Analog Input Configuration; Operation Principle - ABB RELION REX640 Technical Manual

Section 4
Protection functions
4.1.1.4
4.1.1.5
308
The function contains a blocking functionality. It is possible to block function outputs,
timers or the function itself.

Analog input configuration

PHxPTOC has one analog group input which must be properly configured.
Table 338: Analog inputs
Input
I3P
See the preprocessing function blocks in this document for the
possible signal sources.
Improper analog channel configuration causes a validation error if the analog
channels are not completely configured or they do not match with certain settings. For
troubleshooting, check the contents of this chapter and also the preprocessing blocks
in this document. The configuration can be written to the protection relay once the
mismatch is corrected.

Operation principle

The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of PHxPTOC can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
I_A
I_B
I3P
I_C
ENA_MULT
BLOCK
GUID-8979446A-8D3E-4AA3-AC8E-8F201A7912A6 V1 EN
Figure 175: Functional module diagram
Level detector
The measured phase currents are compared phasewise to the set Start value. If the
measured value exceeds the set Start value, the level detector reports the exceeding of
the value to the phase selection logic. If the ENA_MULT input is active, the Start value
setting is multiplied by the Start value Mult setting.
Description
Three-phase currents
Phase
Level
selection
detector
logic
Blocking
logic
1MRS759142 C
Timer
t
OPERATE
START
t
Technical Manual
REX640