IMinx: Minimum pickup current for step x in % of IBase. Set IMinx below Pickupx for
every step to achieve ANSI reset characteristic according to standard. If IMinx is set above
Pickupx for any step the ANSI reset works as if current is zero when current drops below
IMinx.
txMin: Minimum trip 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.
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
ANSI10000058-1-en.vsdx
Trip time
Pickup current
tx
txMin
ANSI10000058 V1 EN
Figure 256: Minimum pickup current and trip 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
34.
1MRK 506 369-UUS - Section 9
Current protection
Line distance protection REL670 2.2 ANSI 497
Application manual
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