ABB Relion 670 Series Applications Manual page 184

Section 7
Current protection
ANSI10000031 V1 EN-US
Figure 100: Relay characteristic angle given in degree
In a transmission network a normal value of RCA is about 80°.
VPolMin: Minimum polarization (reference) voltage % of VBase.
I>Dir: Operate residual current level for directional comparison scheme. The setting is given in % of
IBase. The pickup forward or pickup reverse signals can be used in a communication scheme. The
appropriate signal must be configured to the communication scheme block.
7.5 Thermal overload protection, two time constants TRPTTR
(49)
7.5.1 Identification
Function description
Thermal overload protection, two time
constants
178
Reverse
Area
AngleRCA
Iop = I2
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Forward
Area
ANSI10000031-1-en.vsd
IEC 61850 IEC 60617
identification identification
TRPTTR
SYMBOL-A V1 EN-US
1MRK 505 370-UUS Rev. K
Vpol=-V2
ANSI/IEEE C37.2
device number
49
Busbar protection REB670
Application manual
IP14513-1 v4
M14877-1 v2