Technical Revision History; Loss Of Load Supervision Loflptuc; Identification; Function Block - ABB RELION 611 Series Technical Manual

1MRS757454 D
4.1.4.10
4.1.5
4.1.5.1
4.1.5.2
4.1.5.3
4.1.5.4
611 series
Technical Manual

Technical revision history

Table 133: JAMPTOC Technical revision history
Technical revision
B
C

Loss of load supervision LOFLPTUC

Identification

Function description
Loss of load supervision

Function block

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Figure 63: Function block

Functionality

The loss of load supervision function 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.

Operation principle

The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of LOFLPTUC can be described using a module diagram. All the
modules in the diagram are explained in the next sections.
Protection functions
Change
Internal improvement
Internal improvement
IEC 61850 IEC 60617
identification identification
LOFLPTUC 3I<
Section 4
ANSI/IEEE C37.2
device number
37
141