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 also decided to electrify the bus lines gradually. And they 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 2022, two years after the start of the global pandemic, 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 days, there are specific design features and accessories or options 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 a better choice? Nowadays there are multiple approaches how to 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 transformers. But no matter how reliable a certain device is, 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 something to offer for less dynamic applications as well. In 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 according IEC 60076 standard. This transformer is supplied from 110 Read more…