why isolation transformer is used in vfd?

An isolation transformer is used in a Variable Frequency Drive (VFD) to provide electrical isolation between the VFD and the power supply. This isolation helps to protect sensitive equipment from voltage spikes and electrical noise, enhancing system reliability. Additionally, it can reduce harmonics and improve power quality by decoupling the VFD from the supply network. Overall, using an isolation transformer in a VFD setup improves safety and performance.