Three-Phase Inrush Detector Inrphar - ABB REF615 Applications Manual

1MRS756378 D
Section 6
6.1
6.1.1
6.1.2
6.1.3
REF615
Application Manual
Protection related functions

Three-phase inrush detector INRPHAR

Identification
Table 74: Function identification
IEC 61850 identification:
IEC 60617 identification:
ANSI/IEEE C37.2 device number:
Functionality
The transformer inrush detection 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.
Application
Transformer protections require high stability to avoid tripping during magnetizing
inrush conditions. A typical example of an inrush detector application is doubling the
start value of an overcurrent protection during inrush detection.
The inrush detection function can be used to selectively block overcurrent and earth-
fault function stages when the ratio of second harmonic component over the
fundamental component exceeds the set value.
Other applications of this function include the detection of inrush in lines connected
to a transformer.
Protection related functions
INRPHAR
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Section 6
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