Loss Of Load Supervision 37M; Identification; Function Block; Functionality - ABB RELION 620 Series Technical Manual

1MAC504801-IB E
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620 series ANSI
Technical Manual

Loss of load supervision 37M

Identification

Function description
Loss of load supervision

Function block

GUID-9EB4ADFD-AE00-4B98-B050-DE8CED6AEEC5-ANSI V3 EN
Figure 116: Function block

Functionality

The loss of load supervision 37M is used to detect a sudden load loss which is considered
as a fault condition.
37M picks up 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 trip 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 "Enable" and "Disable".
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.
IEC 61850 IEC 60617
identification identification
LOFLPTUC 3I<
Section 4
Protection functions
ANSI/IEEE C37.2
device number
37M
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