A novel anti-theft and detection method of street lamp power cables

A novel anti-theft and detection method of street lamp power cables is presented in the paper. An tunable capacitor is parallell connection with the single-phase bus on the transformer´outlet side. The frequency which makes the input impedance´s imaginary part zero can be found by injecting a ariable Frequency Constant signal. The number of lamp which connect to the street lamp system can be calculated. Whether the cable is stolen or not can be judged, and the fault location can be calculated. The novel method is no necessary to add equipment to the end of street lamp power cables, and it´s not influenced by power transformer types and the cable length. Simulation experimentations are carried out. Simulation results show that the method is simple and correct.