How to choose a medium voltage VFD:Protection concept A variable speed drive system with gaps in protection philosophy is a ticking bomb. It might have a huge impact on plant availability and potentially also on personal safety. Therefore, no compromises Read more…
How to choose a medium voltage VFD:Design robustness Every end user probably wishes that his VFD has a robust design and works as intended during the entire lifetime of at least 20 years. Unplanned shutdowns and outages are unwanted. But Read more…
How to choose a medium voltage VFD:Motor compatibility VFD – motor compatibility is an essential precondition for successful operation of power drive system. There is a large amount of publications underlying this topic. This article aims to explain the matter Read more…
How to choose a medium voltage VFD:Line side connection and power quality Nowadays modern VFDs offer large variety of line side configurations. Which one to select? That is the topic of today. There are two basic groups of VFDs based Read more…
How to choose a medium voltage VFD: Cooling type This post looks into drive classification according to cooling. Same as for instance electric motors also VFDs can be divided in two main groups with regards to VFD cooling type: Air Read more…
How to choose a medium voltage VFD: Application requirements The requirements of your application are key when selecting suitable VFD. If you check the websites of leading medium voltage VFD manufacturers you will find several products with different performance data. Read more…
How to choose a medium voltage VFD (Part 1: Introduction) We start a new series dedicated to the selection of medium voltage variable frequency drive. Some points might also be valid for low voltage VFDs. However, many topics require different Read more…
Reliability and availability (Part 4: IGCT based converters) IGCT is a power semiconductor used in medium voltage converter applications. The abbreviation stands for Integrated gate-commutated thyristor. Unlike classical thyristor that can only be switched on, IGCT can be switched on Read more…
What challenges you face when dealing with Variable Speed Drive Systems? Variable speed drive systems (VSDS) represent complex systems requiring expertise in power electronics, electric motors and transformers, control engineering etc. Moreover, interactions between VSDS and electric grid on one Read more…
Reliability and availability (Part 3: Semiconductor redundancy) Today we gonna talk about N+1 semiconductor redundancy. When is it needed? What are the benefits and drawbacks? The main purpose of redundancy is to increase reliability and availaibility of a system. Therefore, Read more…