The official name of the triple frequency generator is usually the triple frequency power supply device for induced withstand voltage test



Triple Frequency Generator, officially known as the triple frequency power supply device for induced withstand voltage test, is a traditional core equipment in the power system specifically used for induced withstand voltage tests on inductive equipment such as transformers, voltage transformers (PT), and current transformers (CT). Its core task is to generate a 150Hz (i.e., 3 times the power frequency of 50Hz) AC power supply to solve the problem of transformer core saturation during high-multiple induced withstand voltage tests at power frequency. Although in 2026, all-digital variable frequency power supplies (SPWM technology) have gradually become mainstream, the triple frequency generator still holds an important place in specific scenarios (such as small and medium-sized substations, maintenance team backup, and occasions where waveform requirements are not extreme) due to its simple structure, strong overload capacity, and low cost. 1. Core working principle: Why must it be "triple frequency"? A. Physical limitation of core saturation The induced electromotive force formula of a transformer is: