ABB RELION REF615R, Technical Manual

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4.1.1.5 Measurement modes
The function operates on four alternative measurement modes: "RMS", "DFT", "Peak-to-
Peak" and "P-to-P + backup". The measurement mode is selected with the setting
Measurement mode .
Table 67: Measurement modes supported by 51P/50P stages
Measurement mode 51P 50P-1/2 50P-3
RMS x x
DFT x x
Peak-to-Peak x x
P-to-P + backup x
For a detailed description of the measurement modes, see the
Measurement modes section in this 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 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:
Table 68: Timer characteristics supported by different stages
Operating curve type 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
Table continues on next page
1MRS240050-IB C
Section 4
Protection functions
REF615R 117
Technical Manual