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为了实现高空核电磁脉冲(HEMP)的有效防护,选取一款典型的以太网现场总线系统(EtherCAT)从站通信模块,对其进行HEMP传导注入试验。研究了该类装置对HEMP的敏感度及损伤累积效应影响,选取了适用于网络端口的防护器件,研究了其对HEMP的响应特性,并提出了端口防护方案。通过试验得出:被测端口对HEMP传导注入较为敏感,单次脉冲注入情况下的损毁阈值电压约为450.1V,10次脉冲注入情况下的损毁阈值电压约为273.5 V,脉冲次数对其具有明显的累积效应;该防护器件在单次脉冲注入时损毁阈值电压为9.67 k V,10次脉冲时的损毁阈值电压为8.97 kV;将该防护器件并联至受试模块注入端口后,受试端口可保证在注入3 kV HEMP电压峰值下网络系统仍不受损伤。研究结果表明,防护后的以太网从站通信模块的损毁阈值电压可提升至3 kV以上。
In order to effectively protect the high-altitude nuclear electromagnetic pulse (HEMP), a typical Ethernet fieldbus system (EtherCAT) slave communication module was selected for HEMP conduction injection test. The influence of such devices on the sensitivity and damage accumulation effect of HEMP was studied. The protective devices suitable for network ports were selected, their response to HEMP was studied, and the port protection scheme was proposed. The results show that the port under test is sensitive to HEMP conduction injection, the damage threshold voltage is about 450.1V with single impulse injection, and the damage threshold voltage is about 273.5 V with 10 impulse injection. The protective device has a breakdown voltage of 9.67 kV at single pulse injection and a damaged threshold voltage of 8.97 kV at 10 pulses. After the protection device is connected in parallel to the test module injection port, the test port This will ensure that the network will not be damaged until the 3 kV HEMP voltage is injected. The results show that the damaged threshold voltage of the protected Ethernet slave communication module can be increased to more than 3 kV.