Table 28: Inverse time delay 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 (logarithmic)
The different characteristics are described in the “
Technical reference manual
”.
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
Curve index no.
Instantaneous 1
IEC Reset (constant time) 2
ANSI Reset (inverse time) 3
Section 7 1MRK 505 370-UEN D
Current protection
154 Busbar protection REB670
Application manual
To Next Page
Loading...
