VLF-60

PORTABLE HIGH-VOLTAGE VLF TEST SYSTEM

The system is designed for VLF (0.1 Hz) withstand testing of cross-linked polyethylene (XLPE) insulated cables.

  • VLF testing of cables with polymeric insulation (incl. XLPE cables).
  • Hipot testing of solid dielectrics with DC voltage of positive or negative polarity.
  • Cable faults conditioning by initial insulation burning.
  • Vacuum bottle test.
  • Cable sheath testing and fault pinpointing.
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VERSATILITY

Apart from very low frequency (VLF) and DC withstand testing, VLF-60 system also performs cable fault conditioning by initial burning faulty insulation, tests cable sheath and pinpoints its faults.

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Automatic

MANUAL AND AUTOMATIC OPERATING MODES

The system allows to carry out tests in both automatic and manual control modes.

In the manual mode the operator enters all test parameters, which makes VLF‑60 suitable for testing a wide range of electrical equipment according to various standards and regulations.

In the automatic mode minimal test settings entries are required: the operator only selects a test object type and voltage rating and the system automatically sets all the necessary test parameters according to IEEE 400.2-2013.

TESTING HIGH-CAPACITANCE OBJECTS

At the start of every test, VLF-60 measures the resistance and capacitance of an object under test. Based on the obtained results, the system evaluates its power output capability. If the system is not able to output the voltage of a required magnitude and frequency for a given load, it will automatically reduce the output frequency. Thanks to such output frequency optimisations, the VLF-60 can be used effectively for testing objects with capacitance up to 10 µF.

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10,000 TEST REPORTS STORAGE

Non-volatile memory of the system capable of storing up to 10,000 test reports.

It is possible to search and view test reports right from the display of the system.

Test reports may be exported from the system to a USB memory stick in CSV or PDF format without using a PC.

TOUCH CONTROL

The main user interface component is a touch-sensitive colour TFT display, which is used for navigating menus and entering data. During a test, an output voltage wave is visualised on the display in real time.

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PORTABILITY AND SMALL WEIGHT

VLF-60 system is fitted with carrying handles and weighs only 64 kg, which enables operational comfort both in the lab and in the field conditions.

SAFETY

✓ Dual discharge device (internal automatic protection).

✓ Visual indication of high voltage presence on an object under active test.

✓ Visual indication of residual or stray voltage presence on an object after conclusion of a test.

✓ Sound alarm when high voltage is switched on.

✓ Emergency stop button.

✓ Operator keylock switch.

✓ Protective earthing.

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* Pictures used herein are for illustration purposes only. Products' specifications are subject to change without notice. *


Technical Specifications
Output voltage Setting and measurement range:  
 

- Sinewave

- Bi-polar pulse

- DC+

- DC-

- Vacuum bottle test

- Sheath test

- Sheath fault location

0.1 … 62kVpeak (44 kVRMS)

0.1 … 62kVpeak

+ 0.1 … 60kV

- 0.1 … 60kV

- 0.1 … 60kV

- 0.1 … 10kV

+ 0.1 … 10kV

  Measurement resolution 0.1kV
  Relative accuracy ± [2% + 2dgt ]
  Indication Real time wave visualization
Output current Setting and measurement range:  
 

- Sinewave

- Bi-polar pulse

- DC+

- DC-

- Vacuum bottle test

- Sheath test

- Sheath fault location

0.1 … 40mApeak (26 mARMS)

0.1 … 40mApeak

0.1 … 40mA

0.1 … 40mA

1 … 1000µA

0.1 … 40mA

0.1 … 40mA

  Measurement resolution 1µA; 0.1mA
  Relative accuracy ± [2% + 2dgt]
Output frequency
(sinewave, bi-polar pulse)
Output frequency 0.01 … 0.1Hz with 0.01Hz step
  Frequency selection

- Automatic

- Manual

Output power up to 1200W  
Breakdown management Burn on Arc (keep arc burning) Conditioning (burning) duration is set in the range of 1-5 minutes
  Trip out on Arc (current limit trip) A test is stopped if leakage current threshold is reached or exceeded
Object under test Capacitance measuring range3 0.1nF … 12µF
  Resistance range 10kOhm … 20kOhm
  Maximum load

- 1.0 µF at 0.1 Hz, 44kVRMS

- 5.0 µF at 0.02 Hz, 44kVRMS

- 10.0 µF at 0.01 Hz, 44kVRMS

  Duty cycle Continuous, unlimited
Tan Delta Range 1×10-4 … 1
  Resolution 1×10-5
  Absolute error ± 1×10-4
  Auto Tan Delta test According to IEEE 400.2-2013
Metering

- Voltage and сurrent (RMS and/or peak)

- OuT capacitance

- OuT resistance

- Test time

- Breakdown voltage and current

- Tan δ4

 
Controls and interfaces Connection interfaces

- USB-A (user memory stick, formatted under FAT32)

- USB-B (service only)

- RS-485

  Display 5.7” colour TFT, 640 × 480 px, capacitive multi-touch
  Secondary control interface Rotary encoder
  Internal memory 10,000 test reports
Safety Protective devices

- Automatic internal dual discharge

- Indication of high voltage presence on the load

- Emergency stop button

- Operator keylock switch

- Thermal circuit breaker

  Protection rating (as per EN 60529) IP 21 (with lid closed)
Power supply and consumption Supply voltage 110 … 230V ±10%, AC, single phase
  Supply frequency 50 / 60Hz
  Power consumption 1.5kVA
Physical Dimensions, H×W×D 528×577×408mm
  Weight 64kg

dgt - an error in least significant digits, that is constant regardless of the input.

Values measured on the high AC voltage may significantly differ from the values measured by a standard low-voltage multimeter.

For Systems equipped with optional integrated tan δ.

dgt - an error in least significant digits, that is constant regardless of the input.

Values measured on the high AC voltage may significantly differ from the values measured by a standard low-voltage multimeter.

For Systems equipped with optional integrated tan δ.

[1] dgt - an error in least significant digits, that is constant regardless of the input.

[2] Values measured on the high AC voltage may significantly differ from the values measured by a standard low-voltage multimeter.

[3] For Systems equipped with optional integrated tan δ.

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