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This paper describes the most important topics on automation modernization of electrical repowering system of oil refinery in Mexico with IEC-61850. A strategic automation approach for protection, metering, and control is presented, as well as a description on how to automate the electrical equipment in order to reach a thorough communication level according to the standard IEC-61850, including station, bay, and, process buses and their interoperability concepts. A proposal for process bus, considering several scenarios with merging units interface, is presented. On the other hand, the repowering electrical system have several energy sources, with different conditions and challenges to solve, one of them is the integration of equipment with IEC 61850 protocols, other scenario is the system synchronization. Furthermore, the benefits on improvement in power quality and a scheme to avoid the high costs of maintenance are discussed. With the upgrading of the electrical system, the electrical demand is considered cover for all refining processes, including the new production plant of ultralow sulfur clean gasoline.

Nowadays the refining sector in Mexico needs to increase the quantity and quality of produced fuels by installing new process plants for gasoline and ultra low sulphur diesel. These plants require the provision of electricity and steam, among other services to function properly, which can be supplied by the power plants currently installed in each refinery through an expansion of their generation capacity. These power plants need to increase its production of electricity and steam at levels above their installed capacity, which involves the addition of new power generating equipment (gas or steam turbo-generators) as well as the raise of the electrical loads. Currently, the Mexican Petroleum Company (PEMEX) is planning to restructure their electrical and steam systems in order to optimally supply the required services for the production of high quality fuels. In this paper the present status of the original electrical power systems of the refineries is assessed and the electrical integration of new process plants in the typical schemes is analyzed. Also this paper shows the conceptual schemes proposed to restructure the electrical power system for two refineries and the strategic planning focused on implement the modifications required for the integration of new process plants that will demand about 20 MW for each refinery by 2014. The results of the analysis allowed to identify the current conditions of the electrical power systems in the oil refining industry or National Refining Industry (NRI), and thereby to offer technical solutions that could be useful to engineers facing similar projects.

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