Section 4 1MAC309294-MB F
Protection functions
184 RER620
Technical Manual
4.1.8 Three-phase transformer inrush detector INR
4.1.8.1 Identification
4.1.8.2 Function block
Figure 82: Function block
4.1.8.3 Functionality
The transformer inrush detection 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.
4.1.8.4 Operation principle
The function can be enabled and disabled with the Operation setting. The corresponding
parameter values are Enable and Disable.
The operation of an inrush current detection function can be described by using a module
diagram. All the blocks in the diagram are explained in the next sections.
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase inrush detector INRPHAR 3I2f> INR
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