ABB RELION 670 Series Applications Manual page 163

1MRK 505 337-UUS A
Curve name
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 "
Ix> : Operation phase current level for step x given in % of IBase .
tx: Definite time delay for step x. Used if definite time characteristic is chosen. Setting range:
0.000-60.000 s in step of 0.001 s. 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.
InxMult : Multiplier for scaling of the current setting value. If a binary input signal (enableMultiplier)
is activated the current operation level is increase by this setting constant. Setting range: 1.0-10.0
txMin : Minimum operation time for IEC 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: 0.000-60.000 s in step of
0.001 s.
ResetTypeCrvx : The reset of the delay timer can be made in different ways. By choosing setting
the possibilities are according to table 29.
Table 29: Reset possibilities
Curve name
Instantaneous
IEC Reset (constant time)
ANSI Reset (inverse time)
The delay characteristics are described in the "
restrictions regarding the choice of reset delay.
For the independent time delay characteristics the possible delay time settings are instantaneous
(1) and IEC (2 = set constant time reset).
Application manual
Technical reference manual ".
Curve index no.
1
2
3
Technical reference manual ". There are some
Section 7
Current protection
157