The triple frequency generator device is often referred to as the triple frequency induced withstand voltage test device in the power industry.



It is key equipment specifically used for induced withstand voltage tests on iron-core electrical equipment such as transformers and voltage transformers (PT). Since directly applying twice the rated voltage to a transformer at power frequency (50Hz) would cause saturation of the iron core flux, a surge in excitation current, and thus burn out the equipment, it is necessary to increase the power frequency (usually 150Hz, i.e., triple frequency) to keep the flux density within allowable limits, thereby applying high voltage without saturation to test the insulation strength between turns, layers, and sections of the equipment. Combining technological developments and industry standards from 2025-2026, the following is a detailed guide for this device: 1. Core Working Principle: Frequency conversion principle: using power electronics technology (IGBT inverter) to convert the input 50Hz power frequency supply into a 150Hz (or adjustable 100Hz-200Hz) three-phase or single-phase power supply. Derivation of the flux formula: according to the formula