How to measure VFD efficiency Energy efficiency is high on the agenda. VFDs are enablers on higher efficiency in drive systems, especially in flow control. However, how to deal with VFD efficiency? In particular, how to measure VFD efficiency and Read more
VFD efficiency over 100%: A discovery of a perpetuum mobile? April 1, 2022 Variable frequency drives (VFD) help to save energy on a system level. Also on component level the VFD has very high efficiency. But could the VFD efficiency Read more
Electric buses in Brugg: Powered by the sun! Brugg region is another location in Switzerland that starts utilizing electric buses. We have recently reported about the line 5 in Baden which is a great success so far. Postauto in Brugg Read more
Electropolis Mulhouse Our today’s excursion leads us to the French city of Mulhouse. The city offers several museums and exhibitions (not suprisingly called ‘city of museums’). For us the most attractive one is obviously the EDF museum Electropolis. In spring Read more
Transformer design and cost drivers Right now the transformer prices are just sky rocketing. So talking about transformer cost drivers may be like bringing wood to the forest. However, we hope that the world turns normal again. Then, in normal Read more
Active filter or AFE drive – What is a better option? When taking care of grid harmonics there are several technical solutions to choose from. You might stand in front of a dilemma: active filter or AFE drive? What is Read more
Root cause of VFD transfomer failures Before we dive into the topic let us stress the fact that transformers belong to very reliable electric equipment and their failure rate is very low. This statement is generally valid also for VFD Read more
How does DTC contribute to superior energy efficiency? Direct Torque Control (DTC) is well-known for its superior dynamic performance. Therefore, it is successfully used in applications requiring rapid change of torque in the range of few milliseconds. However, DTC has Read more
75 MVA converter duty transformer After publishing several theoretical articles on VFD duty transformers it is time to have a closer look at some real designs. In today’s post we present a brilliant example: 75 MVA converter duty transformer designed Read more
Solidarity with Ukraine Ukraine, a sovereign European country, has been attacked and invaded by the army of Russian Federation. Something we could hardly imagine in civilized Europe of 21st century. Our blog has been fully dedicated to topics related to Read more