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- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The GDZG-S 80kV/200mA is a special-purpose high-power DC high voltage test system exclusively designed for water-cooled synchronous generators, enabling DC withstand voltage and leakage current tests directly under water-flow conditions without the need for time-consuming water blow-off. It fully complies with DL/T 596-2021 and GB/T 1029-2005, adopting the advanced low-voltage shielding measurement principle and built-in ±2.5V polarization potential compensation to accurately separate the stator winding leakage current from the water pipe conduction current, eliminating the influence of water flow polarization potential and ensuring reliable test results.
The system consists of a portable intelligent control box and a lightweight high-voltage doubling cylinder, adopting 30–50kHz high-frequency PWM technology and high-power IGBT devices to deliver stable 80kV/200mA output with low ripple coefficient. Equipped with a large LCD display and intuitive operation interface, it supports one-key automatic test (auto boost → step hold → auto step-down → auto shutdown) and real-time voltage/current waveform display. With comprehensive over-voltage, over-current, breakdown, zero-start, and ground detection protection, it ensures maximum safety for both the generator and the operator. Ideal for preventive maintenance, overhaul, and commissioning tests of 6.3kV–20kV water-cooled generator stator windings.
Specifications
|
Parameter |
Specification |
|
Rated DC Output Voltage |
0–80kV (negative polarity, zero-start linear adjustable) |
|
Rated DC Output Current |
200mA |
|
Output Power |
16kW |
|
Voltage Measurement Accuracy |
±1.0% of reading ±1 digit |
|
Total Current Measurement Accuracy |
±1.0% of reading ±1 digit |
|
Winding Leakage Current Accuracy |
±2.0% of full scale |
|
Ripple Coefficient |
≤3.0% |
|
Voltage Stability |
≤1.0% (power supply ±10% fluctuation) |
|
Polarization Compensation Range |
±2.5V |
|
Measurement Principle |
Low-voltage shielding method |
|
Test Modes |
Manual, Automatic Step, Timed |
|
Step Hold Time |
1 minute (adjustable) |
|
Data Storage |
100 groups；time-stamped；USB export |
|
Protection Functions |
Zero-start, Over-voltage, Over-current, Breakdown, Ground detection, Emergency stop |
|
Power Supply |
3-phase 380V±10%, 50Hz |
|
Cooling System |
Forced air cooling |
|
Continuous Operation Time |
5 minutes at full load |
|
Dimensions (mm) |
Control box: 600×450×275；Doubling cylinder: Φ280×420 |
|
Weight |
Control box: ~35kg；Doubling cylinder: ~10kg |
|
Operating Temperature |
-10℃ ~ +40℃；Humidity ≤85%RH (non-condensing) |
|
Compliance |
DL/T 596-2021, GB/T 1029-2005, DL/T 848.1-2004, IEC 61010-1 CAT III 1000V |
Applications
Core Test Objects
- Water-cooled synchronous generators: 6.3kV–20kV stator winding DC withstand voltage test
- Water-cooled generator stator windings: DC leakage current measurement
- Hydro generators and steam turbines: water-cooled stator insulation test
- Large industrial motors: water-cooled winding insulation test
Typical Usage Scenarios
- Preventive maintenance: periodic insulation test according to DL/T 596-2021
- Overhaul test: stator winding insulation verification after major repair
- Commissioning test: new generator acceptance test before put into operation
- Fault diagnosis: insulation degradation, moisture ingress, or local defect detection
- On-site power plant testing: portable design for remote power plant use
Advantages
No Water Blow-Off Required
Tests directly under water-flow conditions；saves 8–24 hours of generator downtime → significantly reduces maintenance cost and outage time
Low-Voltage Shielding + Polarization Compensation
Accurately separates winding leakage current from water pipe current；eliminates polarization potential interference → reliable and accurate test results
80kV/200mA High-Power Output
Sufficient current for water-cooled generator winding tests；stable output under high capacitive and conductive loads → no voltage drop during test
Automatic Step Test (DL/T 596 Compliant)
One-key automatic test according to standard procedures；reduces human error and improves testing efficiency → ensures test compliance
Comprehensive Safety Protection
Multiple protection layers + external MOA option → maximum safety for both the expensive generator and the operator
FAQ
Q: Do I need to blow off the water in the generator windings before testing?
A: No. The GDZG-S is designed to test directly under water-flow conditions using the low-voltage shielding method, eliminating the need for time-consuming water blow-off.
Q: What is polarization potential compensation?
A: Water flow through metal pipes generates a polarization potential that can cause leakage current reading drift. The built-in ±2.5V polarization compensation automatically eliminates this interference, ensuring accurate measurements.
Q: Does it comply with DL/T 596-2021 test procedures?
A: Yes. The automatic step test mode follows the standard procedure: 0→50%→75%→100% test voltage with 1-minute hold at each step.
Q: What protection does it provide for the generator?
A: It features comprehensive over-voltage, over-current, and breakdown protection, with an optional external zinc oxide arrester for additional generator over-voltage protection.
