ABB RELION 620 Series Technical Manual page 531

1MAC504801-IB E
Section 5
5.1
5.1.1
5.1.2
5.1.3
620 series ANSI
Technical Manual
Protection-related functions
Three-phase inrush detector INR
Identification
Function description
Three-phase inrush detector
Function block
A070377-ANSI V1 EN
Figure 249: Function block
Functionality
Three-phase inrush detector 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.
Protection-related functions
IEC 61850 IEC 60617
identification identification
INRPHAR 3I2f>
Section 5
ANSI/IEEE C37.2
device number
INR
525