Figure 3.34-13 Diagram of the discharge condition of BPAS3
Discharge conditions normally cover the following items. Backup power automatic switching
would be discharged immediately after any discharge condition is satisfied.
1) Blocking condition is satisfied. Backup power automatic switching is forcibly blocked,
regardless of whether it has been started;
2) Backup power automatic switching is disabled, that means the setting value BPAS3_Ena
is set to “Disabled”, or the binary input BPAS_Ena is “Disabled”;
3) The binary input CB01_Aft_Cls or CB02_Aft_Cls disappears when setting value
CB_Aft_Cls_Ena is set to “Enable”
4) Operation breakers are in error status, that means the current at one phase of incoming
line of operational power supply is more than incoming line no-current setting value, although the
operation breakers are open. The logic diagram of CB position error is shown in Figure 3.34-7;
5) Backup breaker is not in backup status, that means backup breaker has been closed;
6) The time period during which both of operation power supplies do not meet live-voltage
condition is longer than 15s. The logic diagram of busbar voltage loss is shown in Figure 3.34-14;
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