Table of Contents

FOREWORD
INTRODUCTION
1 Scope
2 Reference documents
3 Definitions
4 General
5 Protection principles
    5.1 General
    5.2 Zoning
    5.3 Protection against radiated disturbance
    5.4 Protection against conducted disturbance
    5.5 Wiring and installation guidelines
          5.5.1 Points of entry
          5.5.2 Wiring concepts
          5.5.3 Cables
    5.6 Relation between HEMP and lightning protection principles
          5.6.1 HEMP and lightning sources
          5.6.2 HEMP and lightning protections
          5.6.3 Discussion on the two types of environment
6 Component selection
    6.1 Selection of circuit components
    6.2 Selection of protective devices against radiated disturbance
    6.3 Selection of protective devices against conducted disturbance
          6.3.1 General
          6.3.2 Device categories
          6.3.3 Protection of typical line interfaces
7 Protection concepts
    7.1 General considerations
    7.2 Topological considerations
    7.3 Definition of protection concepts
          7.3.1 Building protection concepts
          7.4.2 Protection concepts for shielded enclosures
8 Comparison of protection measures against conducted disturbances due
    to HEMP and lightning electromagnetic pulse (LEMP)
    8.1 General
    8.2 Peak current
    8.3 Maximum di/dt
    8.4 Maximum du/dt
    8.5 Integral i x dt
    8.6 Integral i2 x dt
    8.7 Time to half-value
    8.8 Conclusions on the comparisons between HEMP and LEMP protection
Annex A Early-time HEMP and lightning radiated environments
Annex B Arrangement showing the use of a distribution transformer with a
        primary delta winding
Annex C Transmission characteristics of protective measures
Figure 1 - Example of penetration of radiated and conducted disturbances
           through a two-barrier protection
Figure 2 - Voltage and current flowing through a gas arrester during a
           surge event
Figure 3 - Concepts for wiring systems
Figure 4 - Typical protection circuit
Figure 5 - Solution to prevent surge current from radiating into
           protected area
Table 1 - Building protection concepts
Table 2 - Protection concepts for shielded enclosures
Table 3 - Lightning and HEMP current waveforms which can be used
          for tests

Abstract

Gives elements for the design of an adequate protection for civil facilities against the electromagnetic pulse due to a high altitude nuclear explosion,

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	International Electrotechnical Committee
Pages
ISBN
Committee	SC 77C