Protection Functions
170 PRS-7367
2) Backup power automatic switching device is enabled, that means, the setting value
BPAS1_Ena is “enabled”, and the binary input BPAS_Ena is “Enable”;
3) Operating and backup breakers are in normal position, that means, CB01 and CB03 are
at close position, while CB02 is at open position;
4) CB01 and CB03 are in after-close status. If there's no CB after-close binary inputs, the
criterion could be disabled through setting CB_Aft_Cls_Ena.
5) Both busbar 1 and busbar 2 are in good condition, i.e. meeting live voltage condition;
Backup power automatic switching does not operate unless the device is charged for 15s
after all charge conditions are satisfied.
Operation Process
The diagrams of the operation process of BPAS1 is shown in Figure 3.34-9.
Figure 3.34-9 Diagram of the operation process of BPAS1
The operation processes of BPAS1 and BPAS2 are similar, so take BPAS1 for example.
After BPAS1 is completed charged, if the line voltage of busbar 1 and 2 is less than
Bus_Dead_Vol, current of operating incoming line 1 is less than L1_Live_Cur, and the line voltage
of incoming line 2 is more than L2_Live_Vol if the setting L2_Vol_Ena is “Enable”, backup power
automatic switching device will send “BPAS Trip CB01” signal and transmit CB01 tripping pulse
after CB01_Trip_T. The backup power automatic switching device will intertrip the load of busbar 1
meanwhile if the setting Intertrip_Ena is “Enable”. Once CB01 fails to operate within 5s after the
release of “BPAS Trip CB01” signal, terminate BPAS1 logic and discharge BPAS1, and then the
device would send “BPAS trip CB fail” signal;
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