Ultra-low Frequency High Voltage Generator



The Ultra-low Frequency High Voltage Generator (VLF) is a precision instrument specifically designed for insulation withstand voltage testing of large-capacity, capacitive test objects (such as long-distance power cables, large generators, and transformers).

In simple terms, it outputs AC high voltage at 0.1Hz (or lower frequency) to replace the traditional 50Hz power frequency withstand voltage test. This method not only reduces the size and weight of the test equipment to 1/500 of traditional equipment but also more effectively detects insulation defects. It is currently the mainstream equipment for preventive and acceptance tests in the power industry.

Combining the latest technical standards and market products from 2025-2026, I have compiled the core principles, application scenarios, and purchasing points for this instrument: