VLF-80
The VLF-80 is an 80 kV peak sinusoidal VLF hipot test set for field testing of medium- and…
- Maximum output voltage 0 – 80
- Output current 0 – 30
- Output frequencies 0.1 / 0.05 / 0.02 / 0.01
VLF-90
90 kV Very Low Frequency (VLF) AC Hipot Test Set
The highest-rated VLF in the family — 90 kV peak in a portable, affordable split-system hipot for power cable testing.
Maximum output voltage
0 – 90
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 + 55
Overview
Technical Specifications
| Specification | Value | Unit |
|---|---|---|
| Output AC voltage (peak, sinusoidal) | 0 – 90 | 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 | 55 | 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
Highest rating in the VLF family
90 kV peak sinusoidal output gives maximum reach of any VA-TEK VLF set for shielded cable testing within its rating.
Portable and affordable
No resonant test trailer needed — the controller and 55 kg tank cut both capital and mobilization cost versus mains-frequency alternatives.
Routine & maintenance withstand coverage
Covers the majority of routine and maintenance VLF withstand work on medium/high-voltage shielded cable circuits.
High capacitive load rating
Up to 5.5 µF at 0.01 Hz keeps full rated voltage on long high-voltage feeders.
Space-charge-free AC stress
Sinusoidal polarity-reversing waveform for safe testing of XLPE/EPR insulation.
Split two-piece system
4 kg controller plus 55 kg high-voltage tank for transportable high-voltage proof testing.
Automatic interpretation & reporting
IEEE 400.2-2013 pass/fail from the 7-inch touch screen, stored internally and printed on the thermal printer without a PC.
Applications
Routine & maintenance withstand testing
VLF proof testing of medium/high-voltage shielded power cables within the 90 kV rating.
Post-installation / post-repair verification
Verification of high-voltage cable circuits after installation or repair.
Long high-voltage feeders
Proof testing of long distribution and sub-transmission feeders.
Contractors, utilities & rental fleets
High-voltage cable testing for contractors, utilities and test-equipment rental operations.
General field hipot duty
General-purpose field hipot testing where 90 kV peak provides the required margin.
Frequently Asked Questions
How does the VLF-90 compare with the VLF-80?
Both are split-system VLF hipot sets with the same 0.1–0.01 Hz frequencies, 30 mA output and load characteristics. The VLF-90 offers a higher peak voltage (90 kV vs 80 kV), giving more margin on high-voltage shielded cable circuits, while its high-voltage tank is slightly heavier (55 kg vs 50 kg).
What does portable and affordable mean for a 90 kV-class set?
Because the VLF waveform cuts charging-current demand by hundreds of times versus 50/60 Hz, the VLF-90 does not need a resonant test trailer. It ships as a controller and a 55 kg tank, keeping both capital cost and mobilization cost far below mains-frequency alternatives of the same voltage class.
Should the 90 kV rating be compared as RMS or peak when setting a test?
The 90 kV is a peak rating. IEEE 400.2 test voltages for cable are multiples of the cable's phase-to-earth voltage U0 — compare the required test level to the set's peak rating directly and do not multiply the kV figure by √2.
Which cable classes does the VLF-90 cover?
It tests any shielded power cable whose specified VLF test voltage is within 90 kV peak. This covers routine and maintenance withstand levels across the medium/high-voltage distribution and sub-transmission range; acceptance testing of classes whose test voltage exceeds the rating requires a higher-rated host.
Downloads
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