When there are harmonic components in the power system and user loads, the harmonic voltage will generate additional harmonic current components in the isolation transformer coils, causing the isolation transformer to overload and overheat, reducing its operating life, and even burning out in a short period of time; The K-factor isolation transformer is designed based on the user's power supply quality and harmonic components in the load, taking into account nonlinear loads and the impact of harmonics on the performance of the iron core and coil. It is designed and manufactured according to American standards, which can effectively ensure the reliable operation of the isolation transformer.