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Section 5
Protection related functions
5.1
Three-phase inrush detector INRPHAR
5.1.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase inrush detector
INRPHAR
3I2f>
68
5.1.2
Function block
A070377 V1 EN
Figure 234:
Function block
5.1.3
Functionality
The three-phase inrush detector function INRPHAR is used to coordinate transformer
inrush situations in distribution networks.
Transformer inrush detection is based on the following principle: the output signal
BLK2H
is activated once the numerically derived ratio of second harmonic current
I_2H and the fundamental frequency current I_1H exceeds the set value.
The operate time characteristic for the function is of definite time (DT) type.
The function contains a blocking functionality. Blocking deactivates all outputs and
resets timers.
5.1.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The
corresponding parameter values are "On" and "Off".
1MRS758755 A
Section 5
Protection related functions
REC615 and RER615
461
Technical Manual
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