ABB RELION 620 Series Technical Manual page 619

1MRS757644 F
4.4.2.10
4.4.3
4.4.3.1
4.4.3.2
4.4.3.3
4.4.3.4
620 series
Technical Manual
Technical revision history
Table 555: PDNSPTOC Technical revision history
Technical revision
B
C
D
Phase reversal protection PREVPTOC
Identification
Function description
Phase reversal protection
Function block
GUID-AA794558-EF3A-4E9A-AA39-BCE9FB7253FD V1 EN
Figure 315: Function block
Functionality
The phase reversal protection function PREVPTOC is used to detect the reversed
connection of the phases to a three-phase motor by monitoring the negative phase
sequence current I of the motor.
2
PREVPTOC starts and operates when I
on definite time (DT) characteristics. PREVPTOC is based on the calculated I
the function detects too high I
values are caused by incorrectly connected phases, which in turn makes the motor
rotate in the opposite direction.
The function contains a blocking functionality. It is possible to block function outputs,
timer or the function itself, if desired.
Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
Change
Internal improvement
Internal improvement
Internal improvement
IEC 61850 IEC 60617
identification identification
PREVPTOC I2>>
exceeds the set limit. PREVPTOC operates
2
values during the motor start-up. The excessive I
2
Section 4
Protection functions
ANSI/IEEE C37.2
device number
46R
, and
2
2
613