ABB Relion 670 Series Applications Manual page 143

1MRK 511 401-UUS F
Table 19:
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 or RD (logarithmic)
The different characteristics are described in
Pickupx : Operate phase current level for step x given in % of IB .
Ix>Max and Ix>Min should only be changed if remote setting of operation current level, Ix> , is used.
The limits are used for decreasing the used range of the
Ix>Min , the closest of the limits to Ix> is used by the function. If Ix>Max is smaller than Ix>Min ,
and
the limits are swapped.
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 inverse time delay for step x .
IMinx : Minimum operate current in % of IB for all inverse time characteristics, below which no
operation takes place.
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
txMin : Minimum trip time for all 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 - 60.000s in steps of
0.001s.
Bay control REC670
Application manual
Inverse time characteristics
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Technical manual .
Ix> setting. If Ix> is set outside Ix>Max
IMinx is set above Pickupx for any step
IMinx .
Section 8
Current protection
137