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- Description
- Specifications
- Applications
- Advantages
- FAQ
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Description
The GDZG-301-300kV/3mA is a high-voltage, high-power intelligent DC high voltage generator designed for DC withstand voltage test and leakage current measurement of 220kV electrical equipment in high-voltage 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 high-insulation 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 220kV 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 |
3mA DC |
|
Output Power |
900W |
|
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 |
≤0.5% (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: 400×300×200；Voltage doubling cylinder: Φ160×1100 |
|
Weight |
Control box: ~12kg；Voltage doubling cylinder: ~18kg |
|
Compliance |
DL/T 848.1-2004, DL/T 474.2-2006, IEC 61010-1 CAT III 1000V |
Applications
Core Test Objects
- 220kV power cables: XLPE insulated cables (DC withstand voltage test)
- 220kV power transformers: winding insulation resistance and leakage current
- High-voltage generators: high-voltage winding DC withstand voltage test
- 220kV lightning arresters: zinc oxide (MOA) and magnetic blow arresters (75%UDC1mA test)
- Switchgear: GIS, vacuum breakers, insulators, bushings
- High-voltage capacitors: power capacitor insulation test
Typical Usage Scenarios
- Preventive maintenance: periodic DC hipot test of 220kV high-voltage equipment
- Commissioning: new 220kV equipment insulation verification before put into operation
- Fault diagnosis: insulation degradation, moisture ingress, or damage detection
- Field testing: split design for on-site substation and power plant use
- Compliance inspection: meets DL/T 848.1 and power industry safety standards
Advantages
300kV/900W Ultra-High Power
Highest voltage in GDZG series；stable output for 220kV long cables → reliable insulation testing for high-voltage grids
≤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
Heavy-Duty Insulation Design
Epoxy glass fiber cylinder；high insulation strength, anti-moisture → stable performance in harsh environments
FAQ
Q: Can it test 220kV power cables?
A: Yes. 300kV output voltage and 900W high power are ideal 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: How heavy is the voltage doubling cylinder?
A: ~18kg；two-person operation recommended for safety and convenience.
Q: What protection functions does it have?
A: Zero-start, over-voltage, over-current, short-circuit, and ground detection protection.
Q: What's included in the standard package?
A: Control box, voltage doubling cylinder, high-voltage cable, ground cable, discharge rod, power cord, carry case, user manual, calibration certificate.
