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IEC SC 77C has been developing high-power electromagnetic (HPEM) standards and publications since 1992. Most of the documents have dealt with the high-altitude electromagnetic pulse (HEMP) and intentional electromagnetic interference (IEMI). This paper briefly reviews the publications prepared in the past and discusses in some detail the three documents to be published in 2009.
In this presentation, the generation of high-altitude electromagnetic pulse (HEMP), its historical evidence and threat, and the different phases of HEMP (early-time, intermediate and late-time) are discussed.
This paper presents a new model of how the impedance of ground rods varies with the time-dependent level of the current flowing in the ground rod and the soil itself. This model is based on evaluations of measurements previously performed for breakdown levels in soil, the propagation velocity of soil arcs, and the resistance per unit length of an arc as a function of the current amplitude.
High power electromagnetic (HPEM) transient phenomena have been defined in the International Electrotechnical Commission (IEC) and the IEEE. Some of the typical threats considered include the electromagnetic fields from near lightning encounters, from electrostatic discharges, from radio transmitters, and from radars to mention a few. In addition, there are electromagnetic threats produced by nuclear...
A calculation model to estimate data channel degradation due to the influence of periodically repeating voltage pulses is presented in this paper. These periodically repeating voltages can be caused by accidental or intentional disturbances that are either injected onto a communications line or coupled to the line by a radiated field. Comparative analysis of the influence of different pulse disturbances...
The International Electrotechnical Commission (IEC) is the principal authority for world standards in electrical and electronics engineering. The IEC technical subcommittee 77C "High power transient phenomena" of technical committee 77 "Electromagnetic compatibility" is preparing standards and technical reports dealing with the High-altitude Electromagnetic Pulse (HEMP) and all...
The CFO voltage and V-t characteristic of 15 kV power distribution insulators are important factors in insulation coordination design of power distribution systems. Insulation designs for distribution feeders are usually based on 1.2/50 mus lightning impulse, while insulator behavior under steep front short duration (SFSD) pulses is not concerned. The generated SFSD impulse in this study has a 60...
The threat of intentional electromagnetic interference (IEMI) has been presented and evaluated in conferences throughout the world. This threat deals with the possibility that intense electromagnetic disturbances may be delivered by criminals or terrorists to the sophisticated electronic systems that are important to our daily lives. This paper provides a summary of the EM threat, a description of...
This paper studies a possible failure process for protection from high level pulses of equipment connected to multiconductor lines, dealing with multi-mode propagation on the lines, and the differences in the velocity of the various propagation modes on the lines. The damage mechanism is that a very short high level pulse may separate, due to the different modal velocities, into several lower level...
TC-5 of the IEEE EMC Society is interested in staying aware of the worldwide work dealing with intentional electromagnetic interference. This paper updates the high-power EM transient phenomena standardization effort underway in Subcommittee 77C of the International Electrotechnical Commission (IEC). This committee is developing environment, protection and testing standards dealing with the disturbances...
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