Electrical bare element continuous flow heater and method for controlling the same

摘要

The utility model relates to an electric heater with a continuous bare wire. The electric heater comprises a channel component with a water inlet channel and a water outlet channel. The water inlet channel and the water outlet channel are electricity conductive and are connected with a ground-potential conductive ground. The channel component comprises at least one water guiding channel incapable of conducting electricity, electric bare wire heating devices and an electric controller. The water inlet channel and the water outlet channel are respectively arranged at the ends of the channels. The electric bare wire heating devices are used for heating water flowing through the channel component. The electronic controller is used for adjusting heating power of the bare wire heating devices, and comprises an electric-conductivity measuring device. The electric-conductivity measuring device is used for determining an electric-conductivity value of the water flowing through the channel component. The electronic controller is characterized in that the electronic controller comprises an evaluation unit used for measuring a hypothetic leakage current value on the basis of the electric-conductivity value and at least one preset device parameter limited by structural type, and the controller is set to reduce heating power of the bare wire heating devices as long as the leakage current value exceeds a preset leakage current threshold value.