short circuit Archives - MB Drive Services

how to calculate the short circuit current

Short circuit current contribution of a VFD

Short circuit current contribution of a VFD Electric motors and generators contribute to the total fault level at the connection point. Their short circuit current is typically in the range 4…6-times the nominal current of the machine. How is the situation with a variable frequency drive? The answer is rather Read more…

By admin, 1 yearSeptember 9, 2023 ago

Protection in drive systems

What makes protection firing so brilliant?

What makes protection firing so brilliant? Protection firing, sometimes also called “firing through”, is a VFD protectionconcept used in some medium voltage drives. The principle is well described in its name:In case of a severe fault the VFD will turn on all the active switches (such as power semiconductors in Read more…

By admin, 2 yearsSeptember 15, 2022 ago