4.1.8 Loss of load supervision LOFLPTUC
4.1.8.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Loss of load supervision LOFLPTUC 3I< 37
4.1.8.2 Function block
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Figure 122: Function block
4.1.8.3 Functionality
The loss of load supervision LOFLPTUC is used to detect a sudden load loss which
is considered as a fault condition.
LOFLPTUC starts when the current is less than the set limit. It operates with the
definite time (DT) characteristics, which means that the function operates after a
predefined operate time and resets when the fault current disappears.
The function contains a blocking functionality. It is possible to block function
outputs, the definite timer or the function itself, if desired.
4.1.8.4 Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of the loss of load supervision can be described using a module
diagram. All the modules in the diagram are explained in the next sections.
GUID-4A6308B8-47E8-498D-A268-1386EBBBEC8F V1 EN
Figure 123: Functional module diagram
Section 4 1YHT530004D05 D
Protection functions
244 615 series
Technical Manual
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