Sonel S-44 VLF (230 V) High Voltage Insulation Tester
Sonel S-44 VLF (230 V) High Voltage Insulation Tester

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Sonel S-44 VLF (230 V) High Voltage Insulation Tester

Sonel S-44 VLF (230 V) High Voltage Insulation Tester
Index: WMGBS44VLF
 

Description
 

Test the condition of the cables with VLF or DC slow voltage  

The S-44VLF high voltage insulation tester is a compact, robust and portable kit for testing medium voltage cables according to IEEE400, IEC 60502-2, CENELEC HD 620 and 621 and DIN VDE 0276/620 and 621. The test is carried out using the low electrical stress method, with a VLF (Very Low Frequency) voltage of 0.1 Hz.

The VLF test is the fastest way to detect insulation damage. The S-44VLF instrument can test cables with plastic insulation (XLPE, PE-, EPR) as well as paper and oil insulation (PILC). Testing with DC voltage is also possible.

Evaluate the condition of cables using VLF or DC voltage
 

Features

  • Extremely compact high-power VLF test device
  • Easily portable for 1-2 people
  • Simple operation: menu-assisted control with industrial class OLED display
  • Fully automatic test sequence
  • Integrated timer 1-300 min with automatic tripping
  • Integrated breakdown detection
  • Integrated fault time detection
  • Voltage measurement direct at HV output
  • Protective ground connection
  • High voltage start key interlock
  • Protective circuit / indication in accord. with EN 50191
  • Leakage current measurement during VLF test

Overview

The compact, robust and portable cable test set is used for testing of medium voltage cables in accordance to the standards IEEE400, IEC 60502-2, CENELEC HD 620 & 621 and DIN VDE 0276/620 & 621. The test is carried out with a low strain practice with VLF (very low frequency) test voltage at 0.1 Hz frequency.

VLF test enables detection of damages of the insulation within shortest test time. The S  VLF series device can test cables with extruded insulation (XLPE-, PE-, EPR-insulation) as well as cables with paper-oil insulation (PILC). Cable sheath testing with direct voltage is also possible.
 

Optional features

  • Data logging (USB stick) for VLF test sets
  • Frequency extension: 0.05 + 0.02 Hz
  • Customized test cables
  • Transport case
 
 

Technical Specification

  S-24 VLF S-36 VLF S-44 VLF (230 V) S-44 VLF (110 V) S-57 VLF
Indekx WMGBS24VLF WMGBS36VLF WMGBS44VLF WMPAS44VLF WMGBS57VLF
Power supply 230 V (±10%)
10 A, 50/60 Hz
230 V (±10%)
10 A, 50/60 Hz
230 V (±10%)
10 A, 50/60 Hz
110 V (100 V...127 V)
15 A, 50/60 Hz
230 V (±10%)
10 A, 50/60 Hz
Output voltage 0…24 kVRMS VLF 0.1 Hz (option: 0.05 Hz + 0.02 Hz) ± 0…34 kV DC 0…36 kVRMS VLF 0.1 Hz (option: 0.05 Hz + 0.02 Hz) ± 0…52 kV DC 0…44 kVRMS VLF 0.1 Hz (option: 0.05 Hz + 0.02 Hz) ± 0…62 kV DC 0…44 kVRMS VLF 0.1 Hz (option: 0.05 Hz + 0.02 Hz) ± 0…62 kV DC 0…57 kVRMS VLF 0.1 Hz (option: 0.05 Hz + 0.02 Hz) ± 0…62 kV DC
Voltage waveshape          
VLF similar sine-wave, symmetrical, with True RMS measurement similar sine-wave, symmetrical, with True RMS measurement similar sine-wave, symmetrical, with True RMS measurement similar sine-wave, symmetrical, with True RMS measurement similar sine-wave, symmetrical, with True RMS measurement
DC direct voltage, negative and positive polarity direct voltage, negative and positive polarity direct voltage, negative and positive polarity direct voltage, negative and positive polarity direct voltage, negative and positive polarity
Overcurrent trip (DC) 10 mA 10 mA 10 mA 10 mA 10 mA
Max. testable cable length, max. capacitance (VLF) up to 60 km (15 µF at 24 kVRMS, 0.02 Hz)* up to 60 km (15 µF at 18 kVRMS, 0.02 Hz)* up to 60 km (15.0 µF at 18 kVRMS, 0.02 Hz)* up to 60 km (15.0 µF at 6 kVRMS, 0.02 Hz)* up to 60 km (15.0 µF at 18 kVRMS, 0.02 Hz)**
Max. load at max. output voltage (VLF) and 0.1 Hz 5 µF at 24 kVRMS 2.4 µF at 36 kVRMS 1.5 µF at 44 kVRMS 1.0 µF at 44 kVRMS 0.9 µF at 57 kVRMS
Discharge - integrated automatic discharge device max. 9000 J max. 12500 J max. 12500 J max. 12500 J max. 12500 J
Voltage measuring range -40…0…40 kV accuracy ±1% -60…0…60 kV accuracy ±1% -70…0…70 kV accuracy ±1% -65…0…65 kV accuracy ±1% -70…0…70 kV accuracy ±1%
Current measuring ranges ±0…100 µA / 1 mA / 10 mA ±0…100 µA / 1 mA / 10 mA ±0…100 µA / 1 mA / 10 mA ±0…100 µA / 1 mA / 10 mA ±0…100 µA / 1 mA / 10 mA
Operating temperature -20…+45°C -20…+45°C -20…+45°C -20…+45°C -20…+45°C
Storage temperature -25…+70°C -25…+70°C -25…+70°C -25…+70°C -25…+70°C
Duty continuous operation continuous operation continuous operation continuous operation continuous operation
PC interface USB stick USB stick USB stick USB stick USB stick
Construction in two parts: operation unit and high voltage unit in two parts: operation unit and high voltage unit in two parts: operation unit and high voltage unit in two parts: operation unit and high voltage unit in two parts: operation unit and high voltage unit

*at a cable capacitance of approx. 0.25 µF/km

**at a cable capacitance of approx. 0.36 µF/km

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