Siemens Process Bus Technology, which involves positioning a merging unit close to the instrument transformer, has been installed at the new high-voltage substation in Los Sauces for one of the largest Peruvian distribution network operators, Luz del Sur.
This process bus installation with Siprotec merging units and Siprotec protection devices is one of the first fully digitized energy automation system in operation. The new technology sets benchmarks with its future-proof design and will help optimize the entire operation of the power grid.
Luz del Sur is currently expanding its 220 kV network. Instead of conventional 1:1 cabling between the transducer and the protection device, a merging unit records the measured values from the transducer, converts them into digital format and sends them to the respective protection units via a fiber-optic ethernet cable.
The merging unit is a modular, interoperable and powerful solution between primary and secondary technology, which offers multifaceted process data recording, self-sustaining automation and secure communication. In total, 13 Siprotec 6MU85 merging units are used in this latest installation in Los Sauces, which is one of the first to utilize this technology on a large scale. The process bus from Siemens makes it possible to cover the digitalization along the process level using merging units to improve the reliability of the system, optimization of the installation, reduction of hard-wired components, and security of the maintenance staff.