The most critical update is the complete revision to comply with and IEC 61439-2 . Unlike the old IEC 60439, which allowed for "design verification by comparison," the new standard requires specific design verification tests (temperature rise, short-circuit withstand, insulation coordination). The 12th edition provides the calculation methods and tables to perform these verifications without destructive testing.
Configuring overcurrent, distance, and differential protection. ABB Switchgear Manual 12 Ed pdf
: Protection relays, digital control systems (including fibre-optic integration), and station automation. The most critical update is the complete revision
ABB 12 kV Switchgear Manual | PDF | Switch | Fuse (Electrical) and differential protection. : Protection relays