3. Constraints specific to SEM devices
Compared with air-insulated equipment, SEM switchgear warrants special precautions in terms of design, installation and operation. These particularities mainly concern grounding circuits, the location of internal fuses, the operation of disconnectors, dielectric strength tests after on-site assembly and the use of SF 6 .
3.1 Grounding and loopback circuits
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The importance of grounding enclosures covers both functional and personal safety aspects. There are two possible grounding methods:
single-point earthing of an enclosure section, which must be isolated from adjacent sections;
multi-point...
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Constraints specific to SEM devices
Personal safety
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