Converter duty transformers / rectifier duty transformers / VFD transformers – these are all synonyms for transformer supplying power electronic based converters. What is so special about these animals? How do they differ from a normal distribution or power transformer? How to protect these transformers and maximize their reliability?
309 days on site! 309 days…that is exactly how long our rental transformer was on site. This example illustrates the importance of a backup solution when you experience fault of a VFD transformer. It was the beginning of December 2021 when we received an inquiry to rent a drive transformer. Read more…
How to take oil samples properly? In this short blog post we share a basic guideline and set of recommendations how to take oil samples properly. Introduction Analyzing the quality of transformer insulation oil by means of oil samples is a standard practice used for decades. Important is to keep Read more…
Success story on transformer rental for critically important compressor drive End of last year our company had the opportunity to rent the VFD transformer to support an important European production plant of a global chemical company. This case has proven our capital spare transformer concept. Learn our success story on 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…
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…
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…
Top 5 manufacturers of converter transformers Lists with top x products / brands / holiday destinations / restaurants / hotels etc are extremely popular. Today we would like to present a list of top 5 manufacturers of converter transformers. As every such list, the ranking is always somewhat subjective or Read more…
What information belongs on a nameplate? Nameplate or rating plate is an inherent part of each drive system component, such as the transformer, variable frequency drive (VFD), electric motor etc. Therefore, it makes sense to spend few paragraphs on the topic. This post explains the content of information on a Read more…
Capital spare transformer – A valuable asset in times of disrupted supply chain Capital spare transformer is very important element to support high availability of a medium voltage variable speed drive system (MV VSDS). While this has always been true this service became even more crucial in today’s world paralyzed Read more…
How does a Buchholz relay work? Buchholz relay belongs to ‘standard’ protection elements of liquid-immersed power transformers including special designs such as converter duty transformers. The simple gas-actuated relay is so popular and reliable that even after development of sophisticated numerical protection relays no one has yet dared to remove Read more…