1MAC050144-MB C
Section 4
Protection functions
615 series ANSI
113
Technical Manual
4.1.1.6
Timer characteristics
51P/50P supports both DT and IDMT characteristics. The user can select the timer
characteristics with the
Operating curve type
and
Type of reset curve
settings. When the
DT characteristic is selected, it is only affected by the
Trip 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 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 88:
Timer characteristics supported by different stages
Operating curve type
Supported by
51P
50P-1/2
(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
x
x
(18) RI type
x
(19) RD type
x
50P-3 supports only definite time characteristic.
For a detailed description of timers, see the General function block features
section in this manual.
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