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groups or the
RCA_CTL
input. Alternatively, the operating sector of the directional
earth-fault protection function can be extended to cover the operating sectors of
both neutral earthing principles. Such characteristic is valid for both unearthed and
compensated network and does not require any modification in case the neutral
earthing changes temporarily from the unearthed to compensated network or vice
versa.
The extended phase angle characteristic is created by entering a value of over 90
degrees for the
Min forward angle setting; a typical value is 170 degrees ( Min
reverse angle in case Directional mode is set to "Reverse"). The Max forward angle
setting should be set to cover the possible measurement inaccuracies of current
and voltage transformers; a typical value is 80 degrees (
Max reverse angle in case
Directional mode is set to "Reverse").
Figure 147: Extended operation area in directional earth-fault protection
4.2.2.6
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 341: Measurement modes supported by (F)DEFxPDEF stages
Measurement mode
(F)DEFLPDEF
DEFHPDEF
RMS
x
x
DFT
x
x
Peak-to-Peak
x
x
1MRS758755 C
Protection functions
REC615 & RER615
Technical Manual
305
Содержание Relion REC615
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