Abstract
Between years 1997 and 2016 eleven fixed series capacitors (FSCs) have been built to enhance the interarea transmission capability of Finnish 400 kV transmission system. During these years, Fingrid (Finnish transmission system operator) has experienced various reliability issues with the existing FSCs. In early 2017 Fingrid launched a development project with target to improve the reliability and cost-effectiveness of Fingrid’s FSC fleet by developing the FSC specification, project and maintenance practices. As a part of the project, possibilities to develop FSC overvoltage protection requirements were studied for more robust, reliable and cost-effective technical solution. To compare investment costs and risks of FSC protection with and without forced triggered spark gap, an extensive EMT study was carried out. The study consisted of MOV energy and TRV-risk assessments including extensive sensitivity analysis covering 11 existing and 2 new FSC installations. Based on results of the study, new improved MOV dimensioning principles and the line circuit breakers’ TRV requirements were established to address for future FSC investments and refurbishments.
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