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- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The GDFR-C2-900H is a high-precision, low-partial-discharge AC-only capacitive voltage divider designed for accurate measurement of power frequency and variable frequency AC high voltages in 500kV–750kV substations, high-voltage laboratories, and power equipment manufacturers. It fully complies with DL/T 846.1-2016 and GB/T 16927.2-2013, adopting a balanced equipotential shielding structure and fully sealed imported polyurethane foaming filling to minimize leakage current, electromagnetic interference, and internal partial discharge, ensuring stable and accurate measurements in harsh field and laboratory environments.
The system consists of a heavy-duty high-voltage divider unit with a double-layer stainless steel grading ring and a portable digital display meter/oscilloscope interface, with a standard 10000:1 voltage divider ratio (custom ratios available). It features ≤5pC ultra-low partial discharge at rated voltage, making it suitable for both AC withstand voltage tests and partial discharge (PD) tests of extra-high-voltage (EHV) equipment. With a heavy-duty mobile base with locking casters and high-purity epoxy glass fiber insulation cylinder, it is ideal for on-site and laboratory testing of 500kV–750kV GIS, power transformers, XLPE power cables, and switchgear.
Specifications
|
Parameter |
Specification |
|
Rated Power Frequency AC Voltage |
900kV (RMS) |
|
Rated Lightning Impulse Voltage |
2000kV (peak) |
|
High-Voltage Arm Capacitance |
200pF ±2% |
|
Low-Voltage Arm Capacitance |
2μF ±0.5% |
|
Standard Voltage Divider Ratio |
10000:1 (custom ratios available) |
|
Operating Frequency Range |
30Hz–300Hz |
|
Frequency Response Error |
≤±0.3% (30–300Hz) |
|
Partial Discharge Level |
≤5pC at 900kV |
|
Dielectric Loss Tangent (tgδ) |
≤0.08% at 50Hz |
|
Measurement Accuracy |
AC ±0.5% (RMS)；±1.0% (peak) |
|
Annual Ratio Stability |
≤±0.3% |
|
Temperature Coefficient |
≤30ppm/°C |
|
Linearity Error |
≤±0.3% |
|
Output Interface |
BNC 75Ω shielded connector |
|
Insulation Material |
High-purity epoxy glass fiber reinforced plastic |
|
Filling Medium |
Imported polyurethane foaming agent (fully sealed) |
|
Grading Ring |
Double-layer stainless steel |
|
Base Type |
Heavy-duty steel mobile base with 4 locking casters |
|
Dimensions (mm) |
Φ500×3200 (including grading ring) |
|
Weight |
~85kg |
|
Operating Temperature |
-10°C ~ +40°C；Humidity ≤85%RH (non-condensing) |
|
Altitude |
≤2000m (customizable) |
|
Compliance |
DL/T 846.1-2016, GB/T 16927.2-2013, IEC 60060-1, IEC 61083-2 |
Applications
Core Test Objects
- 500kV–750kV GIS: AC withstand voltage test and partial discharge test
- 500kV–750kV power transformers: power frequency AC withstand voltage test
- 500kV XLPE power cables: AC withstand voltage test (with series resonant systems)
- EHV switchgear & bushings: power frequency flashover voltage test
- High-voltage insulators: power frequency withstand voltage test
- AC withstand test systems: voltage measurement and feedback control
Typical Usage Scenarios
- On-site substation commissioning: EHV equipment acceptance tests
- Manufacturing quality control: production line testing of EHV power equipment
- High-voltage laboratory calibration: traceable calibration of AC test systems
- Research & development: EHV insulation research and variable frequency measurement
- Compliance inspection: meets DL/T 846.1 and IEC 60060-1 standards
Advantages
0.5% Ultra-High Accuracy & ≤0.3% Annual Stability
Industry-leading precision and long-term stability → reliable traceable measurements for EHV equipment
≤5pC Ultra-Low Partial Discharge
Enables simultaneous AC withstand and PD tests with one divider → eliminates need for separate PD couplers, saves cost and time
30–300Hz Wide Frequency Response
Optimized for both power frequency and variable frequency series resonant tests → one unit for all EHV AC test scenarios
Balanced Equipotential Shielding
Eliminates leakage current and EMI → accurate readings in strong 500kV–750kV substation environments
Heavy-Duty Mobile Base with Locking Casters
Easy to move and fix on site；robust design for harsh industrial environments → improves testing efficiency and safety
FAQ
Q: Is it an AC-only divider or AC/DC dual-purpose?
A: It is an AC-only capacitive divider optimized for power frequency and variable frequency AC high voltage measurement.
Q: What is the partial discharge level at rated voltage?
A: ≤5pC at 900kV, which meets the strict PD test requirements for 500kV–750kV EHV equipment.
Q: Can it be used with variable frequency series resonant test systems?
A: Yes. 30–300Hz wide frequency response with ≤±0.3% error makes it ideal for series resonant tests.
Q: Is it portable for on-site substation use?
A: Yes. It is equipped with a heavy-duty mobile base with locking casters, making it easy to move and fix on site.
