Technical brochure
TB 931 WG A3.40

Technical requirements and field experiences with MV DC switching equipment

Today's power grids are generally powered by AC electricity. Energy flow was historically from generation in power plants, through transmission and distribution, to the consumer. Recently, this structure has begun changing through the addition of generation sites distributed throughout the transmission and distribution systems. Beyond the baseline demand for safe operation under load and fault conditions, the additional generation connections stress the physical boundaries of AC networks. These changes are influencing the capacity of the network, its short circuit level, and the level of control that is capable with the tools and technology available today.

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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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