Common Settings For All Steps - ABB REB670 Applications Manual

Section 7
Current protection
7.3.2.2
186
In order to fully comply with curves definition the setting parameter txMin shall be set to
the value which is equal to the operate time of the selected IEC inverse curve for measured
current of twenty times the set current pickup value. Note that the operate time value is
dependent on the selected setting value for time multiplier kx.
ResetTypeCrvx: The reset of the delay timer can be made in different ways. The
possibilities are described in the technical reference manual.
tPCrvx, tACrvx, tBCrvx, tCCrvx: Parameters for user programmable of inverse time
characteristic curve. The time characteristic equation is according to equation 39:
æ
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A
ç
[ ]
=
t s
ç
p
æ ö
i
ç
-
C
ç ÷
è ø
è ipickup
EQUATION1722 V1 EN
Further description can be found in the technical reference manual.
tPRCrvx, tTRCrvx, tCRCrvx: Parameters for user programmable of inverse reset time
characteristic curve. Further description can be found in the technical reference manual.

Common settings for all steps

AngleRCA: Relay characteristic angle given in degree. This angle is defined as shown in
figure 86. The angle is defined positive when the residual current lags the reference
voltage (Vpol = 3V or V
0
ö
÷
÷
+ ×
B TD
÷
÷
ø
)
2
1MRK 505 337-UUS -
(Equation 39)
Application manual