ABB REG670 Applications Manual page 335

1MRK 502 071-UEN -
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
txMin: Minimum operate time for all 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 - 60.000s in steps of 0.001s.
IxMult: Multiplier for scaling of the current setting value. If a binary input signal
ENMULTx (enableMultiplier) is activated the current operation level is increased by
this setting constant. Setting range: 1.0-10.0
Operate time
tx
txMin
IMinx
IEC10000058 V2 EN
Figure 173: Minimum operate current and operate time for inverse time
characteristics
In order to fully comply with the definition of the curve, the setting parameter txMin
shall be set to a value equal to the operating time of the selected inverse curve for
twenty times the set current pickup value. Note that the operate time is dependent on
the selected time multiplier setting kx.
ResetTypeCrvx: The reset of the delay timer can be made as shown in Table 35.
Table 35: Reset possibilities
Curve name
Instantaneous
IEC Reset (constant time)
ANSI Reset (inverse time)
The delay characteristics are described in Technical manual. There are some
restrictions regarding the choice of the reset delay.
For the definite time delay characteristics, the possible delay time setting
instantaneous (1) and IEC (2 = set constant time reset).
Current
IEC10000058
Curve index no.
1
2
3
Section 9
Current protection
329