ABB Relion 670 Series Applications Manual page 140

Section 8
Current protection
Curve name
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
Ix> : 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>Max and Ix>Min , the closest of the limits to Ix> is used by the function. If Ix>Max is smaller
Ix>Min , the limits are swapped.
than
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.
kx : 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 operate current for step x in % of IBase . Set IMinx below Ix> 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 operate 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.
IxMult : Multiplier for scaling of the current setting value. If a binary input signal ENMULTx
(enableMultiplier) is activated the current operation level is increased by this setting constant.
Setting range: 1.0-10.0
134
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Technical manual .
Ix> setting. If Ix> is set outside
IMinx is set above Ix> for any step
IMinx .
1MRK 511 401-UEN Rev. K
Bay control REC670
Application manual