What is IEC 61000-4-9:2019?

IEC 61000-4-9:2019 is an international standard that specifies the immunity requirements and test methods for electrical and electronic equipment when subjected to repetitive damped oscillatory disturbances induced by power lines. It is part of the IEC 61000 series, which addresses electromagnetic compatibility (EMC) – the ability of electrical and electronic equipment to function properly in its electromagnetic environment and not interfere with other equipment.

Background

In today's digital age, we rely heavily on various electrical and electronic equipment such as computers, smartphones, and appliances. These devices generate electromagnetic energy, and at the same time, they can also be affected by external electromagnetic disturbances. The objective of standards like IEC 61000-4-9:2019 is to ensure that such equipment can operate without any issues in the presence of these disturbances.

Prior to the revision of the standard in 2019, the previous version was published in 1992. The update took into account advancements in technology and the changing electromagnetic environment. The revised edition provides more detailed test specifications and stricter criteria for evaluating the immunity of equipment.

Scope and Application

IEC 61000-4-9:2019 applies to electrical and electronic equipment intended for use in residential, commercial, and industrial environments. It covers both fixed installations and portable devices. The standard addresses disturbances caused by power lines up to the highest voltage level specified by the responsible regulatory body.

The scope of the standard ranges from low-frequency disturbances, such as those created by electric power transmission and distribution systems, to higher frequency disturbances arising from switching operations in power electronic converters or inductive loads. The goal is to ensure adequate levels of immunity against these disturbances.

Test Methods and Criteria

The standard outlines specific test methods to evaluate the immunity of equipment. It covers parameters such as voltage dips, short interruptions, and voltage variations. It also provides guidelines for measuring the performance of equipment during these tests.

During testing, equipment is subjected to a series of disturbances with varying characteristics. The performance of the equipment is assessed based on its ability to withstand these disturbances without malfunctioning or sustaining damage above specified limits. This evaluation is conducted using both qualitative and quantitative measures.

Equipment that complies with the requirements outlined in IEC 61000-4-9:2019 can be considered as having an acceptable level of immunity against repetitive damped oscillatory disturbances induced by power lines. Compliance with this standard helps ensure reliable operation and better interoperability of electrical and electronic equipment within the electromagnetic environment.