A study on electromagnetic disturbance and immunity of wireless sensor unit in substation

Wireless sensor unit is important part of the Internet of Things, which is responsible for signal acquisition and transmission. In order to ensure reliability and security of the Internet of Things, electromagnetic disturbance issue in substation where wireless sensors are usually located is studied. This paper focuses on the electromagnetic disturbance to wireless sensor unit generated by power system and immunity of wireless sensor unit. Research on characteristics of steady-state electromagnetic disturbance in substations of different voltage levels and of different insulation types is performed, through field measurements. Statistical characteristics of electromagnetic disturbance in frequency domain are obtained, based on extensive field measurement data. Simulation is applied to reveal influence of electromagnetic disturbance to wireless sensor unit. Immunity of wireless sensor unit in the Internet of Things in substation is studied. Experiment indicates that wireless sensor unit is influenced by electromagnetic disturbance and immunity test of wireless sensor unit are performed.