This part of IEC61000 specifies the immunity requirements, test methods, and range of recommended test levels for equipment subjected to damped oscillatory magnetic disturbances related to medium voltage and high voltage sub-stations. The test defined in this standard is applied to equipment which is intended to be installed in locations where the phenomenon as specified in Clause4 will be encountered. This standard does not specify disturbances due to capacitive or inductive coupling in cables or other parts of the field installation. IEC61000‑4‑18 , which deals with conducted disturbances, covers these aspects. The object of this standard is to establish a common and reproducible basis for evaluating the performance of electrical and electronic equipment for medium voltage and high voltage substations when subjected to damped oscillatory magnetic fields. The test is mainly applicable to electronic equipment to be installed in H.V. sub-stations. Power plants, switchgear installations, smart grid systems may also be applicable to this standard and may be considered by product committees. NOTE As described in IECGuide107 , this is a basic EMC publication for use by product committees of the IEC. As also stated in Guide107, the IEC product committees are responsible for determining whether this immunity test standard is applied or not, and if applied, they are responsible for determining the appropriate test levels and performance criteria. TC 77 and its sub-committees are prepared to co-operate with product committees in the evaluation of the value of particular immunity test levels for their products. This standard defines: a range of test levels; test equipment; test setups; test procedures.