Raschke, Philipp

1. Smart & Effective Monitoring of Surge Arresters: Utility Experience & Feedback

2. Mechanical Consideration & Service Life of Non-Gapped Line Arresters

Mr. Raschke graduated with a Bachelors Degree in Electrical Engineering at the University of Cooperative Education in Gera, Germany. He began his career in 2009 as Product Developer working on overvoltage protection electronics for Gigabit Ethernet. He later received his Master’s Degree in Electrical Engineering at the University of Applied Sciences in Leipzig. Since then, he has served as Product Specialist at Tridelta Meidensha, where he is responsible for development of polymer-housed surge arresters as well as surge arrester diagnostic products.

1. NGLAs have been used for decades to increase reliability and availability of transmission lines. Nevertheless, many grid operators remain skeptical about their use based on either too little or past negative service experience. Moreover, engineers have not always been exposed to convincing arguments for investing to improve line performance. This presentation aims to strengthen confidence in NGLA technology by outlining existing difficulties and providing appropriate solutions. Specifically, construction guidance for NGLA designs, quality assessment procedures and best practices for application and installation are presented. Finally, there is discussion of results of preliminary mechanical investigations as part of standardization work underway for the upcoming line arrester standard, IEC 60099-11.

2. Monitoring leakage current has become standard practice to assess the condition of gapless metal oxide surge arresters and today’s monitoring devices are able to provide highly accurate readings. However, users often still lack specific knowledge in regard to how best to assess arrester condition based on whatever leakage current behavior is observed. This presentation explains arrester failures and related leakage current patterns. These findings are based on field experience with station and line arresters covering thousands of monitors in service for at least several years, typically under difficult ambient conditions and at different system voltages.