ABB REB650 - Thermal Overload Protection, Two Time Constants TRPTTR

AngleRCA
Forward
Area
Iop = I2
Upol=-U2
Reverse
Area
IEC10000031-1-en.vsd
IEC10000031 V1 EN-US
Figure 47: 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.
7.4 Thermal overload protection, two time constants
TRPTTR
IP14513-1 v4
1MRK 505 388-UEN B Section 7
Current protection
Busbar protection REB650 2.2 IEC 117
Application manual