IEC 61000-6-4-2018 pdf download.Electromagnetic compatibility (EMC) – Part 4-8: Testing and measurement techniques – Power frequency magnetic field immunity test.
This part of IEC 61 000 relates to the immunity requirements of equipment, only under operational conditions, to magnetic disturbances at power frequencies 50 Hz and 60 Hz related to:
– residential and commercial locations;
– industrial installations and power plants;
– medium voltage and high voltage sub-stations.
The applicability of this standard to equipment installed in different locations is determined by the presence of the phenomenon, as specified in Clause 4. This standard does not consider disturbances due to capacitive or inductive coupling in cables or other parts of the field installation.
Other IEC standards dealing with conducted disturbances cover 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 household, commercial and industrial applications when subjected to magnetic fields at power frequency (continuous and short duration field).
The standard defines:
– recommended test levels;
– test equipment;
– test set-up;
– test procedure.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60050(1 61 ), International Electrotechnical Vocabulary (IEV) – Chapter 161: Electro- magnetic compatibility
3 Terms and definitions
For the purposes of this document the following terms and definitions apply to the restricted field of magnetic disturbances as well as the terms and definitions from IEC 60050(1 61 ) [IEV].
3.1 current distortion factor
ratio of the root-mean square value of the harmonics content of an alternating current to the root-mean square value of the fundamental current
3.2 EUT equipment under test
3.3 inductive coil
conductor loop of defined shape and dimensions, in which flows a current, generating a magnetic field of defined constancy in its plane and in the enclosed volume
3.4 inductive coil factor
ratio between the magnetic field strength generated by an inductive coil of given dimensions and the corresponding current value; the field is that measured at the centre of the coil plane, without the EUT
3.5 immersion method
method of application of the magnetic field to the EUT, which is placed in the centre of an inductive coil (see Figure 1 )
3.6 proximity method
method of application of the magnetic field to the EUT, where a small inductive coil is moved along the side of the EUT in order to detect particularly sensitive areas
3.7 ground (reference) plane
GRP flat conductive surface whose potential is used as a common reference for the magnetic field generator and the auxiliary equipment (the ground plane can be used to close the loop of the inductive coil, as in Figure 5)
[IEV 1 61 -04-36, modified]
3.8 decoupling network, back filter
electrical circuit intended to avoid reciprocal influence with other equipment not submitted to the magnetic field immunity test
4 General
The magnetic fields to which equipment is subjected may influence the reliable operation of equipment and systems.
The following tests are intended to demonstrate the immunity of equipment when subjected to power frequency magnetic fields related to the specific location and installation condition of the equipment (e.g. proximity of equipment to the disturbance source).
The power frequency magnetic field is generated by power frequency current in conductors or, more seldom, from other devices (e.g. Ieakage of transformers) in the proximity of equipment.
As for the influence of nearby conductors, one should differentiate between:
– the current under normal operating conditions, which produces a steady magnetic field,with a comparatively small magnitude;IEC 61000-6-4 pdf download.