ABB RELION 630 Series Technical Manual page 331

1MRS757256 F
PML630/Compact Load-Shedding Solution
Technical Manual
The OC_OPR output of the component is activated when the cumulative sum of the
integrator calculating the overcurrent situation exceeds the value set by the inverse-
time mode. The set value depends on the selected curve type and the setting values
used. The curve scaling is determined with the Time multiplier setting.
The Minimum operate time setting defines the minimum operate time for the IDMT
mode, that is, it is possible to limit the IDMT based operate time for not becoming too
short.
For example
GUID-1EBEDA6B-BB19-422D-8F23-5E5ECA83AF12 V1 EN
Figure 171: Operate time curves based on IDMT characteristic with the value of
the Minimum operate time setting = 0.5 second
General function block features
Section 9
325