Today, electronic power circuits have improved in providing the required power on the one hand, and on the other hand, they have also increased the harmonic emission, which itself has caused problems such as line losses and excessive heating, etc. One of the issues and problems of power quality in distribution systems And transmission is the issue of harmonics, which has attracted a lot of attention, so that many materials in this regard can be found in various books and articles. Harmonic distortions cause certain problems in power networks. Among these problems, it can be mentioned that the equipment does not function properly, as well as reducing the life and efficiency of the devices. Power quality problems cause discomfort to consumers and economic losses to industries, which harmonics are caused by loads. Non-linearity and power electronic devices are created. These loads usually comprise 40% of the load. Technical losses are usually allowed up to 5%, which automatically increase to more than 7% due to harmonics. Harmonics can be found in electromechanical meters and also some types of meters that They are smart, they influence by using their converters.