Network harmonics: Software tools In order to analyze complex networks with multiple elements and various configurations of the grid a sophisticated software tool is unavoidable. Luckily, there are several good products available on the market. In this article we look Read more
Load types and characteristics Type of load is relevant for VFD hardware dimensioning and selection of most suitable VFD topology [1]. Sometimes the load type determines what kind of rectifier (front end) is required. Also, load type may affect some Read more
VFD catalog rating You have surely noticed that most manufacturers have catalogs and brochures with tables listing their VFD types along with basic information such as rated output current, motor shaft power, cooling requirements, enclosure type, dimensions, weight etc. What Read more
Pumped storage hydro power plants: Intro This article is an introduction into pumped storage hydro power plants. The aim is to explain the purpose and functionality of such sources of electric energy. What is the reason that pumped storage power Read more
Long motor cables Today we gonna talk about long motor cables and their impact on drive systems. In some projects the physical distance between VFD and motor as well as cable routing cause motor cables to be fairly long. This Read more
Photo contest We are sure that there are brilliant photographers among our readers. Therefore, we decided to organize a small photo contest. Yeahh! Do you have any interesting photo regarding variable frequency drives, motors or transformers to share with us? Read more
Current source and voltage source inverter Current source and voltage source inverter are the two basic types of indirect frequency converters. Therefore, it might be very interesting to describe and compare both types. This article can also be seen as Read more
LCI versus VSI:60 MW case study Introduction In this post we share some results of a case study comparing load-commutated inverter (LCI) and voltage source inverter (VSI) for a 60 MW variable speed drive system. Due to confidentiality some quantities Read more
Dry type transformer technologies Transformers can be classified based on their insulation system in two major groups: liquid filled and dry type. Liquid filled (immersed) use either mineral oil or some alternative type of insulation liquid (silicon oil or esters). Read more
Dream VFD You may think that the title of this article – dream VFD – does not sound very serious. However, let us elaborate on the topic a bit. It actually is a serious question: How does your dream VFD Read more