2. Design and sizing parameters
To meet the dielectric, electrical, thermal and mechanical constraints to which substation equipment is subjected in operation, SEM equipment is mainly dimensioned by :
resistance to permanent and temporary stress;
withstand continuous current and short-circuit current (short-term current);
pressure resistance.
2.1 Insulating gas withstands permanent and temporary stresses
A pressurized insulating gas is used to withstand the network's permanent and temporary voltages. Its characteristics determine the overall dimensions of the switchgear.
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Design and sizing parameters
Constraints specific to SEM devices
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