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Maximum transformer rating/circuit breakers in parallel configuration - 2nd round

J

Jpascp

Electrical
Jan 15, 2025
29
For MV voltage level (36 kV) the maximum nominal current for CB are:

2500 A

3150 A (forced ventilation)

Nowadays there are still the same values or bigger values can be found? Where?
 
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40 years ago I helped install a 6000 Amp, 13kV SF6 breaker in an underground substation.
 
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Gianoli said:
This manufacturer offers power circuit breakers with 5000 Amp continuous current ratings at the 38kV level:

www.siemens.com

8DA medium-voltage, gas-insulated, arc-resistant switchgear

MV GIS is ideal for critical power applications when reliability is paramount. Ratings: up to 42 kV, 40 kA, 5,000 A main bus, and 200 kV BIL.
www.siemens.com www.siemens.com
Click to expand...
5000 A in busbars.

Feeders is 2500 A maximum.
 
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The footnotes on page 5 of the attachment indicate 3150 A is available with forced cooling for Single-busbar and double-busbar switchgear. With, as mentioned, 5000 A reserved for the main switchgear bus only.






The Siemens 3AH3 breakers are available for 4000 continuous current rating @ 36kV (page 42).

 
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Gianoli said:
The footnotes on page 5 of the attachment indicate 3150 A is available with forced cooling for Single-busbar and double-busbar switchgear. With, as mentioned, 5000 A reserved for the main switchgear bus only.






The Siemens 3AH3 breakers are available for 4000 continuous current rating @ 36kV (page 42).

Click to expand...
Vacuum CB's up to 4000A for integration into MV SWGRs for special applications (example: Simetal Sivac-X furnace switchgear) and not into conventional GIS or AIS MV
 
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