Selecting Proper Corona Protection Using E-Field Modelling by Ed Niedospial

E-field modeling of insulator and hardware has become a valuable tool to determine proper corona protection for a transmission assembly before submitting for laboratory testing or field installation and energization. One of the benefits is that multiple combinations of corona rings, shields, hardware and insulators can be tried to achieve desired customer requirements, whether for new projects or if ‘troubleshooting’ applications that may have insufficient corona protection. This presentation will explore how this process is accomplished using a case study involving a 138 kV braced post application originally designed and applied without corona rings but which no longer met today’s corona performance criteria