Technical Data; Loss Of Load Supervision Loflptuc; Identification; Function Block - ABB RELION REX640 Technical Manual

1MRS759142 C
4.1.6.10
4.1.7
4.1.7.1
4.1.7.2
4.1.7.3
4.1.7.4
REX640
Technical Manual

Technical data

Table 423: JAMPTOC Technical data
Characteristic
Operation accuracy
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode

Loss of load supervision LOFLPTUC

Identification

Function description
Loss of load supervision

Function block

GUID-5DA3933F-8908-401D-8207-1FD130E4D203 V1 EN
Figure 208: 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.

Analog channel configuration

LOFLPTUC has one analog group input which must be properly configured.
Protection functions
Value
Depending on the frequency of the measured
current: f ±2 Hz
n
±1.5% of the set value or ±0.002 × I
Typically 40 ms
Typically 0.96
<35 ms
±1.0% of the set value or ±20 ms
IEC 61850 IEC 60617
identification identification
LOFLPTUC 3I<
Section 4
n
ANSI/IEEE C37.2
device number
37
379