Optimized mechanical interface solution for GIS grid components applications

The need to reduce greenhouse gas emissions is rapidly driving the transition to a competitive low-carbon economy [1]. This transition, both in processes and energy distribution, represents a cornerstone enabling factor for the introduction of sustainable new technologies and solutions. In electrical applications, such as switchgears and grid components, insulation gases play a fundamental role in dielectric withstanding and breaking capability. The research and selection of safe and energy-efficient technologies to avoid fluorinated greenhouse gases (SF6), traditionally used in electrical applications, is one of the main challenges in achieving sustainability goals. The use of SF6-free gas (Natural Origin Gas) composed of a blend of nitrogen and oxygen as an insulating medium require a careful assessment to balance the potential decrease in dielectric performance, the use of higher-pressure values or larger footprint. The paper addresses the challenge of designing a circuit breaker for Gas Insulated Switchgear (GIS). The considered technical solution combines the use of vacuum to enable optimized current interruption and pressurized vessel using Natural Origin Gas (SF6-free) to ensure insulation strength. Details of the design steps and analysis of pressure effects on the kinematic components during different operation phases (opening and closing) and under various environmental conditions will be presented.