ABB RELION REX640 Technical Manual page 1157

1MRS759142 F
5 Protection related functions
5.1 Three-phase inrush detector INRPHAR (ANSI 68HB)
5.1.1 Identification
Function description
Three-phase inrush detector
5.1.2 Function block
Figure 656: Function block
5.1.3 Functionality
The three-phase inrush detector function INRPHAR is used to detect 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 Analog channel configuration
INRPHAR has one analog group input which must be properly configured.
Table 1103: Analog signals
Input
I3P
REX640
Technical Manual
IEC 61850 IEC 60617
identification identification
INRPHAR 3I2f>
Description
Three-phase currents
Protection related functions
ANSI/IEEE C37.2
device number
68HB
1157