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-45TD
45 kV VLF Hipot & Tan-Delta Diagnostic Test Set
Single-unit 45 kV VLF system combining withstand, tan-delta diagnostics, DC and sheath test with fault location for 5–25 kV cable.
VLF sine wave output
0 – 45 / 0 – 31.8
DC output
± 0 – 45
Output current
0 – 14
Output frequencies
0.1 / 0.05 / 0.02 / 0.01
Tan-delta accuracy
1.0 × 10⁻⁴
Weight
23
Overview
Technical Specifications
| Specification | Value | Unit |
|---|---|---|
| VLF sine wave | 0 – 45 kV peak / 0 – 31.8 kV AC RMS · resolution ± 0.001 kV · accuracy ± 1 % | |
| VLF square wave | 0 – 45 kV peak · resolution ± 0.001 kV · accuracy ± 1 % | |
| DC (proof test, sheath test) | ± 0 – 45 kV · resolution ± 0.001 kV · accuracy ± 1 % | |
| Output current | 0 – 14 mA · resolution 1 µA · accuracy ± 1 % | |
| Output frequency | 0.1 / 0.05 / 0.02 / 0.01 | Hz |
| @ 0.1 Hz | 0.5 µF @ 45 kV peak | |
| @ 0.05 Hz | 1.0 µF @ 45 kV peak | |
| @ 0.01 Hz | 5.0 µF @ 45 kV peak | |
| Maximum voltage | 10 | kV |
| Test current | 0.1 – 5.0 | mA |
| Maximum voltage | 10 | kV |
| Pulse / period modes | 1:3 / 4 s · 1:5 / 4 s · 1:5 / 6 s · 1:9 / 6 s | |
| Frequency | 0.1 / 0.05 / 0.02 / 0.01 | Hz |
| Load range | 5 nF – 10 | µF |
| TD range | 0.01 … 999.99 × 10⁻³ | |
| Accuracy | 1.0 × 10⁻⁴ | |
| Resolution | 1.0 × 10⁻⁵ | |
| Capacitance range / accuracy | 0 – 18.0 µF · typ. 20 % | |
| Resistance range / accuracy | 0.1 – 20 GΩ · typ. 10 % | |
| Internal memory | 128 test records | |
| Interface | USB (data export, firmware update) | |
| Dimensions (L × W × H) | 510 × 310 × 480 | mm |
| Weight | 23 | kg |
| Design | Single integrated unit | |
| Power supply | AC 100 – 240 V, 1-phase, 50/60 Hz | |
| Operating temperature | −10 … +50 | °C |
| Storage temperature | −20 … +70 | °C |
| Humidity | ≤ 90 % RH | |
Key Features
Four-in-one cable test system
VLF withstand, tan-delta diagnostics, DC proof test and sheath test with fault location in one integrated 23 kg unit.
VLF sine wave to 45 kV peak
0 – 45 kV peak / 0 – 31.8 kV AC RMS output with four frequencies from 0.1 Hz to 0.01 Hz.
Square wave and DC modes
0 – 45 kV peak square wave and ± 0 – 45 kV DC for special applications and proof/sheath tests.
Integrated tan-delta diagnostics
TD accuracy 1.0 × 10⁻⁴ and resolution 1.0 × 10⁻⁵ over a 5 nF – 10 µF load for condition assessment of cable insulation.
Sheath test & fault location
Up to 10 kV sheath test at 0.1 – 5.0 mA with selectable fault-location pulse modes.
USB export & firmware update
128 internal test records exportable via USB for reports; firmware updated via USB.
Field-friendly single unit
Runs from 100 – 240 V AC with no external PC; a one-case solution for 5–25 kV cable programs.
Applications
5–25 kV cable testing
Installation, acceptance and maintenance testing of shielded power cable in the 5 kV to 25 kV class.
Tan-delta condition assessment
Water-tree ageing screening of medium-voltage XLPE/EPR circuits by voltage-dependent dielectric loss.
Monitored withstand & step tests
Diagnostic withstand protocols for cables with suspect insulation.
Sheath integrity & fault location
Testing cable oversheaths and locating sheath-to-earth faults per IEC 60229.
DC proof testing
DC proof tests on cable systems and accessories.
Frequently Asked Questions
What advantage does the VLF-45TD's higher voltage give over the VLF-34TD?
The 45 kV peak output extends coverage to cable classes up to roughly 25 kV, whereas the 34 kV model is aimed at 5–15 kV cable. The higher rating also provides margin when the specified test voltage is above 34 kV.
How does the integrated tan-delta unit help with maintenance planning?
By measuring tan delta at several voltage steps, the instrument detects the voltage-dependent loss that indicates water-tree ageing. Circuits can be ranked by condition so maintenance effort is directed at the cables most at risk.
Can the VLF-45TD test VLF and DC in one session?
Yes. The instrument performs VLF withstand, tan-delta diagnostic and DC proof tests, plus sheath test/fault location, and stores up to 128 records for USB export into reports.
Is the built-in sheath fault location a full fault-locating system?
The VLF-45TD applies sheath test voltage and selectable fault-location pulse modes up to 10 kV to condition and pre-locate sheath-to-earth faults. Precise route pinpointing is normally completed with a dedicated cable fault locator / path tracer.
Downloads
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