Compact VLF sine wave test system

• Test capacity of up to 10μF – that’s up to 40 km or 25.8 miles of cable at reduced frequency and voltage
• Internal tanδ option with automatic results interpretation
• One minute burn after fault detection
• Automatic frequency adjustment based on cable length
• Adjustable DC pulse rates of 1:3 and 1:4
• IEEE compliant withstand testing for new installations up to 25 kV
• IEEE 400.2 compliant maintenance testing up to 35 kV
• IEC 60229 compliant sheath testing up to 20 kV DC

The VLF Sine Wave 45, with optional integrated tanδ, is a compact system for commissioning, testing and condition analysis of medium-voltage cables. This unit performs very low frequency (VLF), DC, and sheath integrity testing as well as sheath fault pinpointing when combined with the optional ESG NT step voltage probe. Ideal for both routine testing and complicated diagnostics, the VLF45 has a multi-purpose design with a continuous duty cycle.

For 0.1 Hz sine wave, rectangular or DC voltage tests, the VLF45 provides enhanced voltage quality and stability. In the event of excessive charge current integrated breakdown detection shuts down the test, ensuring limited damage to the cable. Up to 1000 measurements can be stored in the internal memory and results can be viewed on the unit or downloaded via the USB port to the included Easyprot software for reporting.

An optional internal tanδ is available that automatically evaluates results for PE, XLPE and PILC type cables based on insulation and selected compliance standard. Combined with the optional ESG NT step voltage probe, the VLF45 can pinpoint sheath faults.

VLF Sine Wave 45 kV Datasheet

Cosine Rectangular Cable Testing

• VLF, DC, and sheath fault testing in one device
• Portable thanks to two-part construction
• High test capacitance
• Integrated discharge system
• Reporting

The VLF CR-28, VLF CR-40, and VLF CR-60 are portable, high-performance, and energy-efficient cosine rectangular VLF cable test systems.

Design for testing cables with 0.1 Hz cosine-rectangular voltage according to IEC, IEEE, and CENELEC standards, these test systems are ideal for testing the dielectric strength of cables and joints after installation or repair.

These test systems have high test capacities and yet manage to be compact, because of the patented voltage wave-shape and the power recycling during polarity reversal. Aside from cable and sheath testing, the test systems can also be used for the precise pinpointing of sheath faults (in combination with a step-voltage probe).

There are three portable systems available, each with different voltage levels (28, 40, and 60 kVrms):

• VLF CR-28 up to cable series 15 kV
• VLF CR-40 up to cable series 23 kV
• VLF CR-60 up to cable series 35 kV

 VLF CR Series Datasheet