Protection Functions
PRS-7367 165
(BPAS4). In these two operation modes, busbar 1 and 2 alternate each other in a hidden manner,
that means, CB03 alternates CB01 and CB02.
The operation process of BPAS3 is tripping CB01 and closing CB03 when busbar 1 is in dead
voltage status;
The operation process of BPAS4 is tripping CB02 and closing CB03 when busbar 2 is in dead
voltage status.
Table 1 AC component and input value to be employed for BPAS
Input AC component
(A total of 13)
Phase to phase voltages of busbar 1 and 2, i.e.
Uab1, Ubc1, Uca1 and Uab2, Ubc2, Uca2;
Line voltages of incoming line 1 and 2, i.e. UL1 and
UL2;
Phase current of incoming line 1 and 2, i.e. IL1 and
IL2;
Phase current of section, i.e. Ia, Ib and Ic
Input switching value
(A total of 10)
CB01_Open, CB02_Open, CB03_Open;
CB01_Aft_Cls, CB02_Aft_Cls, CB03_Aft_Cls;
BPAS_Blk, BPAS_Ena;
Trans01_Op, Trans02_Op
3.34.2 Operation principle
3.34.2.1 Public Part: Live voltage, dead voltage and live current conditions
1) There are two criteria for live busbar:
Any of the bus phase to phase voltage UAB, UBC and UCA is greater than [Busbar
voltage setting value]. It is generally used in action logic to judge the voltage of the
standby bus, or when the bus voltage is below the voltage constant value of 15s
discharge condition.
All of the bus phase to phase voltages UAB, UBC and UCA are greater than [Busbar
voltage setting value]. Generally used in the charging conditions of the bus voltage
condition judgment.
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