EN
- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The HVD-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.
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) |
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 HVD-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.
