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Basically, yes. For both closing and opening operations, there are specified speeds for the main contacts inside the breakers. Large springs, used to supply the mechanical energy required to open and close the contacts, are charged either by a small motor inside the CB or by the energy released...

As I said, my best guess, based on what you've told me, is that the CB will likely perform properly as far as interruption is concerned. Beyond that, there are other components within a CB (solenoids, charging motors, etc.) that could be adversely affected by the change in frequency. I...

My comments are based on my past experience in vacuum interrupter (VI) design and application. I feel fairly confident that they will apply equally to SF6 CBs. Both technologies are robust and well suited for the kind of application you seem to be targeting. The issue of going from an ANSI to...

What are the short-circuit requirements for the proposed double breakers? How are these breakers actually configured: two poles per phase with a total of 6 poles operated by a single mechanism, or two 3-pole CBs operated "simultaneously"? What is the interruption medium (vacuum, SF6...)?

The "contactors" on the 4160V side - are they indeed contactors or are they circuit breakers used for switching the heavy inductive loads? The reason for asking is that the materials used for the contacts inside the vacuum interrupters are different for (motor) contactor and general circuit...

The overvoltage could be TRV. Overvoltages can also occur during capacitor switching and other duties, and can reach values of 2.5 pu in normal conditions. Depending on the type of breaker you're using (I'm assuming it's an SF6 CB though vacuum CBs have been produced for 145kV application)...

As far as your original question, the ratings you quoted for short-circuit breaking, capacitor switching, cable charging, etc. represent the levels to which the CB was tested and "certified" in an independent high-power test facility, in accordance with IEC/ANSI/IEEE procedures. As bacon4life...