ABB REG670 Applications Manual page 334

Section 9
Current protection
328
Table 34: 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
User Programmable
ASEA RI
RXIDG or RD (logarithmic)
The different characteristics are described in Technical manual.
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> setting.
If Ix> is set outside Ix>Max and Ix>Min, the closest of the limits to Ix> is used by the
function. If Ix>Max is smaller than Ix>Min, 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.
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 IMinx is set
above Ix> for any step the ANSI reset works as if current is zero when current drops
below IMinx.
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
1MRK 502 071-UEN -
Application manual