I would like to know, which is the minimum rated current for circuit brakers of 60kV, 220kV and 400kV. All catalogues show up to.
From a design perspective of the circuit breaker, we have a maximum rated current, not a minimum rated current. The limitation of the breaker is on its maximum rated current as a result of the temperature rise test results.
You might find that ABB documentation such as the Live Tank Circuit Breaker Application guide (pdf, 6 MByte), refer to a “Rated current range”, but these ranges are typical values on a network, depending on the configuration of the network. It is not a reflection of the individual circuit breaker design specifications.
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