ABB REB670 Series Applications Manual page 176

Section 7
Current protection
IEC10000031 V1 EN-US
Figure 98: Relay characteristic angle given in degree
In a transmission network a normal value of RCA is about 80°.
UPolMin : Minimum polarization (reference) voltage % of UBase .
I>Dir : Operate residual current level for directional comparison scheme. The setting is given in
% of IBase . The start forward or start 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
7.5.1 Identification
Function description
Thermal overload protection, two
time constants
170
Reverse
Area
AngleRCA
Iop = I2
Forward
Area
IEC 61850 IEC 60617
identification identification
TRPTTR
SYMBOL-A V1 EN-US
1MRK 505 370-UEN D
Upol=-U2
IEC10000031-1-en.vsd
ANSI/IEEE C37.2
device number
49
Busbar protection REB670
Application manual
IP14513-1 v4
M14877-1 v2