ABB RET670 - Broken Conductor Check BRCPTOC (46)

3.7.12 Broken conductor check BRCPTOC (46)
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Broken conductor check BRCPTOC - 46
3.7.12.1 Application
Conventional protection functions can not detect the broken conductor condition.
Broken conductor check (BRCPTOC, 46) function, consisting of continuous current
unsymmetrical check on the line where the IED connected will give alarm or trip at
detecting broken conductors.
3.7.12.2 Setting guidelines
Broken conductor check BRCPTOC (46) must be set to detect open phase/s (series
faults) with different loads on the line. BRCPTOC (46) must at the same time be set to
not operate for maximum asymmetry which can exist due to, for example, not
transposed power lines.
All settings are in primary values or percentage.
Set IBase to power line rated current or CT rated current.
Set minimum operating level per phase Pickup_PH to typically 10-20% of rated current.
Set the unsymmetrical current, which is relation between the difference of the
minimum and maximum phase currents to the maximum phase current to typical
Pickup_ub = 50%.
Note that it must be set to avoid problem with asymmetry under
minimum operating conditions.
Set the time delay tOper = 5 - 60 seconds and reset time tReset = 0.010 - 60.000 seconds.
1MRK504116-UUS C Section 3
IED application
493
Application manual