Setting Guidelines; Capacitor Bank Protection Cbpgapc; Identification; Application - ABB Relion 670 Series Applications Manual

Section 7
Current protection
7.15.3

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 (given in GlobalBaseSel ) to power line rated current or CT rated current.
Set minimum operating level per phase
Set the unsymmetrical current, which is relation between the difference of the minimum and
maximum phase currents to the maximum phase current to typical
Set the time delay
7.16

Capacitor bank protection CBPGAPC

7.16.1

Identification

Capacitor bank protection
7.16.2

Application

Shunt capacitor banks (SCBs) are somewhat specific and different from other power system
elements. These specific features of SCB are briefly summarized in this section.
A capacitor unit is the building block used for SCB construction. The capacitor unit is made up of
individual capacitor elements, arranged in parallel or series connections. Capacitor elements
normally consist of aluminum foil, paper, or film-insulated cells immersed in a biodegradable
insulating fluid and are sealed in a metallic container. The internal discharge resistor is also
integrated within the capacitor unit in order to reduce trapped residual voltage after
disconnection of the SCB from the power system. Units are available in a variety of voltage ratings
(240V to 25kV) and sizes (2.5kVAr to about 1000kVAr). Capacitor unit can be designed with one or
two bushings.
The high-voltage SCB is normally constructed using individual capacitor units connected in series
and/or parallel to obtain the required voltage and MVAr rating. Typically the neighboring capacitor
units are mounted in racks. Each rack must be insulated from the other by insulators because the
can casing within each rack are at a certain potential. Refer figure
190
Note that it must be set to avoid problem with asymmetry under minimum
operating conditions.
tOper = 5 - 60 seconds and reset time tReset = 0.010 - 60.000 seconds.
Function description
Pickup_PH to typically 10-20% of rated current.
IEC 61850 IEC 60617
identification identification
CBPGAPC -
1MRK 511 358-UUS A
Pickup_ub = 50% .
GUID-41731DCF-840C-4717-9F51-899FC648F881 v2
GUID-67FC8DBF-4391-4562-A630-3F244CBB4A33 v2
ANSI/IEEE C37.2
device number
-
GUID-5EC8BAEC-9118-49EC-970C-43D6C416640A v1
GUID-BACAE67B-E64B-4963-B323-ECB0B69031B9 v2
89 for an example:
Application manual
SEMOD171866-5 v4