DEFENSE THREAT REDUCTION AGENCY FORT BELVOIR VA FORT BELVOIR United States
During a high-altitude electromagnetic pulse HEMP event, large voltages and currents will couple to exposed electrical lines. Resulting impacts could occur not only to the large transmission-line infrastructures and components with which those lines interface, but also to the digital control system DCS protective relay equipment and its system-monitoring diagnostic lines. In addition, these currents and voltages will also couple to the DCS equipment that operate power generation plants PGPs. This paper discusses HEMP survivability tests to both types of DCS equipment. This testing included both radiated Military Standard MIL-STD-461, RS-105 and conducted MIL-STD-188-125-1 pulsed-current injection PCI testing. Testing was performed on the equipment mounted in both unprotected and HEMP-protected open-rack configurations.The basic, HEMP rack-level protection with no special-shielded enclosures is almost sufficient to protect many types of DCS equipment to the Department of Defense DoD HEMP threat levels. This type of straightforward protection is recommended for use by power companies to mitigate HEMP susceptibility of their DCS rack-mounted equipment. It is cost effective, but is not low risk per MIL-STD-188-125-1. The Defense Threat Reduction Agency DTRA is developing similar practical HEMP mitigation techniques for other power grid equipment
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Journal of Radiation Effects Research and Engineering , 38, 1, 01 Jan 0001, 01 Jan 0001, This paper was presented at the 36th Annual HEART Conference San Diego, CA, April 8-12, 2019.