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This paper seeks to revise the concepts related to the overexcitation relaying in synchronous generators for hydro power plants and its coordination with the V/Hz limiter of the automatic voltage regulator (AVR). The methodology for the ANSI 24 protection function set up in hydro power plants is revisited. Finally, problems faced during the commissioning of a power plant in Brazil is discussed.
Concepts of power bus protection are discussed in this guide. Consideration is given to availability and location of breakers, current transformers, and disconnectors as well as bus-switching scenarios, and their impact on the selection and application of bus protection. A number of bus protection schemes are presented; their adequacy, complexity, strengths, and limitations with respect to a variety...
This paper describes a conceptual design of a distributed generator controller that is capable of undertaking digital relay tasks. This capability makes the controller compliant to IEEE 1547 Standard for Interconnecting Distributed Resources with Electric Power Systems. The paper also presents the controllerpsilas behaviors in over-/under-voltage tests to show its conformance with the IEEE 1547. The...
This paper presents a practical and effective novel approach to solve the coordination problem caused by the curve intersection of overcurrent relays in subtransmission systems. Based on the IEEE and IEC standard characteristic curve equations of digital overcurrent relays, as well as the simulation curve equation for electromagnetic overcurrent relays, lever setting adjustment equations for a selected...
Many owners of distributed resources such as synchronous industrial plant or commercial facility generators (ICG) are concerned about the requirements for protective relaying when connecting to a local utility. The connection may only be for a short transfer time of a few seconds during paralleling for periodic testing. A tendency is to look at the consequences of just their own ICG trying to serve...
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