ABB RELION 670 SERIES Applications Manual page 522

Section 9
Current protection
516
Trip time
tx
txMin
ANSI10000058 V1 EN
Figure 265: Minimum pickup current and trip time for inverse time characteristics
In order to fully comply with the 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.
INxMult: Multiplier for scaling of the current setting value. If a binary input signal
(MULTPUx) is activated, the current operation level is increased by this setting constant.
ResetTypeCrvx: The reset of the delay timer can be made in different ways. The
possibilities are described in the technical reference manual.
tResetx: Constant reset time delay in s for step x.
HarmBlockx: This is used to enable block of step x from 2
tPCrvx, tACrvx, tBCrvx, tCCrvx: Parameters for user programmable of inverse time
characteristic curve. The time characteristic equation is according to equation 460:
æ
ç
A
ç
[ ]
=
t s
ç
p
æ ö
i
ç
-
C
ç ÷
è è ipickup ø
EQUATION1722 V1 EN
ö
÷
÷
+ ×
B TD
÷
÷
ø
1MRK 506 369-UUS -
Pickup current
ANSI10000058-1-en.vsdx
nd
harmonic restrain function.
(Equation 460)
Line distance protection REL670 2.2 ANSI
Application manual