Operation Principle - ABB RELION REX640 Technical Manual

Section 4
Protection functions
4.2.1.5
404
Table 450: Analog inputs
Input
IRES
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 EFxPTOC can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
Level
Io
IRES
detector
ENA_MULT
Blocking
BLOCK
logic
GUID-616B3E0E-9E9A-409E-8486-B48C943F86F7 V1 EN
Figure 220: Functional module diagram
Level detector
The measured residual current is compared to the set Start value. If the measured value
exceeds the set Start value, the level detector sends an enable-signal to the timer
module. 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.
The start value multiplication is normally done when the inrush detection function
(INRPHAR) is connected to the ENA_MULT input.
Description
Residual current (measured or calculated)
Timer
OPERATE
t
t
START
1MRS759142 C
REX640
Technical Manual