ABB RELION 670 Series Applications Manual page 200

Section 7
Current protection
S TD S
=
EQUATION1893-ANSI V1 EN-US
Where
S
S
old
S
Calculated
TD
The value of
long.
The calibration factors for current and voltage measurement errors are set % of rated current/
voltage:
IMagComp5, IMagComp30, IMagComp100
VMagComp5, VMagComp30, VMagComp100
IAngComp5, IAngComp30, IAngComp100
The angle compensation is given as difference between current and voltage angle errors.
The values are given for operating points 5, 30 and 100% of rated current/voltage. The values
should be available from instrument transformer test protocols.
7.10 Capacitor bank protection CBPGAPC
7.10.1 Identification
Capacitor bank protection
7.10.2 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
194
( )
TD S
1
⋅ + − ⋅
Old Calculated
is a new measured value to be used for the protection function
is the measured value given from the function in previous execution cycle
is the new calculated value in the present execution cycle
is settable parameter
TD = 0.92 is recommended in generator applications as the trip delay is normally quite
Function description IEC 61850 IEC 60617
identification identification
CBPGAPC -
1MRK 505 337-UUS A
(Equation 69)
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
Application manual