Function Block; Functionality; Operation Principle - ABB RELION 620 Series Technical Manual

Section 4
Protection functions
4.1.10.2
4.1.10.3
4.1.10.4
252

Function block

GUID-7A8FDE81-366E-48B4-AC82-2E999D05ECF8 V2 EN
Figure 114: Function block

Functionality

The phase reversal protection 46R is used to detect the reversed connection of the phases
to a three-phase motor by monitoring the negative phase sequence current I
46R picks up and trips when I
characteristics. 46R is based on the calculated I
values during the motor startup. The excessive I
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 "Enable" and "Disable".
The operation of phase reversal protection can be described with a module diagram. All
the modules in the diagram are explained in the next sections.
Level
I
2
detector
BLOCK
GUID-F0B4B5EF-8B3C-4967-9818-24DACE686FC8-ANSI V1 EN
Figure 115: Functional module diagram
Level detector
The level detector compares the negative-sequence current to the set Pickup value. If the I
value exceeds the set Pickup value, the level detector sends an enabling signal to the timer
module.
exceeds the set limit. 46R operates on definite time (DT)
2
, and the function detects too high I
2
values are caused by incorrectly
2
Timer
PICKUP
t
TRIP
1MAC504801-IB E
of the motor.
2
2
2
620 series ANSI
Technical Manual