1. International standard IEC 60044-8: ‘Instrument transformers – part 8: electronic current transformers’, 2002
2. IEEE C57.13-2008: ‘IEEE standard requirements for instrument transformers’, 2008
3. IEEE C57.13.6-2005: ‘IEEE standard for high-accuracy instrument transformers’, 2005
4. IEEE C37.110-1996: ‘IEEE guide for the application of current transformer used for protective relaying purposes’, 1996
5. Rogowski coils suit relay protection and measurement ~of power systems\