Protection Related Functions; Three-Phase Inrush Detector Inrphar; Identification; Function Block - ABB RELION REC615 Technical Manual

Protection related functions

5 Protection related functions
5.1

Three-phase inrush detector INRPHAR

5.1.1

Identification

Function description
Three-phase inrush detector
5.1.2

Function block

Figure 233: 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
corresponding parameter values are "On" and "Off".
The operation of INRPHAR can be described using a module diagram. All the
modules in the diagram are explained in the next sections.
476
IEC 61850 IEC 60617
identification identification
INRPHAR 3I2f>
Operation setting. The
1MRS758755 C
ANSI/IEEE
C37.2 device
number
68
REC615 & RER615
Technical Manual