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What is a high-speed DC circuit breaker? It’s a protective device with a very
simple characteristic – it should always trip at the set maximum current (Ids)
within a specified time, typically 10 ms, irrespective of the magnitude of the
overcurrent. When testing these devices, the parameters that need to be measured
are Ids, the opening time of the breaker, and the contact resistance for the
main contacts. These breakers are clearly very different from the types found in
the power industry, so where are they used?

 

Their main application is in the transportation sector. In many countries,
national railway systems that employ electric traction are split approximately
50/50 between AC and DC traction current. Typically, long distance highspeed
links use AC, whereas local rail services, as well as trams, metros and other
light rail services use DC. And wherever DC traction is used, DC HSCBs are
needed. However, this is not their only application; around 10 % of DC HSCBs are
used in other sectors, such as marine and mining. This percentage may well
increase in the future with the growth in popularity of renewable energy
sources, many of which are DC.

 

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