IG-267-EN versión 01; 07/04/2017
9
General Instructions
ekor.rpa
General description
1.2.2. Current sensors
The current sensors are toroidal-core current transformers
with a 300/1 A or 1000/1 A or 2500/1 ratio, depending on
the models. These transformers cover the entire operation
range of Ormazabal cubicles, from rated currents 5A up to
2500 A.
The phase toroidal transformers are factory-installed in
the cubicle bushings, which significantly simplifies on-site
assembly and connection. This way, once the medium-
voltage cables are connected to the cubicle, the installation
protection is operational. Installation errors of the sensors,
due to earth grids, polarities, etc., are removed upon
installation and checked directly at the factory.
All the current sensors have an integrated protection
against the opening of secondary circuits, which prevents
overvoltages.
1
Bushing
2
Current sensors
Figure 1.5. Location of the current sensors
1.2.3. Voltage sensors
Cubicle voltage metering is carried out using a capacitor
divider incorporated in the cubicle’s bushing, which ensures
a precision of ± 5 % in the worst case scenario.
Ormazabal ekor.evt-c capacitive sensors can be used
for greater precision. These are capacitor divider voltage
sensors for gas-insulated cubicles. They are designed to
allow assembly in both separable T-connectors and busbars.
Their operation is autonomous and passive (without
external auxiliary supply), with low-voltage analogue
output and low power applicable directly to the metering
systems without prior conditioning, for installation in
medium-voltage automation and supervision systems in
networks up to 36 kV. It can also measure partial discharges
and establish communication via PLC.
Figure 1.6. ekor.evt-c voltage sensors
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