Common Settings For All Steps - ABB REC670 Applications Manual

1MRK 511 401-UEN A
8.5.3.2
Bay control REC670 2.2 IEC
Application manual
For the independent time delay characteristics the possible delay time settings are
instantaneous (1) and IEC (2 = set constant time reset).
For ANSI 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).
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 pr, tr and cr must be given.
tPCrvx, tACrvx, tBCrvx, tCCrvx: Parameters for programmable inverse time
characteristic curve. The time characteristic equation is according to equation 45:
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A
ç
[ ] = +
t s
ç
p
æ ö
i
-
C
ç ÷
ç
è > ø
è
in
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.

Common settings for all steps

x means step 1, 2, 3 and 4.
AngleRCA: Relay characteristic angle given in degrees. This angle is defined as
shown in figure 78. The angle is defined positive when the residual current lags the
reference voltage (Upol = -U2)
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÷
÷
×
B k
÷
÷
ø
Section 8
Current protection
(Equation 45)
GUID-A00A942B-E760-42EE-8FEB-F723426783F3 v1
179