Product introduction
The VLF Hipot Tester (Very Low Frequency High Potential Tester) is a specialized instrument designed to conduct high-voltage insulation tests on electrical cables and equipment. It is a highly effective and cost-efficient device, commonly used to replace small-series resonance test equipment for performing withstand voltage tests on power devices like cables. By incorporating advanced digital frequency conversion technology and utilizing microcomputer control, the entire process of voltage ramping, measurement, and protection is fully automated.
Product Parameters
Technical parameter
| Power supply | AC220V±5%, 50/60Hz. If using a generator, it must be a digital inverter generator with 220V output and power >8kW. Ordinary generators or UPS power supplies are prohibited. |
| Output Voltage | 30kV, 40kV, 50kV, 60kV, 70kV, 80kV, 80kV, 90kV |
| Output frequency | 0.1Hz, 0.05Hz, 0.02Hz,0.01Hz |
| Load Capacity | 0.1Hz-0.5μF, 0.05Hz-1.0μF,0.02Hz-2.5μF,0.01Hz-5μF |
| Measurement accuracy | 3% |
| Voltage positive,negative peak error | ≤3% |
| Voltage waveform distortion | ≤5% |
| Operating Environment | Temperature: -10℃~+40℃ |
| Humidity | ≤85%RH |
Ultra-low frequency series products
| Model number | Rated voltage | Carrying capacity | Power supply fuse | Generator power | Product structure, weight |
| VLF-60kV | 60kV(peak) | 0.1Hz,≤0.6μF | 20A | >6kW | Controller: 4kg, booster: 45kg |
| 0.05Hz,≤1.2μF | |||||
| 0.02Hz,≤3μF | |||||
| 0.01Hz,≤6μF | |||||
| VLF-80kV | 80kV(peak) | 0.1Hz,≤0.5μF | 30A | >8kW | Controller: 4kg, booster: 50kg |
| 0.05Hz,≤1.0μF | |||||
| 0.02Hz,≤2.5μF | |||||
| 0.01Hz,≤5μF | |||||
| VLF-90kV | 90kV(peak) | 0.1Hz,≤0.4μF | 30A | >9kW | Controller: 4kg, booster: 55kg |
| 0.05Hz,≤.0.8μF | |||||
| 0.02Hz,≤2.0μF | |||||
| 0.01Hz,≤4μF |
Product advantages of VLF Hipot Tester
1. Exceptional Stability
The VLF hipot tester is known for its high precision and remarkable stability. It performs reliably even under extreme conditions such as high temperatures, strong lighting, magnetic fields, and interference, ensuring long-term operational stability.
2. High Output Accuracy
This VLF hipot tester delivers highly accurate output voltage and current, making it ideal for high-precision experiments and manufacturing processes that demand precise measurements.
3. Safe and User-Friendly Operation
The operation of the VLF hipot tester is straightforward and dependable, offering stable output with enhanced safety features. It adheres to quality management standards, ensuring both safety and reliability for the user.
Main Application Fields of VLF hipot tester
1. Power Cables (especially medium/high voltage XLPE cables):
Acceptance Testing: Verification of installation quality and insulation strength after new cable laying.
Preventive Testing/Condition-Based Maintenance: Periodic assessment of insulation condition for in-service cables, detecting hidden defects like water treeing, electrical treeing, moisture ingress, and localized faults. VLF testing is particularly effective for identifying water treeing in XLPE cables.
Post-Repair Verification after Fault Location: Confirming repair effectiveness and overall insulation reliability after cable fault restoration.
Withstand Voltage Testing: Applying specified VLF high voltage to the cable for a defined duration to assess its insulation withstand capability.
2. Large Rotating Machines (Generators, Large Motors):
Stator Winding Insulation Assessment: Performing withstand voltage tests and insulation diagnostics on stator windings. VLF testing
significantly reduces the required power supply capacity, enabling on-site generator testing.
Preventive Maintenance: Periodic inspection of winding insulation for aging, moisture, and contamination.
3. Power Transformers:
Alternative to On-Site AC Power Frequency Withstand Testing: An effective substitute for power frequency withstand tests on large transformers, especially on-site where conventional testing is impractical, for evaluating main insulation strength.
Supplementary to Induced Voltage Testing: Sometimes used in combination with induced voltage tests.
4. Other High-Voltage Electrical Equipment:
Switchgear (GIS, AIS): Insulation testing of components like circuit breakers, disconnectors, and busbars.
Surge Arresters: Occasionally used for AC withstand or leakage current testing after DC reference voltage tests (requires attention to equipment compatibility).
Bushings, Insulators: Evaluation of their insulation performance.
Power Capacitors: Inter-terminal withstand voltage testing.
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