Also known as Variable Frequency Series Resonance Withstand Voltage Test Device

Series Resonance Test Device, also known as Variable Frequency Series Resonance Withstand Voltage Test Device, is currently the "gold standard" equipment for high-voltage AC withstand voltage tests in the power industry. It utilizes the principle of series resonance between the inductor (L) and the test object's capacitance (C) at a specific frequency to generate high voltage on the test object with relatively small input power. Compared to traditional power-frequency withstand voltage test transformers, it has unparalleled advantages in testing large capacitive test objects such as long cables, GIS (Gas Insulated Switchgear), and large generators. The following is a detailed analysis combined with the industry status in 2025-2026: 1. Core Working Principle The device adjusts the output frequency through a variable frequency power supply, so that the inductive reactance of the reactor in the circuit (