Substation Electromagnetic Interference Part 1: Characterization and Description of the Transient EMI Problem

The problem of electromagnetic interference with automation and control equipiment in power substations is defined in detail. Instrumentation techniques for measuring electric and Tmagnetic fields are reviewed and actual field data is presented. Several approaches to equipment protection and susceptibility testing are presented from the utility perspective. Examples of transient EHI and conducted interference are included and recommendations are miade as to equipment hardening and design techniques.