IG-267-EN versión 01; 07/04/2017
14
Applications
General Instructions
ekor
.rpa
In addition, the
ekor
.rpa-100 equipment,
ekor
.rpa-120
model, also have the following functions:
•
67/67N and 67NS
≡
Directional overcurrent relay,
directional earth fault relay and directional sensitive
earth fault relay.
Phase, neutral and sensitive neutral
directional functions which are associated to their
corresponding overcurrent units, together allowing
directional overcurrent units.
•
49
≡
Machine or transformer thermal relay.
Protects
against thermal overloads in lines which cannot be
detected by the overcurrent units.
•
46BC
≡
Broken conductor detection.
Detects open
lines, which are generally quite difficult to detect using
overcurrent units.
•
59/59N
≡
Overvoltage and residual overvoltage
relay.
Protects against phase and neutral overvoltages
in the lines with 2 units for each phase and neutral, one
timed and the other instantaneous.
•
27
≡
Undervoltage relay.
Protects against phase
undervoltages in the lines with 2 units for each phase,
one timed and the other instantaneous.
The units which provide the aforementioned functions are:
Unit
Type of cubicle
ekor
.rpa-100
type =
v
Circuit-breaker
Table 2.3.
ekor
.rpa-100-v
2.4. Transformer protection
The distribution transformers require various protection
functions. Their selection depends primarily on the power
and level of responsibility they have in the installation.
Figure 2.4.
Transformer protection functions in
ekor
.rpa-100
relays
Summary of Contents for ekor.rpa Series
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