ABB Relion 670 Series Applications Manual page 166

Section 7
Current protection
Table 28:
Curve name
ANSI Extremely Inverse
ANSI Very Inverse
ANSI Normal Inverse
ANSI Moderately Inverse
ANSI/IEEE Definite time
ANSI Long Time Extremely Inverse
ANSI Long Time Very Inverse
ANSI Long Time Inverse
IEC Normal Inverse
IEC Very Inverse
IEC Inverse
IEC Extremely Inverse
IEC Short Time Inverse
IEC Long Time Inverse
IEC Definite Time
User Programmable
ASEA RI
RXIDG (logarithmic)
The different characteristics are described in the "Technical reference manual".
Ix>: Operation phase current level for step x given in % of IBase.
tx: Definite time delay for step x. Used if definite time characteristic is chosen. Setting range:
0.000-60.000 s in step of 0.001 s. Note that the value set is the time between activation of the start and
the trip outputs.
kx: Time multiplier for the dependent (inverse) characteristic.
InxMult: Multiplier for scaling of the current setting value. If a binary input signal (enableMultiplier) is
activated the current operation level is increase by this setting constant. Setting range: 1.0-10.0
txMin: Minimum operation time for IEC inverse time characteristics. At high currents the inverse time
characteristic might give a very short operation time. By setting this parameter the operation time of the
step can never be shorter than the setting. Setting range: 0.000-60.000 s in step of 0.001 s.
ResetTypeCrvx: The reset of the delay timer can be made in different ways. By choosing setting the
possibilities are according to table 29.
160
Inverse time delay characteristics
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1MRK 505 370-UUS Rev. K
Busbar protection REB670
Application manual