ABB RELION REX640 Technical Manual page 774

Protection functions
4.3.6.5 Operation principle
The function can be enabled and disabled with the
corresponding parameter values are "On" and "Off".
The operation of HIxPDIF can be described with a module diagram. All the modules
in the diagram are explained in the next sections.
Figure 439: Functional module diagram
The module diagram illustrates all the phases of the function. Functionality for
phases A, B and C is identical.
774
I_A
I3P
BLOCK
I_B
I3P
BLOCK
I_C
I3P
BLOCK
All three phases have independent settings.
Operation setting. The
Timer Timer
Level
t t
detector
Blocking
logic
Timer Timer
Level
t t
detector
Blocking
logic
Timer Timer
Level
t t
detector
Blocking
logic
1MRS759142 F
START
OPERATE
START
OPERATE
START
OPERATE
REX640
Technical Manual