Example Calculations For Busbar High-Impedance Differential Protection; Differential Protection - ABB RELION REX640 Technical Manual

Section 4
Protection functions
4.3.6.7
696
in any busbar section, the difference current is no longer zero and the protection
operates.
GUID-9EB74EDD-C063-477D-BDAF-006AF2795BEC V1 EN
Figure 387: Differential protection on busbar with bus coupler (Single-phase
representation)

Example calculations for busbar high-impedance differential protection

The protected object in the example for busbar differential protection is a single-bus
system with two zones of protection.
1MRS759142 C
REX640
Technical Manual