When the DT characteristic is selected, it is only affected by the
Operate delay time
and
Reset delay time
settings.
The protection relay 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
to this, a user programmable curve can be used if none of the standard curves are
applicable. The user can choose the DT characteristic 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 504: Timer characteristics supported by different stages
Operating curve type EFLPTOC EFHPTOC
(1) ANSI Extremely Inverse x x
(2) ANSI Very Inverse x
(3) ANSI Normal Inverse x x
(4) ANSI Moderately Inverse x
(5) ANSI Definite Time x x
(6) Long Time Extremely Inverse 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
(15) IEC Definite Time x x
(17) User programmable curve x x
(18) RI type x
(19) RD type x
EFIPTOC supports only definite time characteristics.
For a detailed description of timers, see
Chapter 11 General function
block features
in this manual.
Protection functions 1MRS759142 F
444 REX640
Technical Manual
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