Common Settings For All Steps - ABB Relion REC670 Applications Manual

Section 7
Current protection
For IEC inverse time delay characteristics the possible delay time settings are instantaneous
(1) and IEC (2 = set constant time reset).
For the programmable inverse time delay characteristics all three types of reset time
characteristics are available; instantaneous (1), IEC (2 = set constant time reset) and ANSI (3 =
current dependent reset time). If the current dependent type is used settings
must be given.
tPCrvx , tACrvx , tBCrvx , tCCrvx : Parameters for programmable inverse time characteristic
curve. The time characteristic equation is according to equation 45:
æ
ç
ç
[ ] =
t s
ç
ç
è
EQUATION1189 V1 EN-US
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.
7.5.3.2

Common settings for all steps

AngleRCA : Relay characteristic angle given in degrees. This angle is defined as shown in
figure 62. The angle is defined positive when the residual current lags the reference voltage
(Upol = -U2)
132
ö
÷
A
÷
+ ×
B k
÷
p
æ ö
i
-
C
ç ÷ ÷
è > ø
ø
in
x means step 1, 2, 3 and 4.
1MRK 511 358-UEN A
pr , tr and cr
(Equation 45)
GUID-A00A942B-E760-42EE-8FEB-F723426783F3 v1
Application manual