Static interference is a type of electromagnetic interference, a form of atmospheric interference in radio communications, caused by the accumulation of static charges in precipitation and their subsequent discharge onto antenna elements, grounding systems, or nearby objects.
Static interference in power circuits
Interference in power supply circuits may occur due to voltage drops across the active resistance of the “ground” and “power” buses when direct currents flow through them; the generation of electromotive force (EMF) of self-induction in the power bus circuits when pulse currents flow through them; and “slow” oscillatory processes in the power buses during sudden load current changes.
To minimize “steady” interference, it is necessary to design the “ground” bus so that the voltage drop caused by direct current remains below the predetermined permissible value Uint.perm, calculated based on the required noise immunity of the device.
Static electricity discharges
Static electricity discharges refer to the process of charge equalization between solid bodies, liquid, and gaseous media carrying different electrical charges. These events are usually accompanied by sliding, corona, spark, or lightning-like discharge phenomena; however, equalization can also occur solely due to electrical conductivity at the contact point. When sparks occur, the currents and fields caused by the discharges can damage electronic components, disable devices, or disrupt the operation of electronic equipment.
Related sections:
Atmospheric interference,
Industrial interference,
Multipath interference.