Figure 3.34-2 Diagram of busbar live voltage logic
2) "Busbar dead voltage” means Uab, Ubc and Uca as phase to phase voltage of busbar are
all less than busbar dead voltage setting value. Busbar dead voltage conditions of Uab,
Ubc and Uca must be satisfied meanwhile in case of 1 or 2 phase line-break of PT of
operational power supply.
Figure 3.34-3 Diagram of busbar dead voltage logic
3) "Incoming line live voltage” means someone phase voltage (or line voltage) is greater than
incoming line live voltage setting value. If there's no incoming line PT on site, incoming
line normal voltage criterion could be disabled through L1_Vol_Ena and L2_Vol_Ena
respectively.
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