VLF Tan Delta Cable Testing Solution — User Manual, Rev 1.0 (September 2026)

About the VLF Tan Delta user manual

This user manual covers the VLF Tan Delta cable testing solution for medium-voltage cables: the two field wiring configurations — main-cable withstand and tan-delta testing, and the dedicated DC connection for outer-sheath testing and fault pinpointing — the automated three-tier tan-delta cycle, the DC and trapezoidal output modes, and the safety requirements for two-person certified operation.

• Test-connection wiring for main-cable withstand and tan-delta
• Outer-sheath DC testing and sheath-fault pinpointing
• Automated tan-delta cycle at 0.5 / 1.0 / 1.5 U0
• Output modes: sine wave, DC and trapezoidal square wave
• Specifications for the VLF-34kV and VLF-45kV units
• Safety, certifications and the field test procedure templates

VLF Tan Delta test set specifications covered

• Output: 0.1 Hz pure sine, with 0.05 Hz and 0.02 Hz selectable
• Voltage: up to 24 kV RMS (VLF-34kV) or 31.8 kV RMS (VLF-45kV)
• DC: ±5 kV, plus trapezoidal square wave with automatic slope matching
• Diagnostics: tan delta measurement and outer-sheath fault location
• Standards: IEEE 400.2 and CENELEC HD 620 S1
• Field workflow: test-connection configurations, data analysis and reporting

About this document

19-page PDF, English-language edition. The document follows the same section order as this page: overview and technology, technical data and specifications, interfaces and protocols, configuration and operation, target applications, then ordering and support.

Who this edition is for

Commissioning engineers and maintenance crews testing medium-voltage cable, including the interpretation of tan delta trends.

Applies to models VLF-34kV and VLF-45kV · Revision rev. 1.0, September 2026.

Product page · User manual (PDF) · No sibling manual is published for this product family.