ABB Relion 620 Series - Page 261

4.1.2.5 Timer characteristics
PH3xPTOC 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 ABB praxis and are referred to as RI and RD. In addition, 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 following characteristics, which comply with the list in the IEC 61850-7-4
specification, indicate the characteristics supported by different stages:
Table 245: IDMT curves supported by different stages
Operating curve type Supported by
PH3LPTOC PH3HPTOC
(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
PH3IPTOC supports only definite time characteristic.
For a detailed description of timers, see Chapter 11 General function
block features in this manual.
1MRS757644 H Protection functions
620 series
Technical Manual
261