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- Description
- Specifications
- Applications
- Advantages
- FAQ
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Description
The GDZG-500-120kV/5mA is a high-power, high-precision intelligent DC high voltage generator optimized for DC withstand voltage test and leakage current measurement of 10kV–110kV long-distance power cables and large-capacity electrical equipment in substations, power plants, and industrial sites. It fully complies with DL/T 848.1-2004 and DL/T 474.2-2006, adopting 30–50kHz high-frequency voltage doubler circuit and PWM pulse width modulation technology with high-power IGBT devices, delivering stable output, low ripple coefficient, and high measurement accuracy.
The system consists of a portable control box and a lightweight voltage doubling cylinder, featuring full-range smooth voltage regulation, zero-start protection, and one-key 75%UDC1mA function (≤0.5% switching error) for fast and accurate zinc oxide arrester (MOA) testing. Equipped with high-precision digital voltage and current meters, it simultaneously displays output voltage, leakage current, and test time in real time. With comprehensive over-voltage, over-current, short-circuit, zero-position, and ground detection protection, it ensures safe operation for both the operator and the test sample. Ideal for commissioning, periodic maintenance, and fault diagnosis of 10kV–110kV long power cables, transformers, generators, switchgear, and lightning arresters.
Specifications
|
Parameter |
Specification |
|
Rated Output Voltage |
120kV DC (negative polarity, zero-start linear adjustable) |
|
Rated Output Current |
5mA DC |
|
Output Power |
600W |
|
Voltage Measurement Accuracy |
±(1.0% reading + 0.1kV)；resolution 0.1kV |
|
Current Measurement Accuracy |
±(1.0% reading + 1 digit)；resolution 0.1μA |
|
Ripple Coefficient |
≤1.0% |
|
Voltage Stability |
≤1.0% (power supply ±10% fluctuation) |
|
75%UDC1mA Switching Error |
≤0.5% |
|
Overload Capacity |
1.25× rated current (short time)；1.1× rated voltage (10min no-load) |
|
Special Function |
One-key 75%UDC1mA MOA test |
|
Test Modes |
Manual, Automatic, MOA Automatic, Step Test |
|
Timing Function |
0–9999s adjustable；audible alarm |
|
Protection |
Zero-start, Over-voltage, Over-current, Short-circuit, Ground detection |
|
Power Supply |
AC220V±10%, 50Hz |
|
Operating Temperature |
-10°C ~ +40°C；Humidity ≤85%RH (non-condensing) |
|
Dimensions (mm) |
Control box: 320×280×180；Voltage doubling cylinder: Φ110×720 |
|
Weight |
Control box: ~8kg；Voltage doubling cylinder: ~6.5kg |
|
Compliance |
DL/T 848.1-2004, DL/T 474.2-2006, IEC 61010-1 CAT III 1000V |
Applications
Core Test Objects
- Long power cables: 10kV–110kV XLPE/PVC insulated cables (10km–20km+ length)
- Power transformers: 10kV–110kV winding insulation resistance and leakage current
- Generators/motors: high-voltage winding DC withstand voltage test
- Lightning arresters: zinc oxide (MOA) and magnetic blow arresters (75%UDC1mA test)
- Switchgear: GIS, vacuum breakers, insulators, bushings
- Large capacitors: high-voltage power capacitor insulation test
Typical Usage Scenarios
- Preventive maintenance: periodic DC hipot test of 10kV–110kV long cables
- Commissioning: new long-distance cable insulation verification before put into operation
- Fault diagnosis: insulation degradation, moisture ingress, or damage detection
- Field testing: portable design for on-site substation and power plant use
- Compliance inspection: meets DL/T 848.1 and power industry safety standards
Advantages
120kV/5mA High Power (600W)
Highest current in 120kV class；stable output for 20km+ 110kV long cables → no voltage drop, accurate leakage measurement
≤0.5% 75%UDC1mA Switching Error
Industry-leading accuracy；exceeds DL/T 848.1 standard → more reliable MOA test results
High-Frequency PWM + Low Ripple
30–50kHz technology；≤1.0% ripple coefficient → precise insulation condition assessment
Comprehensive Protection System
Zero-start + over-voltage + over-current + short-circuit + ground detection → maximum safety for operator and equipment
FAQ
Q: What's the difference between GDZG-500-120/5 and GDZG-700-120/3?
A: GDZG-500-120/5 has 5mA higher current (vs 3mA) and 600W higher power (vs 360W), ideal for 110kV 10km+ long cables；GDZG-700-120/3 is lighter for general 110kV equipment.
Q: Can it test 110kV 20km long XLPE cables?
A: Yes. 5mA high current and 600W power ensure stable output for long capacitive cables.
Q: What's the accuracy of the 75%UDC1mA function?
A: ≤0.5% switching error, which is higher than the industry standard 1.0%.
Q: What protection functions does it have?
A: Zero-start, over-voltage, over-current, short-circuit, and ground detection protection.
