A Novel Technique for Preventing Current Method Electricity-stealing

摘要

Nowadays, current method electricity-stealing is difficult to prevent. The novel technique proposed improves the structure of current coupling device in single-phase or three-phase electric power measuring equipment, and two high-frequency coupling windings are added to each current coupling device. High-frequency detection signals generated in electric power measuring equipment are injected into current transformer secondary side. At the same time, the advanced ARM microprocessor is adopted for sampling the high-frequency signals coupled back and real-time computation. It can recognize the normal, opened or shorted state of current transformer secondary side circuit correctly and prevents current method electricity-stealing effectively.