CYG PRS-7367 - Page 184

Protection Functions
176 PRS-7367
3.34.2.5 Backup power automatic switching of busbar 2 (BPAS4)
Discharge Conditions
The logic diagram of the discharge condition of BPAS4 is shown in Figure 3.34-17.
1
1
1
SIG
BPAS4_Trip_Fail
SIG
BPAS4_Close_Fail
SIG
BPAS_Blk
BPAS4_Ena=0
SET
CB_Aft_Cls_Ena=1
SET
SIG
CB01_Aft_Cls
SIG
CB02_Aft_Cls
SIG
CB01_Pos_Err
SIG
CB02_Pos_Err
SIG
CB03_Open
SIG
Trans01_Op
SIG
Trans02_Op
1
&
1
SIG
BPAS4_DisCharge
SIG
BPAS_Ena
SIG
Bus_Loss_Vol
SIG
BPAS4_Success
Figure 3.34-17 Diagram of the discharge condition of BPAS4
Charge Conditions
The logic diagrams of the charge condition of BPAS3 is shown in Figure 3.34-18.
0ms
15s
&
&
1
&
&
SIG
BPAS4_Chg_Ok
BPAS3_Ena=1
SET
BPAS3_DisCharge
SIG
CB01_Open
CB02_Open
CB03_Open
CB_Aft_Cls_Ena=0
SET
CB01_Aft_Cls
CB02_Aft_Cls
AND_Bus1_Live_Vol
AND_Bus2_Live_Vol
SIG
SIG
SIG
SIG
SIG
SIG
SIG
SIG
BPAS_Ena
SIG
Figure 3.34-18 Diagram of the charge condition of BPAS4
Operation Process
The diagrams of the operation process of BPAS4 is shown in Figure 3.34-19.