Settings For Each Step - Hitachi Relion 670 Series Applications Manual

Section 8
Current protection
8.3.3.1

Settings for each step

DirModeSelx: The directional mode of step x. Possible settings are off/nondirectional/forward/reverse.
Characteristx: Selection of time characteristic for step x. Definite time delay and different types of inverse
time characteristics are available.
Table 17:
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 (logarithmic)
The different characteristics are described in the Technical Reference Manual (TRM).
Pickupx: Operation negative sequence current level for step x given in % of IBase.
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 the dependent (inverse) characteristic.
128
When inverse time overcurrent characteristic is selected, the trip time of the stage will be the
sum of the inverse time delay and the set definite time delay. Thus, if only the inverse time
delay is required, it is important to set the definite time delay for that stage to zero.
x means step 1, 2, 3 and 4.
Inverse time characteristics
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Phasor measurement unit RES670
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