Energy saving assessment for a drive system Variable frequency drives (VFD) often allow considerable energy savings for the end user. We have previously shared case studies on variable speed fans [1] and variable speed pumps [2]. Resulting payback time can be 2 to 3 years. Despite this known advantage of Read more…
VFD transformers: Your questions The articles from VFD transformers [1] series belong to the most frequently read posts in our blog. It seems that many visitors find us through internet search using keywords such as “converter duty transformer”, “24 pulse drive phase shift”, “extended delta transformer”, “12-pulse phase-shifting transformer”, “three Read more…
Overvoltage protection of transformers This is the continuation of [1] that made an introduction into protection of VFD transformers. The focus of this article is on overvoltage protection. Particular attention is paid to very fast transient overvoltages caused by switching of vacuum circuit breakers. Keep reading to learn about the Read more…
High altitude Majority of variable frequency drive (VFD) systems is installed at altitudes below 1’000 meters above sea level (masl). In such cases no additional considerations due to installation height apply. However, there are sites located at high altitudes. How does it impact the VFD and other drive components? What Read more…
Volvo FL Electric E-mobility is since a while not just a domain of electric cars. Manufacturers of buses and trucks also develop the electric variants of their vehicles and bring them to the market. Volvo Trucks [1, 2], the world second largest manufacturer of heavy-duty trucks, brought its FL Electric Read more…