ABB REB670 Applications Manual page 183

1MRK 505 337-UUS -
Application manual
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 "Technical reference 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.
HarmRestrainx: Enable block of step x from the harmonic restrain function (2nd
harmonic). This function should be used when there is a risk if power transformer inrush
currents might cause unwanted trip. Can be set Off/On.
tPCrvx, tACrvx, tBCrvx, tCCrvx: Parameters for customer creation of inverse time
characteristic curve (Curve type = 17). See equation
equation.
Curve index no.
1
2
3
33 for the time characteristic
Section 7
Current protection
177