Section 5 Protection related functions
5.1 Three-phase inrush detector INR
5.1.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase inrush detector INRPHAR 3I2f> INR
5.1.2 Function block
A070377-ANSI V1 EN
Figure 384: Function block
5.1.3 Functionality
The three-phase inrush detector function INR 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 trip time characteristic for the function is of definite time (DT) type.
The function contains a blocking functionality. Blocking deactivates all outputs and resets
timers.
1MAC059074-MB A Section 5
Protection related functions
615 series ANSI 767
Technical Manual
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