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Siemens supplies process bus technology to high-voltage substation in Peru 

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.
The process and station bus systems are physically split between two Ethernet networks. This design deliberately separates the applications, increases performances and improves cyber security. 
“Siemens is driving the digitization of the power grid on all voltage levels,” said Robert Klaffus, CEO Digital Grid at Siemens Smart Infrastructure. “The process bus technology in substations digitalizes the information at the process level and communicates via fiber optic cables to the protection and station control system. Efforts for cabling, installation and maintenance are significantly reduced and at the same time the flexibility of the overall protection system is increased. A particular advantage of the process bus is the significantly increased safety for people and the system itself. Together with our local Siemens team in Peru, we are proud that our customer Luz del Sur is planning to adopt process bus technology as the standard for the implementation of all its new high-voltage substations.”
Siemens Smart Infrastructure (SI) is shaping the market for intelligent, adaptive infrastructure for today and the future. It addresses the pressing challenges of urbanization and climate change by connecting energy systems, buildings and industries. SI provides customers with a comprehensive end-to-end portfolio from a single source – with products, systems, solutions and services from the point of power generation all the way to consumption. With an increasingly digitalized ecosystem, it helps customers thrive and communities progress while contributing toward protecting the planet. SI creates environments that care. Siemens Smart Infrastructure has its global headquarters in Zug, Switzerland, and has around 72,000 employees worldwide.
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Siemens AG (Berlin and Munich) is a global technology powerhouse that has stood for engineering excellence, innovation, quality, reliability and internationality for more than 170 years. Active around the world, the company focuses on intelligent infrastructure for buildings and distributed energy systems and on automation and digitalization in the process and manufacturing industries. Siemens brings together the digital and physical worlds to benefit customers and society. Through Mobility, a leading supplier of intelligent mobility solutions for rail and road transport, Siemens is helping to shape the world market for passenger and freight services. Via its majority stake in the publicly listed company Siemens Healthineers, Siemens is also a world-leading supplier of medical technology and digital health services. In addition, Siemens holds a minority stake in Siemens Energy, a global leader in the transmission and generation of electrical power that has been listed on the stock exchange since September 28, 2020.

In fiscal 2020, which ended on September 30, 2020, the Siemens Group generated revenue of €57.1 billion and net income of €4.2 billion. As of September 30, 2020, the company had around 293,000 employees worldwide. Further information is available on the Internet at

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Eva-Maria Baumann

Smart Infrastructure

Freyeslebenstr. 1
91058 Erlangen

+49 (9131) 17-36620