VLF-90
The VLF-90 is a 90 kV peak sinusoidal VLF hipot test set that brings the family's highest rating…
- Maximum output voltage 0 – 90
- Output current 0 – 30
- Output frequencies 0.1 / 0.05 / 0.02 / 0.01
VLF-50
50 kV Very Low Frequency (VLF) AC Cable Test Set
50 kV peak VLF hipot built for long cable spans — feeders, submarine links and wind/solar farm circuits.
Maximum output voltage
0 – 50
Output current
0 – 30
Output frequencies
0.1 / 0.05 / 0.02 / 0.01
Load rating at 0.01 Hz
≤ 5.5
Measurement accuracy
± 3 % of reading
Controller + HV tank
4 + 40
Overview
Technical Specifications
| Specification | Value | Unit |
|---|---|---|
| Output AC voltage (peak, sinusoidal) | 0 – 50 | kV |
| Output current (peak) | 0 – 30 | mA |
| Output frequency | 0.1 / 0.05 / 0.02 / 0.01 | Hz sinusoidal |
| Duty cycle | Continuous | |
| @ 0.1 Hz | ≤ 0.5 | µF |
| @ 0.05 Hz | ≤ 1.1 | µF |
| @ 0.02 Hz | ≤ 2.2 | µF |
| @ 0.01 Hz | ≤ 5.5 | µF |
| Measurement accuracy | ± 3 % of reading | |
| Voltage positive / negative peak error | ≤ 3 % | |
| Controller unit weight | 4 | kg |
| High-voltage tank (booster) weight | 40 | kg |
| Design | Two-piece split system (controller + HV tank) | |
| Power supply | AC 220 V / AC 230 V, 50/60 Hz, or AC 120 V, 60 Hz | |
| Operating temperature | −10 … +50 | °C |
| Storage temperature | −20 … +70 | °C |
| Humidity | ≤ 85 % RH | |
Key Features
Built for long cable spans
Feeder, submarine and wind/solar farm circuits where capacitance quickly exceeds smaller sets — tested at 50 kV peak down to 0.01 Hz.
25 kV-class cable coverage
Positioned for AC withstand testing of 25 kV-class shielded power cable per IEEE 400.2-2013/2024 and IEC 60502-2.
High capacitive load rating
Drives up to 5.5 µF at 0.01 Hz, keeping full rated voltage on multi-kilometre circuits.
True sinusoidal VLF waveform
Polarity-reversing AC stress with no DC space-charge effects on polymer-insulated cable.
Split two-piece system
4 kg controller and 40 kg high-voltage tank for two-person field deployment.
Automatic IEEE 400.2-2013 interpretation
7-inch touch screen judges results, stores them internally and prints reports on the thermal printer.
PC-free field documentation
Full test record produced on site without a laptop.
Applications
Long distribution feeders
AC withstand testing of long distribution and sub-transmission cable circuits.
25 kV-class cable systems
Testing of 25 kV-class shielded power cable systems per IEEE 400.2 / IEC 60502-2.
Submarine cable links
Commissioning and maintenance testing of submarine cable circuits.
Wind & solar farms
Collector and export cable testing in renewable power plants.
Post-repair verification
Verification of long cable sections and joints after repair.
Frequently Asked Questions
Why is a 50 kV VLF set particularly useful for wind and solar farms?
Collector and export circuits in renewable plants are often long and high-capacitance. The VLF-50's low output frequencies keep charging current within the set's 30 mA capability over spans that would be impractical at 50/60 Hz, and its 50 kV peak covers the test voltages these circuits require.
What cable class is the VLF-50 designed to test?
The instrument is positioned for AC withstand testing of 25 kV-class shielded power cable in accordance with IEEE 400.2-2013/2024 and IEC 60502-2.
How does lowering the frequency help on long cables?
Charging current is proportional to frequency and capacitance. Testing at 0.05, 0.02 or 0.01 Hz instead of 0.1 Hz cuts the current demand proportionally, allowing longer and higher-capacitance circuits to be tested at full rated voltage.
Can the VLF-50 be used without a PC on site?
Yes. The control unit, tank and cabling are sized for two-person field deployment, and the touch screen handles setup, automatic interpretation and thermal printing without a PC.
Downloads
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