Measurement Modes - ABB RELION 620 Series Technical Manual

Section 4
Protection functions
4.1.5.6
210
RCA
Negative
operation
zone
A070443-ANSI V2 EN
Figure 94: Extended operation area in directional ground-fault protection

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 157: Measurement modes supported by 67/51N and 67/50N stages
Measurement mode 67/51N and 67/50N-1
RMS
DFT
Peak-to-Peak
For a detailed description of the measurement modes, see the
Measurement modes
Positive
operation
zone
67/50N-2
x
x
x
section in this manual.
1MAC504801-IB E
x
x
x
620 series ANSI
Technical Manual