ABB REG670 Applications Manual page 352

Section 9
Current protection
346
Operate time
tx
txMin
IMinx
IEC10000058 V2 EN
Figure 182: Minimum operate current and operate 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
(ENMULTx) 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
function.
tPCrvx, tACrvx, tBCrvx, tCCrvx: Parameters for user programmable of inverse time
characteristic curve. The time characteristic equation is according to equation 192:
æ
ç
A
ç
[ ] = +
t s
ç
p
æ ö
i
-
ç ÷ C
ç
è > ø
è
in
EQUATION1189 V1 EN
Further description can be found in the technical reference manual.
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
ö
÷
÷
×
B k
÷
÷
ø
1MRK 502 071-UEN -
Current
IEC10000058
nd
harmonic restrain
(Equation 192)
Application manual