Over-voltage monitoring system based on photoelectric sensor array

Aiming at the shortcomings of existing over-voltage monitoring system, such as modifications of primary equipment and poor anti-interference performance, a method of applying sensor array to monitor over voltage is proposed and an over-voltage monitoring system based on photoelectric sensor array is established. Firstly, the hardware structure of this monitoring system is introduced. Secondly, theoretical deduction shows that the electric field generated by long straight overhead line system has the properties of linearity and superposition. Then, a general algorithm is introduced based on Discrete Fourier Transform (DFT) to separate the effects of the field generated by different voltages and the mathematical model that is applicable to parallel overhead lines system with arbitrary number could be built for the measurement of the over-voltage using photoelectric sensor array. According to the physical meaning of the coefficients in the model, two solutions are given with numerical simulation and experimental standardization respectively. Finally, the application of the measuring system is illustrated.