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The profitability pressure on utilities as a consequence of market liberalization and other influences is leading to the reconsideration of the entire secondary technology inside the substation. Possible synergies between protection, control and monitoring have to be considered. At the same time, assets have to be used in a more efficient and profitable way and an increased security of energy delivery...
The standard IEC 61850 "communication networks and systems in substations" defines a communication system for substation automation that provides interoperability between equipment from different manufacturers. The standard introduces several new features that will have an impact on the design of a protection system. One example is the introduction of communication services for the exchange...
The paper discusses the requirements of the protection grading and testing process from the point of view of exchange of data between different tools used to achieve these tasks. The IEC 61850 substation configuration language and the different types of files are analysed. The CIM and IEC 61850 models are described and requirements for harmonization are presented.
The replacement of a Substation Control System at National Grid's Axminster 400 kV substation due to the existing substation control and protection devices reaching the end of their asset design life, presented the opportunity to develop a new solution with technology based on the suite of IEC 61850 standards. These standards define the substation Ethernet LAN, plant and equipment models and supporting...
Eskom is in the process of strengthening the transmission corridor between the North and South of South Africa by constructing a new 765 kV backbone to meet the challenge of increased electricity demand. Eskom's existing substation layouts are based on double busbar arrangements. The approved new extra high voltage (EHV) substations (765 kV and 400 kV) will be based on a breaker-and-a-half substation...
The opportunity to develop a real life IEC 61850 [1] GOOSE [2] application arose during the initial stages of substation refurbishment projects. Existing software based interlocking systems were identified as having to be replaced. This paper details the development of the solution and replacement strategy. It is not the intention to describe interlocking rules.
A new protection stabilisation system against transformer inrush currents is proposed in the paper. The system makes use of two criteria: correlation coefficients from current waveshape analysis and equivalent instantaneous inductance estimate, combined in a reliable unit by means of fuzzy logic. The scheme performance is verified with the signals obtained from EMTP-ATP simulation.
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