... switching systems that get damned close to true sine waves....
We have found components that are fed off TAC lines on RER stock work fine when line volts drop, but on our train when the TAC drops guess what? They don't work. It is a symptom of what you describe. We have a workaround though...
Anyways in terms of traction power, now we are on high speed line the whole time, line volts issues are much rarer than they used to be.
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