ABB RELION REX640, Техническое руководство, Страница: 327 / 1960

The function contains a blocking functionality. It is possible to block function
outputs, timers or the function itself.
4.1.1.4 Analog input configuration
PHxPTOC has one analog group input which must be properly configured.
Table 362: Analog inputs
Input Description
I3P Three-phase currents
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.
4.1.1.5 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.
OPERATE
Level
detector
Phase
selection
logic
BLOCK
START
ENA_MULT
t
Timer
t
I3P
I_A
I_B
I_C
Blocking
logic
Figure 198: 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.
The protection relay does not accept the
Start value or Start value Mult
setting if the product of these settings exceeds the
Start value setting
range.
1MRS759142 F Protection functions
REX640
Technical Manual
327