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- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The GDZG-700-120/3 is a high-performance, portable intelligent DC high voltage generator optimized for DC withstand voltage test and leakage current measurement of 10kV–110kV 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 for fast 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, and zero-position protection, it ensures safe operation for both the operator and the test sample. Ideal for commissioning, periodic maintenance, and fault diagnosis of 10kV–110kV power cables, transformers, generators, switchgear, and lightning arresters.
Specifications
|
Parameter |
Specification |
|
Rated Output Voltage |
300kV DC (negative polarity, zero-start linear adjustable) |
|
Rated Output Current |
2mA DC |
|
Output Power |
600W |
|
Voltage Measurement Accuracy |
±(1.0% reading + 0.2kV)；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) |
|
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: Φ160×1250 |
|
Weight |
Control box: ~8kg；Voltage doubling cylinder: ~11kg |
|
Compliance |
DL/T 848.1-2004, DL/T 474.2-2006, IEC 61010-1 CAT III 1000V |
Applications
Core Test Objects
- Power cables: 10kV–220kV XLPE/PVC insulated cables (DC withstand voltage test)
- Power transformers: 10kV–500kV 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
- Capacitors: high-voltage power capacitor insulation test
Typical Usage Scenarios
- Preventive maintenance: periodic DC hipot test of power equipment
- Commissioning: new equipment 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
High-Frequency PWM + Low Ripple
30–50kHz technology；≤1.0% ripple coefficient → accurate leakage current measurement
One-Key 75%UDC1mA MOA Test
Automatically locks voltage；saves time and reduces human error → fast and reliable arrester testing
Comprehensive Protection System
Zero-start + over-voltage + over-current + short-circuit + ground detection → maximum safety for operator and equipment
Portable Split Design
Lightweight control box and voltage doubling cylinder → easy transport and field deployment
High Precision & Compliance
±1.0% measurement accuracy；fully meets DL/T 848.1 → reliable test results and regulatory compliance
FAQ
Q: Can it test 220kV power cables?
A: Yes. 300kV output voltage is sufficient for DC withstand voltage test of 220kV cables.
Q: Does it support automatic MOA testing?
A: Yes. One-key 75%UDC1mA function automatically locks voltage and measures leakage current.
Q: What protection functions does it have?
A: Zero-start, over-voltage, over-current, short-circuit, and ground detection protection.
Q: Is it portable for field use?
A: Yes. Split design；control box ~8kg, voltage doubling cylinder ~11kg；easy to transport.
