ABB REG670 Applications Manual page 360

Section 9
Current protection
354
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.
Operate time
tx
txMin
IMinx
IEC10000058 V2 EN
Figure 187: Minimum operate current and operation time for inverse time
characteristics
ResetTypeCrvx: The reset of the delay timer can be made in different ways. By
choosing setting there are the following possibilities:
Curve name
Instantaneous
IEC Reset (constant time)
ANSI Reset (inverse time)
The different reset characteristics are described in the Technical Reference Manual
(TRM). 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).
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
1MRK 502 071-UEN -
Current
IEC10000058
Application manual