Triple frequency generator device usually consists of three single-phase transformers



The triple frequency generator device (also known as triple frequency induced withstand voltage test device) is a core testing equipment specifically used for induced withstand voltage tests on transformers, voltage transformers, and other equipment in the power system.

Its core function is to apply a higher test voltage by increasing the power frequency (raising the 50Hz power frequency to 150Hz) without damaging the core of the tested object, thereby accurately assessing the longitudinal insulation strength between turns, layers, sections, and phases of the winding of power equipment.

Currently, triple frequency generators on the market are mainly divided into two categories: traditional electromagnetic type and modern electronic type (multi-frequency). The following is a detailed comparison and introduction of the two:

⚡ Core Working Principle

Traditional electromagnetic type (triple frequency): Based on the principles of electromagnetic induction and harmonic superposition. It usually consists of three single-phase transformers (or adopts a three-core five-limb structure), with the primary side connected in a star configuration and the secondary side connected in an open delta. By raising the voltage to saturate the core magnetic circuit, utilizing the nonlinear characteristics of the silicon steel sheet magnetization curve, the zero-sequence third harmonic (150Hz) is induced and superimposed on the secondary side, thereby outputting triple frequency voltage.

Modern electronic type (multi-frequency): Adopts advanced power electronics technology and full digital control (such as variable frequency regulators, DSP chips). It abandons the bulky core saturation principle and directly synthesizes and outputs test voltages at multiple frequencies such as 50Hz, 100Hz, 150Hz, 200Hz through digital technology, with higher waveform quality.