It is time to evaluate the energy and cost saving potential of VFD! We all read and hear it in the news daily now: The electricity and gas prices are going up sharply. Some people even talk about “energy crisis”. Read more
TGV high-speed train celebrates 40 years European high-speed champion Need for speed was a popular computer game when I was a young boy. When talking about high-speed champions in railway world TGV is the train that surely comes to our Read more
Arc resistant design:Introduction Personal safety stands on the top of agenda of many companies. When talking about medium voltage electric compartments then arc fault is one of the main concerns. Uncontrolled electric arc may have devastating impact on the personnel Read more
DC component in VFD transformers Certain VFD topologies may generate direct current (DC) component on the grid side. There is a general concern about how such DC component affects the performance of the VFD transformer. In this post we discuss Read more
Hydro power plant Slapy (CZ) In this article we invite you to discover hydro power plant Slapy in Czech Republic – the first large construction of Vltava cascade after world war II. Slapy is situated in Central Bohemia, approx. 25 Read more
Skoda 9Tr: Impressions from a ride In this post we would like to share some expressions from the ride with historical trolleybus Skoda 9Tr (spelled ŠKODA 9Tr in Czech with a special character above “S” pronounced “sh”). It took place Read more
How strong is a strong grid? When evaluating the impact of a VFD on the electric grid, particularly the harmonic distortion, we often talk about “strong grid” or “weak grid”. These terms may be a bit vague or at least Read more
What is the right strategy to retrofit fix-speed motor into VFD operation? As addressed in our previous post, a retrofit of a direct on-line (DOL) machine into VFD duty may be a very attractive choice [1]. This post focuses a Read more
Purpose of electrostatic shield What is the electrostatic shield and why is it actually used? This article briefly explains the purpose of electrostatic shield in VFD input transformers [1]. First note that there are several terms being used for what Read more
Benefits of transformer rental service Transformer rental aims to maximize the availability of drive system and reduce the cost impact as much as possible. In this post we will briefly describe the benefits of transformer rental service. Reliability of transformers Read more