求翻译：试验用单相变压器是什么意思？

Single-phase transformer test

By using single-phase transformer

Power factor big and small and circuit load nature related, like resistance load and so on incandescent lamp bulb, resistance furnace power factors are 1, generally has the inductive load electric circuit power factor all to be smaller than 1.The power factor is an electrical power system important

Testing single phase transformer

Testing single phase transformer