IG-267-EN versión 01; 07/04/2017
28
Protection functions
General Instructions
ekor
.rpa
4.4.3. Block diagram
The thermal image unit complies with the following block
diagram :
1
Metering
2
Input signal
3
Output signal
4
Settings
Figure 4.8.
Block diagram
The thermal image unit generates the following signal:
•
Alarm
: Activated when the estimated magnitude of
thermal capacity (Th. C) exceeds the “
Alarm Threshold
”
setting, and is disabled when estimated thermal capacity
(Th. C) drops below the “
Alarm Threshold – 5%
” setting.
•
Temporize
: Activated when the estimated magnitude
of thermal capacity (Th. C) exceeds the “
Trip Threshold
”
setting, and is disabled when estimated thermal capacity
(Th. C) drops below the “
Restore Threshold
” setting.
•
Trip
: Activated when the
temporize
signal is activated,
and disabled when the estimated thermal capacity (Th.
C) drops below the “
Restore Threshold
” setting.
Moreover, the thermal image unit can be blocked by the
maximum current blocking unit detailed in the following
sections.
The thermal image unit can be blocked in three different
ways:
•
Unit Block
: Blocks the unit, preventing start-up while
this input remains active.
•
Timing Block
: Blocks the unit, allowing it to run the
alarm signal but not allowing the
temporize
or
trip
signal.
•
Trip Block
: Allows the unit to advance, and blocks it
before the trip output.
Summary of Contents for ekor.rpa Series
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