Current
Operate
time
IMinx
txMin
IEC10000058-1-en.vsd
IEC10000058 V1 EN
Figure 191: Minimum operate current and operate time for inverse time
characteristics
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
350:
[ ]
p
A
t s B TD
i
C
ipickup
= + ×
-
æ ö
ç ÷
ç ÷
ç ÷
æ ö
ç ÷
ç ÷
è ø
è ø
EQUATION1722 V1 EN (Equation 350)
Section 3 1MRK504116-UUS C
IED application
426
Application manual
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