ANSI10000058-1-en.vsdx
Trip time
Pickup current
tx
txMin
ANSI10000058 V1 EN-US
Figure 69: 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
nd
harmonic restrain
function.
tPCrvx, tACrvx, tBCrvx, tCCrvx: Parameters for user programmable of inverse time
characteristic curve. The time characteristic equation is according to equation
38:
1MRK 511 401-UUS A Section 8
Current protection
Bay control REC670 2.2 ANSI 177
Application manual
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