BS EN IEC 61000-4-18:2019

1   Scope This Part of IEC 61000 focuses on the immunity requirements and test methods for electrical and electronic equipment, under operational conditions, with regard to:

a) repetitive slow damped oscillatory waves occurring mainly in power, control and signal cables installed in high voltage and medium voltage (HV/MV) substations;

b) repetitive fast damped oscillatory waves occurring mainly in power, control and signal cables installed in gas insulated substations ( GIS ) and in some cases also air insulated substations ( AIS ) or in any installation due to high-altitude electromagnetic pulse ( HEMP ) phenomena.

The object of this document is to establish a common and reproducible reference for
  evaluating the immunity of electrical and electronic equipment when subjected to damped
  oscillatory waves on supply, signal, control and earth  ports . The test method documented in this Part of [IEC 61000](/search?q=IEC%C2%A061000) describes a consistent method to assess the immunity of an equipment or system against
  a defined phenomenon. 

    NOTE  As described in IEC Guide 107, this is a basic  EMC  publication for use by product committees of the IEC. As also stated in Guide 107,
     the IEC product committees are responsibl...