Series resonance withstand voltage test device, especially variable frequency series resonance device



is the preferred equipment for AC withstand voltage tests of high-voltage, large-capacity capacitive test objects (such as long cables, GIS, large generators, and main transformers) in the current power system.

Compared with traditional power frequency test transformers, it utilizes the resonance principle, requiring only the active power of the test object's losses (usually 1/Q of the total capacity, where Q is the quality factor) to generate high voltage on the test object. This reduces the equipment size to 1/5-1/10 of traditional equipment, and reduces weight by 60%-80%, making it very suitable for on-site mobile operations.

Combined with the latest group standard T/ZPP 285-2026, which was just implemented on March 20, 2026, and market dynamics, here is an in-depth analysis:

1. Core Working Principle

Resonance condition: adjust the output frequency of the variable frequency power supply