ABB Relion 620 Series - Page 306

output" mode, the function operates normally but the OPERATE, OPR_A, OPR_B and
OPR_C outputs are not activated.
4.1.4.5 Timer characteristics
DPH3xPDOC supports both DT and IDMT characteristics. The timer characteristics
can be selected with the
Operating curve type and Type of reset curve settings.
When the DT characteristic is selected, it is only affected by the Operate delay time
and Reset delay time settings.
The IED provides 16 IDMT characteristics curves, of which seven comply with the
IEEE C37.112 and six with the IEC 60255-3 standard. Two curves follow the special
characteristics of the ABB praxis and are referred to as RI and RD. In addition
to this, a programmable curve can be used if none of the standard curves are
applicable. The DT characteristic can be chosen by selecting the
Operating curve
type values "ANSI Def. Time" or "IEC Def. Time". The functionality is identical in both
cases.
The list of characteristics, which matches the list in the IEC 61850-7-4 specification,
indicates the characteristics supported by different stages.
Table 294: IDMT curves supported by different stages
Operating curve type Supported by
DPH3LPDOC DPH3HPDOC
(1) ANSI Extremely Inverse x x
(2) ANSI Very Inverse x
(3) ANSI Normal Inverse x x
(4) ANSI Moderately Inverse x
(6) Long Time Extremely In-
verse
x
(7) Long Time Very Inverse x
(8) Long Time Inverse x
(9) IEC Normal Inverse x x
(10) IEC Very Inverse x x
(11) IEC Inverse x
(12) IEC Extremely Inverse x x
(13) IEC Short Time Inverse x
(14) IEC Long Time Inverse x
(17) Programmable x x
For a detailed description of the timers, see Chapter 11 General function
block features in this manual.
Protection functions 1MRS757644 H
306 620 series
Technical Manual