ABB REC650 Applications Manual page 101

1MRK 511 286-UUS A
Application manual
Characteristn: Selection of time characteristic for step n. Definite time delay and different
types of inverse time characteristics are available according to table 8. Step 2 and 3 are
always definite time delayed.
Table 8: Inverse time characteristics
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
ASEA RI
RXIDG (logarithmic)
The different characteristics are described in Technical manual.
Pickupx: Operate phase 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.
TDn: Time multiplier for inverse time delay for step n.
IMinn: Minimum operate current for step n in % of IBase. Set IMinn below Pickupx for
every step to achieve ANSI reset characteristic according to standard. If IMinn is set above
Pickupx for any step the ANSI reset works as if current is zero when current drops below
IMinn.
tnMin: Minimum operate time for all inverse time characteristics. At high currents the
inverse time characteristic might give a very short operation time. By setting this
Section 6
Current protection
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