ABB Relion 650 Series Applications Manual page 80

Section 7
Current protection
Table 10:
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
the ANSI reset works as if current is zero when current drops below
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 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.
74
Inverse time characteristics
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IMinn is set above Pickupx for any step
IMinn .
Busbar protection REB650
1MRK 505 287-UUS B
Application manual