ABB Relion 670 Series Applications Manual page 166

Section 8
Current protection
Further description can be found in the Technical reference manual (TRM).
tPRCrvx , tTRCrvx , tCRCrvx : Parameters for customer creation of inverse reset time
characteristic curve. Further description can be found in the Technical Reference Manual.
8.5.4.2 Common settings for all steps
AngleRCA : Relay characteristic angle given in degrees. This angle is defined as shown in
figure 80. The angle is defined positive when the residual current lags the reference voltage
(Upol = -U2)
IEC10000031 V1 EN-US
Figure 80: 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
IBase . The start forward or start reverse signals can be used in a communication scheme.
% of
The appropriate signal must be configured to the communication scheme block.
160
x means step 1, 2, 3 and 4.
Reverse
Area
AngleRCA
Iop = I2
© Copyright 2017 Hitachi Power Grids. All rights reserved
Forward
Area
IEC10000031-1-en.vsd
1MRK 511 401-UEN Rev. K
GUID-A00A942B-E760-42EE-8FEB-F723426783F3 v1
Upol=-U2
Bay control REC670
Application manual