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
The delay characteristics are described in the “Technical r
eference manual”. There are
some 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).
For ANSI inverse time delay characteristics all three types of reset time characteristics
are available; instantaneous (1), IEC (2 = set constant time reset) and ANSI (3 =
current dependent reset time).
For IEC inverse time delay characteristics the possible delay time settings are
instantaneous (1) and IEC (2 = set constant time reset).
For the customer tailor made inverse time delay characteristics (type 17) all three types
of reset time characteristics are available; instantaneous (1), IEC (2 = set constant time
reset) and ANSI (3 = current dependent reset time). If the current dependent type is
used then settings pr, tr and cr must be given.
Section 7 1MRK 505 370-UUS A
Current protection
190 Busbar protection REB670 2.2 ANSI
Application manual
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