Protective device for preventing photovoltaic reverse power transmission

The invention relates to a photovoltaic reverse power transmission prevention protection method and device, whether reverse power transmission exists or not is judged from multiple angles of current, voltage, frequency, illumination intensity and the like by obtaining the electrical quantity of a device to be protected and the illumination intensity of the environment where the device is located, and meanwhile the functions of self-correction and judgment and alarm are achieved. According to the invention, the monitoring accuracy of the secondary component is improved, and problems are pointed out for the maintenance work of on-site operation and maintenance personnel; and the data processing module prompts and detects the element to be measured at present, so that the function of improving the real-time performance and the accuracy of the automatic detection of the secondary element is achieved.