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164
Synchro-check and energising-check
(SYRW)
(QHUJL]LQJ FKHFN JHQHUDO
The energizing check is made when a disconnected line is to be connected to an en-
eraized section of a network, see figure 72. The check can also be set to allow energi-
zation of the busbar or in both directions.
U-Bus
ULHigh>30-100%U1b
UBHigh>30-100%U1b
ULow <10-100%U1b
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An energizing can occur, depending on:
•
the set direction of the energizing function
•
the set limit for energized (live - UL High) condition on line
•
the set limit for energized (live - UB High) condition on busbar
•
the set limit for non-energized (dead - Ulow) condition
The equipment is considered energized if the voltage is above the set value ULHigh and
UBHigh respectively (e.g. 80% of the base voltage), and non-energized if it is below
the set value, ULow (e.g. 30% of the base voltage). The user can set the ULHigh, UB-
High condition between 30-100% U1b and the ULow condition between 10-100% U1b.
A disconnected line can have a considerable potential due to, for instance, induction
from a line running in parallel, or by being fed via the extinguishing capacitors in the
circuit breakers. This voltage can be as high as 30% or more of the rated voltage of the
line.
The energizing operation can be set to operate in either direction over the circuit break-
er, or it can be permitted to operate in both directions. Use the AutoEnerg and ManEn-
erg HMI setting to select the energizing operation in:
U-Line
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