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Logic
The following figure shows the logic diagram of the unbalanced load protection. The protection may be blocked
via a binary input („>BLOCK I2"). Pickups and time stages are reset and the metered values in the thermal
replica are cleared. The binary input „>RM th.rep. I2" only serves to clear metered values of the thermal
characteristic.
Figure 2-24
Logic diagram of the unbalanced load protection
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
2.12 Unbalanced Load (Negative Sequence) Protection (ANSI 46)
Functions
93
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