9. Comparison and development of different techniques
9.1 Fields of application
Today, in the LV field, airborne magnetic cut-off is, except in a few rare cases, the only one used.
In HV and EHV, the SF 6 cut-off technique is practically the only one used.
For MT, where all techniques can be used, those of cutting in SF
6
and in vacuum have replaced those in air, for reasons of cost and size (figure
30
), and those in oil, for reasons of reliability, safety and reduced maintenance (table
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Comparison and development of different techniques
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