ABB RELION 670 Series Applications Manual page 171

1MRK 505 337-UUS A
Trip time
tx
txMin
ANSI10000058 V1 EN-US
Figure 85: Minimum pickup current and trip time for inverse time characteristics
In order to fully comply with the curves definition, the setting parameter
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
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 39:
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t s
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EQUATION1722 V1 EN-US
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.
Application manual
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Pickup current
ANSI10000058-1-en.vsdx
kx .
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harmonic restrain function.
Section 7
Current protection
txMin shall be set to the
(Equation 39)
165