Cigré/Brasil CE B5 – Proteção e Automação Seminário Interno de Preparação para a Bienal 2006 Rio de Janeiro, 01/08/2006

Dados do Artigo Número  101 Título  IEC Impact on Substation Automation Products and Architectures Autoria  Luc Hossenlopp – AREVA  E. Guimond – SNC-Lavalin País  França/Canadá

Objetivo The aim of this paper is to analyze the example of one of the initial projects developed according to the IEC standard and have a look on what this is practically changing in term of products and architecture of the substation automation system. The example is then generalized with the observations made on other projects in order to outline some general guidelines when using this technology.

Objetivo The project in example consisted in a new 400kV GIS substation connected to a combined cycle power plant on one side and to the Algerian transmission grid on the other side (04 Geradores e 02 Saídas de Linhas). Some of the constraints and challenges included: -Use and integrate qualified protection relays. -Link with the Power Plant control system by a fully redundant IEC link. -Engineer the project within 6 months from order to Factory Acceptance Tests, this was completed in january/2005.

Objetivo Diagrama Unifilar:

Objetivo Products: The system is made of IEDs from five different suppliers with different communication capabilities. The requirement for qualified protection and metering IEDs has lead to the use of legacy communication protocols for some of the products since they were not available on IEC when the project started.

Objetivo Logical Architecture (Not Physical Architecture):

Destaque Redundancy A more delicate question concerns the management of the link redundancy. This is not defined by the standard and several solutions are currently proposed. The reconfiguration performance in case of a failure of the main link is the key issue: few solutions enable to stay compatible with the “4 ms” transfer time (traditional reference when assessing performance for substation communications) between IEDs. For instance the fast spanning tree is an algorithm defined by the IEEE 803.2w standard to reach real time performance, however its current implementation does not respect this constraint with a typical architecture made of a ring with 20 different switches.IEC

Dúvidas 1. Qual o resultado dos Testes de aceitação em fábrica e campo? 2. Foi realizado testes de avalanche e qual foi a sua performance?

Conclusões IEC is a very exciting technology possibly driving a lot of innovations. One needs to pay attention that this is still a young one (thus theory and reality might differ) and more importantly that this is only a base for the definition of a system. It will naturally reinforce the need for a robust system design (architect mission) and the use of more advanced engineering tools (configuration, simulation).

Respostas às questões do REP Perguntas: