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

[Jpascp]

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?

 

[Gianoli]

This manufacturer offers power circuit breakers with 5000 Amp continuous current ratings at the 38kV level:

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

 

[waross]

40 years ago I helped install a 6000 Amp, 13kV SF⁶ breaker in an underground substation.

 

[Jpascp]

This manufacturer offers power circuit breakers with 5000 Amp continuous current ratings at the 38kV level:

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

5000 A in busbars.

Feeders is 2500 A maximum.

 

[Jpascp]

40 years ago I helped install a 6000 Amp, 13kV SF⁶ breaker in an underground substation.

Could be. We have mentioned 36 kV.

 

[crshears]

And, just me being picky, it's SF₆, not SF⁶.

 

[Gianoli]

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.

https://assets.new.siemens.com/siemens/assets/api/uuid:45730114-5c11-4750-9df0-165f9072a93a/ANSI-MV-GIS-8DADB-Catalog-EN.pdf

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

https://assets.new.siemens.com/siemens/assets/api/uuid:2fdd0fd8-ad26-4e2e-8998-856cf2c7fbbc/HG-11-03-3AH3-EN-2018-web-201809200826054430.pdf

 

[Jpascp]

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.

https://assets.new.siemens.com/siemens/assets/api/uuid:45730114-5c11-4750-9df0-165f9072a93a/ANSI-MV-GIS-8DADB-Catalog-EN.pdf

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

https://assets.new.siemens.com/siemens/assets/api/uuid:2fdd0fd8-ad26-4e2e-8998-856cf2c7fbbc/HG-11-03-3AH3-EN-2018-web-201809200826054430.pdf

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