VLF-60

Cable Insulation Tester

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VLF-60 Cable Insulation Tester made by KEP is a very low frequency high potential tester that ensures efficient testing and fault location on medium voltage cables.

Very low frequency (VLF) testing involves applying frequency in the range of 0.01 to 0.1 Hz to the cable under test, which is non-destructive to insulation of proper quality, but is enough to detect cable faults. Compared to DC cable testing, which can be damaging to good insulation, VLF testing does not have such a detrimental effect on the cable being tested.

MAIN FEATURES:

  • Efficient non-destructive cable withstand testing
  • Portable, perfect for field testing
  • Test capacity of 10 µf
  • Fully automatic testing cycle
  • Automatic discharging
  • Easy maintenance due to solid-type insulation system
  • Breakdown voltage measurement and load recognition
  • Easy-to-use software
  • Does not need an external PC
  • LCD touchscreen

Technical Specifications

ParameterValue
Output Voltage:
– Sinusoidal0 – 62 kV peak / 0 – 44 kV RMS
– DC± 0 – 60 kV
– Squarewave0 – 60 kV
– Accuracy± 1 %
– Resolution0.1 kV
Output Curent:
– Sinusoidal (RMS)26 mA
– DC / Squarewave 40 mA
– Accuracy± 1 %
– Resolution1 μA
Output Frequency0.01 – 0.1Hz in steps of 0.01 Hz (default 0.1 Hz) – auto
 frequency selection
Output Load1 μF @ 0.1 Hz @ 44 kV RMS
5.0 μF @ 0.01 @ 44 kV RMS
10.0 μF max capacitance (at lower frequency
and Voltage)
Output Modes 
– VLF AC Sinewaveyes
– VLF AC Squarewaveyes
– DC (positive or negative polarity)yes
– Vacuum Bottle Test Mode (DC)yes
 – Cable Jacket / Sheath Testingyes
 – Sheath Fault Locationyes
Breakdown Mode
– Fault Condition Modeyes
– Fault Trip Modeyes
Metering
– Voltage and CurrentTrue RMS and / or peak
– Capacitance0.1 nF to 20 μF Range
– Resistance0.1 MΩ to 20 GΩ
– WaveformReal time oscilloscope display of actual 
output voltage waveform
Safety50 / 60 Hz – 12 kV Feedback Protection /
Dual Discharge Device (internal)
Duty CycleContinuous
Computer InterfacesUSB, RS-485
DisplayColor touchscreen TFT 5.7 “ (115 × 86 mm)
Input Voltage(110 to 240) V AC ±10 %, 50 / 60 Hz
Consumption Power1.2 kVA
Dimensions (H × W × D)530 × 580 × 410 mm
Weight60 kg
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