Ormazabal ekor.rpa Series, General Instructions Manual, Page: 64 / 116

IG-267-EN versión 01; 07/04/2017
64
Protection, metering and control models General Instructions
ekor
.rpa
Release
I&V Sensors
1
Interconnection terminal block
1.1
Power and communications bus
1.2
Relay terminal block
1.3
Cubicle terminal block
2
ekor
.rpa-110-v or
ekor
.rpa-120-v Electronic relay
3
Voltage and current sensors
3.1
Sensors interconnection
Figure 8.5. ekor
.rpa installation
The description presented is for standard configuration.
Optionally, other alternatives can be assessed, such as
positioning the unit in a control box installed on the
cubicle.
For further information or details on configurations
(schematic, etc.), contact
Ormazabal
's technical-
commercial department for your zone.
8.2.4. Checking and maintenance
The
ekor
.rpa-110-v and
ekor
.rpa-120-v control units are
designed to carry out the operating checks necessary for
both commissioning and regular maintenance checks.
Several levels are available, depending on the possibility
of interrupting service and accessing the medium-voltage
cubicle cable compartment.
Primary check (for current circuit)
In this case the tests are performed on the system when
it is completely shut down, since it involves actuating the
circuit-breaker and earthing the outgoing cables from
the cubicle. Current is injected through the toroidal-core
current transformers, and it must be checked that the
protection opens the circuit-breaker within the selected
time. In addition, you must make sure that the tripping
indications are correct and that all the events are being
recorded in the log.
In circuit-breaker cubicles, the current transformers
are installed in the cubicle's bushing (for most types
of connectors). This means there are no problems with
connection errors in the earthing grid. Additionally, these
toroidal-core current transformers are equipped with a test
connection (test flat bar) for maintenance operations.
To perform this check, follow the steps indicated below:
1.
Follow the cubicle switching sequence for earthing, in
order to access the cable compartment.
2.
Access the cable compartment and connect the test
cable to the test connector of the toroidal-core current
transformers.
3.
Connect the test cable to the current circuit of the
tester.