41
Protection functions
—
Table 30. Three-phase non-directional overcurrent protection (PHxPTOC)
Characteristic Value
Operation accuracy
PHLPTOC
n
PHHPTOC
and
PHIPTOC
n
n
)
n
)
Start time
Minimum Typical Maximum
PHIPTOC:
I
Fault
I
Fault
PHHPTOC and PHLPTOC:
I
Fault
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Operate time accuracy in inverse time mode
Suppression of harmonics
RMS: No suppression
n x f
n
Peak-to-Peak: No suppression
n
, f
n
= 50 Hz, fault current in
one phase
with nominal frequency injected from random phase angle, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
3) Includes the delay of the heavy-duty output contact
1) For further reference, see the Operation characteristics table
—
Table 31. Three-phase non-directional overcurrent protection (PHxPTOC) main settings
Parameter Function Value (range) Step
Start value
PHLPTOC
n
PHHPTOC
n
PHIPTOC
n
Time multiplier PHIPTOC
Operate delay time
PHLPTOC and PHHPTOC
PHIPTOC
Operating curve type
PHLPTOC
Definite or inverse time
PHHPTOC
Definite or inverse time
PHIPTOC Definite time
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