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This part of the IEC 61850 series introduces the modelling methods, communication principles, and information models that are used in the various parts of the IEC 61850-7-x series. The purpose of this part of the IEC 61850 series is to provide - from a conceptual point of view - assistance to understand the basic modelling concepts and description methods for: - substation-specific information models for power utility automation systems, - device functions used for power utility automation purposes, and - communication systems to provide interoperability within power utility facilities. Furthermore, this part of the IEC 61850 series provides explanations and provides detailed requirements relating to the relation between IEC 61850-7-4, IEC 61850-7-3, IEC 61850-7-2 and IEC 61850-5. This part explains how the abstract services and models of the IEC 61850-7-x series are mapped to concrete communication protocols as defined in IEC 61850-8-1. The concepts and models provided in this part of the IEC 61850 series may also be applied to describe information models and functions for: - hydroelectric power plants, - substation to substation information exchange, - information exchange for distributed automation, - substation to control centre information exchange, - information exchange for metering, - condition monitoring and diagnosis, and - information exchange with engineering systems for device configuration.