ABB Relion 670 Series Applications Manual page 126

Section 8
Current protection
DirModeSelx : The directional mode of step x . Possible settings are Disabled / Non-directional /
Forward / Reverse .
Characteristx : Selection of time characteristic for step x . Definite time delay and different types of
inverse time characteristics are available according to Table 13.
Table 13:
Curve name
ANSI Extremely Inverse
ANSI Very Inverse
ANSI Normal Inverse
ANSI Moderately Inverse
ANSI/IEEE Definite time
ANSI Long Time Extremely Inverse
ANSI Long Time Very Inverse
ANSI Long Time Inverse
IEC Normal Inverse
IEC Very Inverse
IEC Inverse
IEC Extremely Inverse
IEC Short Time Inverse
IEC Long Time Inverse
IEC Definite Time
User Programmable
ASEA RI
RXIDG or RD (logarithmic)
The different characteristics are described in
Pickupx : Operate phase current level for step x given in % of IB .
Ix>Max and Ix>Min should only be changed if remote setting of operation current level, Ix> , is used.
The limits are used for decreasing the used range of the
Ix>Min , the closest of the limits to Ix> is used by the function. If Ix>Max is smaller than Ix>Min ,
and
the limits are swapped.
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.
TDx : Time multiplier for inverse time delay for step x .
IMinx : Minimum operate current in % of IB for all inverse time characteristics, below which no
operation takes place.
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
the ANSI reset works as if current is zero when current drops below
120
Inverse time characteristics
© Copyright 2017 Hitachi Power Grids. All rights reserved
Technical manual .
Ix> setting. If Ix> is set outside Ix>Max
IMinx is set above Pickupx for any step
IMinx .
1MRK 511 407-UUS Rev. J
Phasor measurement unit RES670
Application manual