VLF Measurements on Medium Voltage Cables
VLF (Very Low Frequency) Testing on Medium Voltage Cables
VLF (Very Low Frequency) testing is one of the most effective and internationally recognized methods for testing the insulation of Medium Voltage cables. Through these measurements, we assess the electrical withstand capability and the general condition of the insulation, identifying weak points early before they lead to failure.
At SCANTEK, we perform certified VLF tests using state-of-the-art equipment, in full compliance with IEC and IEEE standards and modern network requirements.
Why is VLF Testing Important?
VLF measurements allow for:
- Detection of insulation defects before they evolve into faults.
- Quality assurance of new installations prior to initial energization (commissioning).
- Assessment of aged cables to prevent unplanned outages.
- Lifespan prediction of the installed cabling.
How the Test is Performed
The test applies a very low frequency alternating electrical field (typically 0.1 Hz), allowing for safe and reliable stress on the insulation without causing thermal or electrical overload, as is often the case with other methods.
During the process:
- Insulation withstand capability under voltage is verified.
- Electrical responses of the cable are recorded.
- Signs of degradation, moisture, or aging are identified.
Benefits for the Facility Owner
- Avoidance of sudden faults and operational downtime.
- Certified technical assessment of the cabling.
- Improved maintenance planning and investment strategy.
- Complete documentation with a detailed results report.
In cases where VLF measurements indicate failure or insulation degradation, ScanTek proceeds to Medium Voltage cable fault location, ensuring targeted and immediate network restoration.
Ensure maximum network reliability — without the unexpected.
SCANTEK is the specialized team that locates, diagnoses, and documents every fault with absolute precision. Contact our team today for an immediate assessment and clear next steps for your installation.