Table 86: BRCPTOC Output signals
Name Type Description
TRIP BOOLEAN Operate signal of the protection logic
START BOOLEAN Start signal of the protection logic
6.10.5 Settings
Table 87: BRCPTOC Group settings (basic)
Name Values (Range) Unit Step Default Description
Operation Off
On
- - Off Operation Off / On
Iub> 50 - 90 %IM 1 50 Unbalance current operation value in
percent of max current
IP> 5 - 100 %IB 1 20 Minimum phase current for operation of
Iub> in % of Ibase
tOper 0.000 - 60.000 s 0.001 5.000 Operate time delay
Table 88: BRCPTOC Non group settings (basic)
Name
Values (Range) Unit Step Default Description
GlobalBaseSel 1 - 6 - 1 1 Selection of one of the Global Base Value
groups
6.10.6 Monitored data
Table 89: BRCPTOC Monitored data
Name
Type Values (Range) Unit Description
IUNBAL REAL - - Measured unbalance of
phase currents
6.10.7 Operation principle
Broken conductor check (BRCPTOC) detects a broken conductor condition by
detecting the asymmetry between currents in the three phases. The current-measuring
elements continuously measure the three-phase currents.
The current asymmetry signal output START is set on if:
• The difference in currents between the phase with the lowest current and the
phase with the highest current is greater than set percentage Iub> of the highest
phase current
• The highest phase current is greater than the minimum setting value IP>.
• The lowest phase current is below 50% of the minimum setting value IP>
Section 6 1MRK 511 287-UEN A
Current protection
142
Technical manual
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