ABB Relion 670 Series Applications Manual page 134

Section 7
Current protection
MultPUx : 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
Trip time
tx
txMin
ANSI10000058 V1 EN-US
Figure 56: Minimum pickup current and trip time for inverse time characteristics
In order to fully comply with the definition of the curve, the setting parameter
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
ResetTypeCrvx : The reset of the delay timer can be made as shown in Table 15.
Table 15:
Curve name
Instantaneous
IEC Reset (constant time)
ANSI Reset (inverse time)
The delay characteristics are described in
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).
For ANSI inverse time 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 characteristics, the possible delay time settings are instantaneous (1) and IEC
(2 = set constant time reset).
128
Reset possibilities
Curve index no.
1
2
3
Pickup current
ANSI10000058-1-en.vsdx
Technical manual . There are some restrictions regarding
1MRK 511 358-UUS A
txMin shall be set to
kx .
Application manual