IEC 61000-2-10-2021 pdf free download – Electromagnetic compatibility (EMC) – Part 2-10: Environment – Description of HEMP environment – Conducted disturbance.
This part of IEC 61000 defines the high-altitude electromagnetic pulse (HEMP) conductedenvironment that is one of the consequences of a high-altitude nuclear explosion.
Those dealing with this subject consider two cases:
– high-altitude nuclear explosions;
– low-altitude nuclear explosions.
For civil systems the most important case is the high-altitude nuclear explosion. In this case,the other effects of the nuclear explosion such as blast, ground shock,thermal and nuclearionizing radiation are not present at the ground level.
However, the electromagnetic pulse associated with the explosion can cause disruption of, anddamage to, communication, electronic and electric power systems thereby upsetting the stabilityof modern society.
The object of this document is to establish a common reference for the conducted HEMPenvironment in order to select realistic stresses to apply to victim equipment to evaluate theirperformance.
2Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies.For undated references,the latest edition of the referenced document (including anyamendments) applies.
IEC 61000-2-9，Electromagnetic compatibility (EMC) – Part 2: Environment – Section 9:Description of HEMP environment- Radiated disturbance
IEC 61000-4-24，Electromagnetic compatibility (EMC) – Part 4-24: Testing and measurementtechniques -Test methods for protective devices for HEMP conducted disturbance
3Terms and definitions
For the purposes of this document, the following terms and definitions apply.
lSo and lEc maintain terminological databases for use in standardization at the followingaddresses:
IEC Electropedia: available at http://www.electropedia.orgl
Iso Online browsing platform: available at http:.//www.iso.orglobp
3.1
angle of elevation
angle measured in the vertical plane between a flat horizontal surface such as the ground and the propagation vector
SEE: Figure 1 .
3.2
azimuth angle p
angle between the projection of the propagation vector on the ground plane and the principalaxis of the victim object
Note 1 to entry: lt is the z axis for the transmission line of Figure 1.3.3
composite waveform
waveform which maximizes the important features of a waveform
3.4
coupling
interaction of the HEMP field with a system to produce currents and voltages on system surfacesand cables
Note 1 to entry: Voltages result from the induced charges and are only defined at low frequencies with wavelengthslarger than the surface or gap dimensions
3.5
direction of propagation of the electromagnetic wave
direction of the propagation vector k, perpendicular to the plane containing the vectors of theelectric and magnetic fields
Note 1 to entry: See Figure 2.
4General
A high-altitude (above 30 km) nuclear burst produces three types of electromagnetic pulseswhich are observed on the earth”s surface:
1) early-time HEMP (fast);
2) intermediate-time HEMP (medium);
3) late-time HEMP(slow).
Historically most of the interest has been focused on the early-time HEMP which was previouslyreferred to simply as HEMP.Here the term high-altitude EMP or HEMP will be used to includeall three types. The term nuclear electromagnetic pulse (NEMP) covers many categories ofnuclear EMPs including those produced by surface bursts (source region EMPs(SREMPs)) orcreated on space systems (system generated EMPs SGEMPs)).
Because the HEMP is produced by a high-altitude detonation，other nuclear weaponenvironments such as gamma rays, heat and shock waves at the earth’s surface are notobserved at the earth’s surface.HEMP was reported from high-altitude nuclear tests in theSouth Pacific by the U.S. and over the uSSR during the early 1960s，producing effects onelectronic equipment on the ground far from the burst location.
This document presents the conducted HEMP environment induced on metallic lines,such ascables or power lines,external and internal to installations, and external antennas.IEC 61000-2-10 pdf download.