Research On Anti-interference Effect Of The Communication Units For Electric Power Secondary Equipment Under The High Power Microwaves

With the rapid development of China’s smart grid,intelligent power equipment have been widely used in the power system,such as microcomputer protection,integrated automation systems and others.The automation level of the power system has been greatly improved,and effectively promoted the development of china’s power grid.But the intelligent power equipments work in complex electromagnetic environment,It also led to a new problems of the electromagnetic compatibility and electromagnetic pulse protection due to the use of a large number of microelectronic components.The intelligent power equipment are highly susceptible to the inf luence of external disturbance sources,these sources include lightning electromagnetic pulses,nuclear electromagnetic pulses,electromagnetic pulses by high-voltage switching operations,and intentional electromagnetic interference and so on.They will led to a negative impact on the normal operation of power equipment,even destroy equipment,and cause electric power accidents.Therefore,it is very important to analyze the characteristics and coupling mechanism of electromagnetic pulse,to study the influence of electromagnetic pulse on power system,to find out the shortcomings of existing anti-jamming measures,and to propose improvement measures,so it has very important practical significance to ensure the safe and stable operation of power grid.The high power microwave pulse was selected as the source of intentional electromagnetic interference,the generation principle,characteristic,coupling mode and damage form of high power microwave pulse are analyzed.The control cable and the converter are selected as the tested product,the control cable is used in the substation,and the converter is used in the communication unit of a certain type of relay protection equipment for the power system.we set up a high power microwave pulse irradiation test system,and carried out the experiment for the control cable and converter.We found out the range of power and field intensity thresholds of the converter when its normal work is affected under the L-band high-power microwave sources by the experiment.We measured the disturbance voltage of the control cable under the L-band high-power microwave sources,and the test and simulation results were compared and analyzed.