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2.1 General Description
Functional description The VLF Sinus test system enables testing of medium-voltage cables in accordance with
the CENELEC Harmonization Documents HD 620 S1:1996 und HD 621 S1:1996 with a
0.1 Hz sine wave voltage of up to 24 kV
RMS
.
With the aid of such cable testing, faults in the insulation - particularly water tree damage -
will be reliably made to flash over in PE/XLPE cables but also in paper insulated cables.
The test procedure does not damage fault-free insulation.
The cables can also be tested for dielectric breakdown strength with positive and negative
DC voltage, as well as with trapezoidal AC voltage (rectangular wave voltage).
The slew rate of the rectangular wave voltage depends on the cable capacitance and is
automatically adapted.
The additional leakage current measurement
in DC mode enables evaluation of the
relative quality of the cable insulation.
The sine-wave shape of the system test voltage can also be used in combination with the
tan Delta test attachment from Megger to determine the loss factor and thus the cable's
degree of deterioration. A detailed description of this use can be found in the operating
manual of the tan Delta test attachment.
Features The VLF Sinus test system unites the following features and functions in a single device:
• Full AC voltage testing up to 24 kV
RMS
(sine wave voltage)
• Additional output voltage shapes of DC and rectangular wave
• Sheath testing and pinpointing up to 10 kV
• Leakage current measurement
• Manual and automatic frequency adjustment
• Voltage breakdown detection with automatic disconnection of the high voltage
• Logging to USB
• Firmware updates via USB
Scope of delivery The scope of delivery of the test system comprises the following components:
• Trolley bag with extendable handle
• Mains power cable, 2.5 m
• Earthing cable, 4 m
• HV connection cable, 5 m
• USB stick
• Operating manual
• Accessory bag
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