ABB RES670 Applications Manual page 150

Section 8
Current protection
144
Curve name
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 (logarithmic)
The different characteristics are described in the Technical Reference Manual
(TRM).
Ix>: Operation negative sequence 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. Note that the value set is the time
between activation of the start and the trip outputs.
kx: Time multiplier for the dependent (inverse) characteristic.
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.
IxMult: Multiplier for scaling of the current setting value. If a binary input signal
(ENMULTx) is activated the current operation level is multiplied by this setting
constant.
txMin: Minimum operation time for 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.
1MRK 511 407-UEN C
Phasor measurement unit RES670 2.2 IEC
Application manual