Short-circuit protection method for mine lighting power supply system based on multi-point current and voltage signal
As the long-distance short-circuit faults cannot be accurately and effectively detected in the mine lighting power supply system,we proposed a short-circuit protection method by detecting multi-point current signals at different locations.In this method,the lighting protection circuit is divided into multiple blocks,and the magnitude and phase of the voltage and current will change when different faults occur in different blocks.Based on this,the fault type and the specific location of the short circuit point in a certain block can be determined,and corresponding protection measures can be taken.Compared with the short-circuit detection method of traditional lighting signal comprehensive protection devices,this method greatly improves the accuracy without being affected by the power supply distance.It can locate the short-circuit fault block,and identify the fault type.Meanwhile,a simulation model of the lighting power supply system is built according to the actual situation in the mine to verify the feasibility of the proposed method.
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