Power line communication in online detection of cable intermediate joint

The intermediate joint is the weakest part of the insulation in the cable line. How to efficiently and reliably transmit the status information of the cable intermediate joint is the key in the online detection of the cable intermediate joint. By analyzing the characteristics of power line channel and the coupling principle of inductive coupler, this paper builds the power line communication (PLC) system model between cable intermediate joints based on orthogonal frequency division multiplexing (OFDM), considers the influence of inductive couplers at the transmitting end and receiving end, and simulates and analyzes the relationship between different signal-to-noise ratio (SNR) and bit error rate (BER) curve. The simulation results show that the PLC system with coupler can reduce the BER and improve the transmission performance of the system by changing the encoding method and modulation method, which provides a new idea for the effective transmission of online detection data of cable intermediate joint.