IG-267-EN versión 01; 07/04/2017
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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.
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