracy |
±1% |
|
Annual Ratio Stability |
≤±0.5% |
|
Temperature Coefficient |
≤50ppm/°C |
|
Linearity Error |
≤±0.5% |
|
Partial Discharge |
≤10pC at 300kV |
|
Output Interface |
BNC shielded connector |
|
Insulation Material |
Epoxy glass fiber reinforced plastic |
|
Grading Ring Material |
Stainless steel |
|
Base Type |
Heavy-duty steel mobile base with 4 locking casters |
|
Dimensions (mm) |
Φ400×1800 (including grading ring) |
|
Weight |
~45kg |
|
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, IEC 61083-2 |
Applications
Core Test Objects
- Impulse voltage generators: calibration of output voltage waveform and amplitude
- Zinc oxide arresters (MOA): lightning impulse residual voltage test
- Power transformers: lightning impulse withstand voltage test (LI) and switching impulse test (SI)
- Insulators: lightning impulse flashover voltage test
- Switchgear & GIS: impulse withstand voltage test
- High-voltage cables: impulse voltage test
Typical Usage Scenarios
- Laboratory calibration: traceable calibration of impulse voltage measurement systems
- Manufacturing quality control: production line testing of power equipment
- Research & development: high-voltage insulation research and transient measurement
- On-site testing: field impulse testing of substation equipment
- Compliance inspection: meets DL/T 846.1 and IEC 60060-2 standards
Advantages
≤100ns Step Response & ≤10% Overshoot
Excellent waveform fidelity；accurate measurement of fast impulse transients → reliable test results for critical equipment
Multistage Distributed Damping
Eliminates oscillation and distortion；flat frequency response up to 10MHz → true reproduction of impulse waveforms
±1% Accuracy & ≤0.5%/Year Stability
High precision and long-term stability → reliable traceable measurements
Mobile Base with Locking Casters
Easy to move and fix；suitable for both lab and field use → improves testing efficiency
Compliance with International Standards
Fully meets DL/T 846.1, GB/T 16927.2, and IEC 60060-2 → ensures regulatory compliance
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.
Q: What is the step response time and overshoot?
A: ≤100ns step response time and ≤10% overshoot, meeting IEC 61083-2 Class 2 requirements.
Q: Is it portable for field use?
A: Yes. It is equipped with a heavy-duty mobile base with locking casters, making it easy to move and fix on site.
Q: Can it be used to calibrate impulse voltage generators?
A: Yes. ±1% accuracy and ≤0.5%/year stability make it suitable for traceable calibration of impulse voltage generators.
