The electric utilities industry is going through significant changes related to the reduced tolerance of major customers to deviations from the nominal parameters of electric power. This has resulted in different levels of implementation of power quality monitoring in substations. At the same time microprocessor based multifunctional Intelligent Electronic Devices (IED) are becoming the standard protection, control, monitoring and recording equipment in new or existing substations. They provide increased capabilities to measure and monitor different power quality related electrical quantities. IEDs are being integrated in Substation Automation Systems (SAS) that typically require the use of a standard protocol that meets the requirements of different functions in the substation. The paper describes the challenges in the modeling of advanced power quality monitoring devices and presents some examples based on the object models defined by UCA 2.0 and IEC 61850. The appropriate modeling of power quality monitoring functions requires good understanding of the definitions of power quality, the monitored parameters and the characteristic of power quality events. At the same time it has to comply with the data models defined by UCA in the Generic Object Models for Substation and Feeder Equipment (GOMSFE). The use of standardized object models allows interoperability between IEDs from different manufacturers, reduces the engineering time for the configuration of substation automation systems and simplifies the development of applications to meet the requirements for engineering tools. The object models of different measurements and the use of GOOSE or GSSE messages for triggering of simultaneous recording by multiple IEDs in the Substation Automation System are based on UCA 2.0 or IEC 61850 documents.
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