Product introduction
The VLF test kit is a portable instrument specifically designed for on-site insulation diagnostics and withstand voltage testing of high-voltage equipment. By generating high-voltage sinusoidal waves at ultra-low frequencies (0.1Hz or lower), hipot vlf replaces traditional power-frequency test systems, overcoming field-testing challenges for large-scale electrical assets (e.g., cables, generators). It serves as an essential tool for power maintenance and project acceptance testing.
Product Parameters
Ultra-low frequency series products
| Model number | Rated voltage | Carrying capacity | Power supply fuse | Generator power | Product structure, weight |
| 30/1.1 | 30kV(peak) | 0.1Hz, ≤1.1μF | 10A | >3kW | Controller: 4kg, booster: 25kg |
| 0.05Hz,≤2.2μF | |||||
| 0.02Hz,≤5.5μF | |||||
| 0.01Hz,≤11μF | |||||
| VLF-40kV | 40kV(peak) | 0.1Hz,≤0.8μF | 15A | >4kW | Controller: 4kg, booster: 25kg |
| 0.05Hz,≤1.6μF | |||||
| 0.02Hz,≤4μF | |||||
| 0.01Hz,≤8μF | |||||
| VLF-50kV | 50kV(peak) | 0.1Hz,≤0.7μF | 20A | >5kW | Controller: 4kg, booster: 35kg |
| 0.05Hz,≤1.4μF | |||||
| 0.02Hz,≤3.5μF | |||||
| 0.01Hz,≤7μF |
Performance comparison of various pressure test equipment
| Comparative content | Power frequency withstand voltage | Variable frequency voltage resistance | Withstand voltage 0.1Hz | Dc voltage resistance |
| equivalence | good | good | good | In general |
| Insulation destructiveness | small | small | small | larger |
| Operational safety | lower | lower | high | lower |
| Test connection | complex | complex | simple | simple |
| Equipment volume | maximum | larger | small | small |
Application areas of VLF test kit
1. Research laboratory
VLF test kits are commonly used in laboratory research in fields such as physics, chemistry, biology, and medicine. In these experiments, high-precision and stable electric fields or voltage sources are required to provide precise experimental conditions. For example, in biology, a cutting-edge research direction is to use high-voltage electric fields to achieve cell membrane rupture, fusion, or transformation, which requires high-precision and stable high-voltage power sources.
2. Medical institutions
The medical field is also one of the main application areas of VLF test kits. This device can be used in surgeries such as electrotherapy, electrocautery, and coagulation, as well as for producing radioactive drugs or conducting nuclear medicine examinations. For example, in tumor treatment, high-precision and stable electric fields or voltage sources are often required to better cut or ablate tumor tissue.
3. Industrial manufacturing
VLF test kits are also widely used in industrial fields such as electronics, electrical manufacturing, petroleum, and chemical engineering. For example, in some electronic products, a high-voltage direct current power supply is required to ensure the normal operation of the equipment. In fields such as petroleum and chemical engineering, high-precision output of such equipment is also required to ensure the reliability and safety of manufacturing processes.
Core advantages of VLF test kit
1.Portability & Reduced Size/Weight:
Due to the extremely low test frequency (0.1Hz is 1/500th of 50Hz), the required power supply capacity is only 1/500th of that needed for power frequency testing. This results in a significantly smaller and lighter test set (generator), making it highly suitable for mobile field testing.
2.Reduced Insulation Damage:
VLF test kit voltage causes less cumulative damage to insulation materials (especially solid insulation like XLPE) compared to power frequency AC voltage, contributing to extended equipment lifespan.
3.Effective Diagnosis of Water Treeing Degradation:
For Cross-Linked Polyethylene (XLPE) cables, 0.1Hz VLF test kit voltage is particularly effective at exciting leakage current or dissipation factor signals indicative of water treeing aging. This makes it a crucial diagnostic tool for assessing the insulation condition of XLPE cables.
4.Enhanced Detection of Concentrated Defects:
VLF test kit voltage readily initiates discharges or breakdowns during withstand tests if severe concentrated defects (e.g., cracks, sharp impurities) are present, serving as an effective screening method.
5.Standard Recognition & Validity:
International (IEC) and national standards (e.g., DL/T standards in China, IEEE 400.2) explicitly recognize VLF withstand testing as a valid method for field testing and diagnostics of power cables and other equipment.
FAQS
Does the VLF test kit comply with international standards?
It complies with major international standards, including:
IEC 60502 (Power cables)
IEC 60060 (High-voltage testing)
IEEE 400.2 (VLF cable testing guide)
Relevant GB/T national standards
Does the system require high power input?
No.
VLF testing features:
Low power consumption
Operates with a small power supply
Minimal impact on site electrical systems
Can the VLF test kit test long cables?
Yes.
VLF is a mainstream method for long cable testing, suitable for:
Urban power distribution cables
Industrial park cable systems
Long-distance transmission cables
How long does a typical test take?
Usually:
15 to 60 minutes, depending on standards or customer requirements
Does the VLF test kit support data recording and reporting?
Yes, it records full test data, including:
Voltage curve
Current curve
Test duration
Test result
Data export formats:
PDF report
Excel data
Custom report formats available
Can the the VLF test kit be customized?
Yes. UHV provides customized solutions for:
Different voltage ratings
Different capacity configurations
Different waveform outputs
Special cable testing requirements
Is maintenance complicated?
No. Main maintenance includes:
Cable and connection inspection
Grounding check
Periodic calibration
Optional software updates
Do you provide training and technical support?
UHV provides:
Operation training
On-site commissioning support
Video guidance
Technical documentation
What does after-sales service include?
Remote technical support
Fault diagnosis
Spare parts supply
Software upgrades
Long-term maintenance support
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