Sensitive Directional Residual Overcurrent And Power Protection Sdepsde - ABB REC670 Applications Manual

Section 8
Current protection
8.6
180
Reverse
Area
IEC10000031 V1 EN-US
Figure 78: 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.
Sensitive directional residual overcurrent and power
protection SDEPSDE
AngleRCA
Forward
Area
Iop = I2
1MRK 511 401-UEN A
Upol=-U2
IEC10000031-1-en.vsd
SEMOD171436-1 v4
Bay control REC670 2.2 IEC
Application manual