SIPROTEC 5 - Process bus

Process Bus: Revolutionizing Protection Device Wiring

Introduction to Process Bus Technology

• Traditional wiring of switching devices and instrument transformers directly to protection devices is being challenged by the process bus approach.

• The process bus reduces wiring effort, accelerates commissioning, and enhances safety.

Functionality of the Merging Unit

• A protective merging unit (PMU) is essential for a process bus; it is positioned near instrument transformers and switching devices.

• The PMU digitizes analog values from transformers and transmits them via fiber optic cables to one or more protection devices.

• Communication is bidirectional; the PMU can also send commands back to the switching devices.

Expanding Capabilities with Non-Conventional Transformers

• Additional merging units can be integrated into the process bus for non-conventional instrument transformers in both air-insulated and gas-insulated high voltage switchgear.

• This integration aims to enhance transmission reliability across systems.

Redundancy Concepts in Process Bus Systems

• The process bus supports various redundancy concepts, including ring configurations, ensuring robust system performance.

Future Prospects with Digitalization

• Implementing a process bus lays groundwork for fully digitalized systems, enabling advanced data links and analyses for grid optimization.