IEC 61643-12 Ed.2:2018 is an important standard in the field of electrical engineering. It specifically relates to the protection against lightning surge voltages in low-voltage power supply systems. This standard sets out the requirements for surge protective devices (SPDs) and their testing methods. In this article, we will explore the key aspects of IEC 61643-12 Ed.2:2018.
of IEC 61643-12 Ed.2:2018
The second edition of IEC 61643-12 was published in 2018 as an update to the first edition. This standard provides guidelines for the selection, installation, operation, and maintenance of SPDs. It covers both the type and performance requirements of SPDs that are used in AC power supply systems up to 1,000 V and DC power supply systems up to 1,500 V.
IEC 61643-12 Ed.2:2018 emphasizes the importance of protecting electronic equipment from transient overvoltages caused by lightning strikes or other sources. It specifies the necessary characteristics of SPDs to ensure effective protection. The standard also includes requirements for coordination with other protective devices within the power distribution system.
Key Features and Requirements
The second edition of IEC 61643-12 introduces several new features and requirements compared to its predecessor. Firstly, it provides enhanced guidance on selecting SPDs based on risk assessment and the Lightning Protection Level (LPL) concept. LPL determines the level of protection required depending on the consequences of failure.
This edition also introduces a classification scheme for SPDs based on their performance characteristics. Class I, II, and III SPDs are defined based on their capability to handle different surge currents and associated protection levels. This classification aids in selecting appropriate SPDs for specific applications.
Furthermore, IEC 61643-12 Ed.2:2018 specifies specific requirements for the installation of SPDs to ensure optimum performance. It covers aspects such as the distance between SPDs and equipment, the routing of conductor connections, and the use of appropriate grounding techniques.
Conclusion
IEC 61643-12 Ed.2:2018 plays a crucial role in ensuring the reliable operation of electrical systems by protecting them from lightning surge voltages. Compliance with this standard is essential for designers, installers, and users of electrical installations to minimize the risk of damage caused by transient overvoltages. By following the guidelines provided in this standard, one can effectively select and install SPDs that meet the necessary performance requirements.
Nina She