Sensitive Directional Residual Overcurrent And Power Protection Sdepsde (67N) - ABB RELION RET670 Applications Manual

1MRK 504 163-UUS A
9.6
Transformer protection RET670 2.2 ANSI
Application manual
Reverse
Area
ANSI10000031 V1 EN-US
Figure 276: 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.
Sensitive directional residual overcurrent and power
protection SDEPSDE (67N)
AngleRCA
Forward
Area
Iop = I2
Section 9
Current protection
Vpol=-V2
ANSI10000031-1-en.vsd
SEMOD171436-1 v4
555