Research on self-powered short-circuit fault alarming system in power grid

摘要

Aim to the existing shortages of fault monitoring technology in power grid, this paper presents a kind of self-powered short-circuit fault detection system based on current transformer (CT) to acquire power and GSM module to realize fault wireless remote alarming. The system utilizes the energy generated at the moment of short-circuit fault in grid, Combing the switching power supply technology, CT couples short-circuit energy to the secondary-side to supply power for the entire system, it can achieve zero power consumption; The ultra low power microprocessor controls the GSM wireless communication module to send fault signal to the monitoring terminal; super capacitor (SC) as the uninterrupted power supply, when the fault signal is to be sent, the stored energy is released instantaneously. The system eliminates the dependence on the dry battery and display screen, short-circuit fault information can be obtained in a distance of thousands of miles in time. At last, experiment results verify that the designed system can detect short-circuit fault quickly and effectively.