earticle

영어

Leakage is one of the most common fault forms of mine low-voltage grid protection. With the continuous increase of automation degree of mine, the leakage protection system of mine low-voltage grid needs to be monitored and managed comprehensively; as a response to this demand, the selective leakage protection system of mine low-voltage grid is explored and studied in this paper from the perspective of practical application based on Internet of Things. In this paper, the design of leakage protection system of mine low-voltage grid is proposed based on the combination of ZigBee protocol the framework of Internet of Things, and the perception layer of Internet of Things is constructed by ZigBee technology to collect and transmit the related data. Meanwhile, the low-voltage leakage fault principle of the mine and the variation law of zero-sequence current and zero-sequence voltage mine are analyzed in this paper; on this basis, a selective leakage protection scheme based on the additional DC power detection and zero-sequence power direction is proposed, in which additional DC power principle is applied to the main feeder switch, the protection principle of zero-sequence power direction is applied to the branch feeder switch, and the branch leakage is interpreted by Fourier algorithm. Through experimental verification, the performance indicators of leakage protection system are consistent with standard requirements, with the small error, which can meet the requirements of the mine grid leakage protection. Internet of Things can realize ZigBee networking and transmit the leakage information of the grid the host computer through ZigBee network.