4.1.1.5
Measurement modes
The function operates on four alternative measurement modes: "RMS", "DFT", "Peak-to-
Peak" and "P-to-P + backup". Additionally, there is “Wide P-to-P” measurement mode in
some products variants. The measurement mode is selected with the setting
Measurement
mode
.
Table 207:
Measurement modes supported by 51P/50P stages
Measurement mode
51P
50P
50P-3
RMS
x
x
DFT
x
x
Peak-to-Peak
x
x
P-to-P + backup
x
Wide P-to-P
x
1)
1) Available only in REG615 standard configurations C and D
For a detailed description of the measurement modes, see the
4.1.1.6
Timer characteristics
51P, 50P, 50P-3 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 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
DT characteristics 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 timer characteristics supported by different stages comply with the list in the IEC
61850-7-4 specification, indicate the characteristics supported by different stages:
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
215
Technical Manual
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