IG-267-EN versión 01; 07/04/2017
66
Protection, metering and control models General Instructions
ekor.rpa
8.3. “p” type ekor.rpa-110-p and ekor.rpa-120-p units
8.3.1. Functional description
The ekor.rpa-110-p and ekor.rpa-120-p protection,
metering and control units are focused on protection
for distribution transformers. They are installed in fuse-
combination switch cubicles so the electronic system
performs all the protection functions, except high polyphase
short-circuit values, which are cleared by the fuses.
When an overcurrent that is within the values in which the
load break switch can open is detected, the relay acts on
a low-power bistable release that opens the switch. If the
fault current is greater than the breaking capacity of the
load break switch, the switch trip is blocked so that the
fuses will blow to protect the cubicle. On the other hand,
the equipment is disconnected and the fuses do not remain
energised.
1
Terminal block
2
ekor.rpa-110-p or ekor.rpa-120-p electronic relay
3
Voltage and current sensors
Figure 8.6. ekor.rpa-100-p
Figure 8.7. Transformer protection
Figure 8.8. General protection (customer supply in MV)
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