Measurement Modes; Timer Characteristics - ABB RELION REX640 Technical Manual

Section 4
Protection functions
4.2.1.6
4.2.1.7
406
by a binary input, a horizontal communication input or an internal signal of the
protection relay's program. The influence of the BLOCK signal activation is
preselected with the global setting Blocking mode.
The Blocking mode setting has three blocking methods. In the "Freeze timers" mode,
the operation timer is frozen to the prevailing value, but the OPERATE output is not
deactivated when blocking is activated. In the "Block all" mode, the whole function is
blocked and the timers are reset. In the "Block OPERATE output" mode, the function
operates normally but the OPERATE output is not activated.

Measurement modes

The function operates on three alternative measurement modes: "RMS", "DFT" and
"Peak-to-Peak". The measurement mode is selected with the Measurement mode
setting.
Table 451: Measurement modes supported by EFxPTOC stages
Measurement mode EFLPTOC
RMS
DFT
Peak-to-Peak
For a detailed description of the measurement modes, see the
Measurement modes

Timer characteristics

EFxPTOC 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 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.
EFHPTOC
x x
x x
x x
section in this manual.
1MRS759142 C
EFIPTOC
x
REX640
Technical Manual