The application discloses an intelligent
voltage fault detecting device, which comprises a
surge voltage detecting module, an operation
overvoltage detecting module, a fault alarm module, a main control module, a communication module and a
power module, wherein the
surge voltage detecting module and the operation
overvoltage detecting module are connected with the same line in a
power grid respectively, the
surge voltage detecting module is connected with the fault alarm module and the main control module by means of high-speed optocouplers respectively, the operation
overvoltage detecting module is connected with the fault alarm module and the main control module by means of optocouplers respectively, and the main control module is connected with a main
station by means of a communicationmodule. The intelligent
voltage fault detecting device can detect an operation overvoltage fault with a small
voltage value and long duration and a transient surge voltage with a great voltage valuein a targeted manner respectively, and activates the fault alarm module by means of the high-speed optocouplers and the transient, so as to identify the overvoltage condition in the line quickly and automatically, thereby being convenient for taking
troubleshooting measures timely, being conductive to shortening the fault detection time and improving the fault detection efficiency.