IG-267-EN versión 01; 07/04/2017
33
General Instructions
ekor.rpa
Protection functions
The four conditions which make the broken conductor unit
start up are:
Figure 4.12. Conditions A, B, C and D
The broken conductor unit generates the following signal:
• Pick up: Activated when the four conditions come
about at the same time, and disabled when any of the 4
conditions are no longer met.
• Temporize: Activated when the Pick up signal remains
active for the time set, and disabled when any of the
4 conditions are no longer met..
• Trip: Activated when the Temporize signal is activated, and
disabled when any of the 4 conditions are no longer met.
Moreover, the broken conductor unit can be blocked by the
maximum current blocking unit detailed in the following
sections.
The broken conductor unit can be blocked in three
different ways:
• Unit Block: Blocks the unit, preventing start-up while
this input remains active.
• Timing Block: Freezes the time counter value while this
input is active.
• Trip Block: Allows the unit to advance, and blocks it
before the trip output.
4.6. Voltage units
The ekor.rpa-100 model 120 systems are fitted with the
following voltage protection units:
Phases:
1. Three phase overvoltage timed units (3 x 59_TEMP)
2. Three phase overvoltage instantaneous units
(3 x 59_INST)
3. Three phase undervoltage timed units
(3 x 27_TEMP)
4. Three phase undervoltage instantaneous units
(3 x 27_INST)
Neutral (calculated):
1. A neutral overvoltage timed unit (1 x 59N_TEMP)
2. A neutral overvoltage instantaneous unit
(1 x 59N_INST)
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