Very Low Frequency Ac Hipot Test Sets - Vlf Series&E-Series Product Catalog

High Voltage, Inc. (HVI) is a global leader in very low frequency (VLF) AC hipot testing solutions, with thousands of units in service across more than 100 countries. The HVI VLF Series and E-Series product lines are designed for field testing of highly capacitive loads, including medium and high voltage power cables, rotating machinery, motors, and generators. Operating at frequencies from 0.1 Hz down to 0.01 Hz, HVI VLF test sets deliver true sinusoidal AC output while requiring significantly less power than conventional 50/60 Hz systems.

The product range includes portable, rugged oil-filled designs with electro-mechanical controls, as well as modern solid-state E-Series units featuring microprocessor control, wireless communication, and E-Link software for remote operation and report generation. HVI VLF systems support AC withstand testing and serve as a voltage source for Tan Delta and partial discharge diagnostics, meeting key IEEE, IEC, and international standards.

Designed and manufactured in the USA, HVI equipment is built for reliability, accuracy, and long-term field performance.