GB/T 30556.5-2025 Electromagnetic compatibility—Installation and mitigation guidelines—Part 5:Specification of protective devices for HEMP conducted disturbance

Scope

This document details how to specify conductive interference protection devices used for HEMP protection. The purpose of this document is to ensure consistency among existing or future specifications issued by manufacturers of protection devices, electronic equipment manufacturers, official agencies, and other end users. The performance requirements for protection devices are provided in subsequent national standards. This document includes current protection devices used on signal lines and low-voltage power lines (with a nominal AC voltage of less than 1 kV) to prevent HEMP transient induction. The general information on protection devices also applies to high-voltage lines. However, in these cases, additional requirements regarding the protection level of existing lightning arresters (especially gapless metal oxide lightning arresters) are under consideration. Generally, the focus is on HEMP-related parameters, which are related to the rapid changes in electromagnetic fields, voltage (u), and current (i) as a function of time. For basic specifications, refer to other relevant standards not limited to the HEMP phenomenon (see Appendix E). When these standards do not adequately address the requirements of modern electronic equipment, additional specifications can be modified or expanded based on non-HEMP-related standards.

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