A new remarkable advancement from RHM International
 Optical/Electronic GDGL Series Current Transformers
40.5 to 252 kV
Future applications will gradually open opportunities for full digital systems. Current Transformers will gradually follow this path. Under the denomination of Optical or Electronic Current Transformers they allow a direct digitalization of the current sensing that is transmitted to the local control system.
However, the existing proposed optical CTs are based on a specific sensing configuration that diverges from traditional configurations. The sensing element needs to be installed up on the primary line and powered up to the line.
RHM solution is based on the same primary HV DryShield® winding around which a Rogowsky coil has been inserted.
This combines the same long term reliability of the electrical insulation while allowing the benefits of an electronic configuration.
We propose three different configurations to benefit from a digital operation of our CT, all based on the same HV DryShield® primary insulation and all its benefits of safety, maintenance-free and easy operation.
It generates 3 major advantages to our customers:
- No need for a reconfiguration of your substation layout: the new optical CT can be installed in the exact place where a traditional was in operation before; the same support can be used and again, the user can benefit from a “plug & play” experience.
- Upgrade from traditional to digital/optical at minimum cost and time: if the user needs to replace some CT today while knowing that eventually his system will evolve towards a digital configuration, RHM provides the options of the LRGBJ-V version equipped with the sensor that would later (when the rest of the station has been upgraded) turn the CT into an optical version. This saves time and money. Our team would come on site and insert the electronic circuit while activating the sensing coil already in place.
- Operate the two options at the same time: Furthermore, some of our customers asked for a dual CT that at the same time provides a analog and digital signal at the same time. Those Electric-magnetic & Electronic Dual Current Transformer versions just activate the classical secondaries along with the sensing coil. The electronic signal processing circuit is delivered at the same time.
This unique design allows a remarkable flexibility in introducing digitalization in current transformer operation at a minimum cost. |
