ABB RELION 670 Series Applications Manual page 129

1MRK 511 364-UUS A
Table 16:
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 (TRM).
Pickupx : Operation negative sequence current level for step x given in % of IBase .
tx : Definite time delay for step x . The definite time tx is added to the inverse time when inverse
time characteristic is selected. Note that the value set is the time between activation of the start
and the trip outputs.
TDx : Time multiplier for the dependent (inverse) characteristic.
IMinx : Minimum pickup current for step x in % of IBase . Set IMinx below Pickupx for every step to
achieve ANSI reset characteristic according to standard. If
the ANSI reset works as if current is zero when current drops below
MultPUx : Multiplier for scaling of the current setting value. If a binary input signal (ENMULTx) is
activated the current operation level is multiplied by this setting constant.
txMin : Minimum operation time for 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.
Application manual
Inverse time characteristics
IMinx is set above Pickupx for any step
IMinx .
Section 8
Current protection
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