ABB Relion 670 Series Applications Manual page 146

Section 7
Current protection
tx : Definite time delay for step x . The definite time tx is added to the inverse time when inverse
time characteristic is selected. Note that the value set is the time between activation of the start
and the trip outputs.
Pickup"x" : Operate residual current level for step x given in % of IB .
INx>MaxEd2Set and INx>MinEd2Set should only be changed if remote setting of operation current
INx> , is used. The limits are used for decreasing the used range of the INx> setting. If INx> is
level,
set outside
function. If
kx : Time multiplier for the dependent (inverse) characteristic for step x .
IMinx : Minimum pickup current for step x in % of IB . Set IMinx below Pickupx for every step to
achieve ANSI reset characteristic according to standard. If
will reset at current equals to zero.
txMin : Minimum operating 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.
Trip time
tx
txMin
ANSI10000058 V1 EN-US
Figure 63: Minimum pickup current and trip time for inverse time characteristics
In order to fully comply with the curves definition, the setting parameter
value which is equal to the operate time of the selected IEC inverse curve for measured current of
twenty times the set current pickup value. Note that the operate time value is dependent on the
selected setting value for time multiplier
INxMult : Multiplier for scaling of the current setting value. If a binary input signal (MULTPUx) is
activated, the current operation level is increased by this setting constant.
ResetTypeCrvx : The reset of the delay timer can be made in different ways. The possibilities are
described in the technical reference manual.
140
INx>MaxEd2Set and INx>MinEd2Set , the closest of the limits to INx> is used by the
INx>MaxEd2Set is smaller than INx>MinEd2Set , the limits are swapped.
IMinx is set above for any step, signal
Pickup current
ANSI10000058-1-en.vsdx
kx .
1MRK 511 358-UUS A
txMin shall be set to the
Application manual