GUID-DC279F84-19B8-4FCB-A79A-2461C047F1B2 V1 EN
Figure 314: CCRDIF operating characteristics
When the differential current I_DIFF is in the operating region, the FAIL output is
activated.
The function is internally blocked if any phase current is higher than the set Max
operate current. When the internal blocking activates, the FAIL output is
deactivated immediately. The internal blocking is used for avoiding false operation
during a fault situation when the current transformers are saturated due to high
fault currents.
The value of the differential current is available in the monitored data view on the
LHMI or through other communication tools. The value is calculated with the
formula:
I DIFF I A I B I C I REF_ _ _ _ _= + + −
GUID-9CC931FA-0637-4FF8-85D4-6F461BD996A9 V2 EN (Equation 78)
The Start value setting is given in units of xIn of the phase current transformer. The
possible difference in the phase and reference current transformer ratios is
internally compensated by scaling I_REF with the value derived from the Primary
current setting values. These setting parameters can be found in the Basic functions
section.
The activation of the BLOCK input deactivates the FAIL output immediately.
Section 6 1YHT530004D05 D
Supervision functions
582 615 series
Technical Manual
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