10-4 B30 Bus Differential System GE Multilin10.2 ZONING AND DYNAMIC BUS REPLICA 10 APPLICATION OF SETTINGS1010.2.3 SOUTH BUS ZONEThe South bus differential zone is bounded by the following CTs: CT-2 (if S-2 closed), CT-3 (if S-4 closed), CT-4 (if S-6closed), CT-6 and CT-7. The South bus protection should operate the following breakers: B-2 (if S-2 closed), B-3 (if S-4closed), B-4 (if S-6 closed), B-6 and B-7.Consequently, the second B30 for the South bus should be wired and configured as follows:• CT-2 currents should be configured as SRC 1 and used as the source 1A of the bus differential zone 1 together withthe status of the S-2 switch.• CT-3 currents should be configured as SRC 2 and used as the source 1B of the bus differential zone 1 together withthe status of the S-4 switch.• CT-4 currents should be configured as SRC 3 and used as the source 1C of the bus differential zone 1 together withthe status of the S-6 switch.• CT-6 currents should be configured as SRC 4 and used as the source 1D of the bus differential zone 1 together withthe FlexLogic “On” constant for the status.• CT-7 currents should be configured as SRC 5 and used as the source 1E of the bus differential zone 1 together withthe FlexLogic “On” constant for the status.• The trip signal should be routed directly to the B-6 and B-7 breakers while it should be supervised by the status of S-2,S-4 and S-6 for the B-2, B-3 and B-4 breakers, respectively.Figure 10–4: SOUTH BUS ZONE836734A1.CDRNORTH BUSSOUTH BUSCT-7CT-8B-7B-5B-6CT-5CT-6S-5S-6B-4CT-4S-3S-4B-3CT-3S-1S-2B-2CT-2CT-1B-1C-1 C-2 C-4C-3 C-5
