Broken Conductor Check Brcptoc; Identification; Application; Setting Guidelines - ABB REQ650 Applications Manual

Section 6
Current protection
6.9
6.9.1
6.9.2
6.9.3
112
I>: Current level for the Stub protection, set in % of IBase. This parameter should
be set so that all faults on the stub can be detected. The setting should thus be based
on fault calculations.
t: Time delay of the operation. Normally the function shall be instantaneous.

Broken conductor check BRCPTOC

Identification

Function description
Broken conductor check

Application

Conventional protection functions can not detect the broken conductor condition.
Broken conductor check (BRCPTOC) function, consisting of continuous current
unsymmetrical check on the line where the IED connected will give alarm or trip at
detecting broken conductors.

Setting guidelines

Broken conductor check BRCPTOC must be set to detect open phase/s (series
faults) with different loads on the line. BRCPTOC 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 (given in GlobalBaseSel) to power line rated current or CT rated current.
Set minimum operating level per phase IP> 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
Iub> = 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.
IEC 61850 IEC 60617
identification identification
BRCPTOC -
Breaker protection REQ650 2.2 IEC
1MRK 505 383-UEN A
SEMOD171761-1 v3
SEMOD172362-2 v2
ANSI/IEEE C37.2
device number
46
SEMOD171858-5 v3
SEMOD171866-5 v4
Application manual