Technical brochure
TB 871 WG A3.41

Current interruption in SF6-free switchgear

The Technical Brochure of WG A3.41 deals with the technology, availability and application of SF6-free transmission and distribution switchgear. It focuses on the mainstream of upcoming SF6-free current interruption technologies, on the one hand based on interruption in natural-origin gases and their mixtures with fluoronitrile (C4-FN), fluoroketone (C5-FK), and on the other hand based on technical air-insulated vacuum circuit breakers. Despite the different physical characteristics of the SF6-free alternatives, minor modifications enable similar performance, application range and size as their SF6 equivalents, at present up to 170 kV. Products and (pilot) projects with SF6-free switchgear are reported in this Technical Brochure.

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Transmission and distribution equipment

This Technical Brochure has been created by a Working Group from the CIGRE Transmission and distribution equipment Study Committee which is one of CIGRE's 16 domains of work.
The scope of the SC A3 covers theory, principles and concepts, functionality, technological development, design, performance and application of materials, efficiency and operation for all devices for switching, interrupting and limiting currents, load switches, re-closers, ring-main units disconnecting switches, earthing switches surges arresters, capacitors, busbars, equipment insulators and instrument transformers and all other equipment within the substation not specifically covered under another equipment Study
Committee’s scopes.

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