1. Ziegler, G.: ‘Numerical differential protection: principles and applications’, 1st(John Wiley & Sons 2005)
2. Applications for SIPROTEC protection relays – 400 kV overhead transmission protection, available at http://siemens.siprotec.de/download_neu/applications/SIPROTEC/english/Appl_13_400kV_OHL_Protection_en.pdf, accessed June 2011
3. B30 Bus Differential System, UR Series Instruction Manual for 5.8x Product Version, Manual P/N: 1601-0109-V1 (GEK-113543), available at http://www.gedigitalenergy.com/products/manuals/b30/b30man-V1.pdf, accessed June 2011
4. IEEE Standard C37.235: ‘IEEE guide for the application of Rogowski coils used for protective relaying purposes’, 2007
5. Rogowski coils suit relay protection and measurement ~of power systems\